The morphology and taxonomic use of the reproductive tracts of some of the Pacific Northwest Pulmonates were studied. The snails examined were, Monadenia fidelis (Gray), Vespericola columbiana (Lea), Allogona townsendiana (Lea), Haplotrema sportella (Gould), and Haplotrema vancouverense (Lea). The length of the reproductive tracts of nine or more individuals of...
The fish of Suttle Lake, Oregon, have been found to harbor
an acanthocephalan parasite, which lives attached to the mucosa of
the intestine. Between July 1961 and January 1963, several hundred of
these fish were exarnined and nearly every one was infected
with this parasite, which was identified as Neochinorhynchus...
The Tailed Frog Ascaphus truei, the only species in the
family Ascaphidae found outside New Zealand, is a common inhabitant
of the mountain streams of the Northwestern United States and
British Columbia. The anatomical peculiarities of this primitive
anuran have been investigated, but no literature is available on the
digenetic...
Cardicola alseae is a blood dwelling trematode found in the
fishes Salmo clarki henshawi and Salmo gairdneri gairdneri. Eggs
which were ovoid in shape and non-operculate left the adult and passed
to the gill capillaries of the secondary lamellae. The miracidium was
ovoid, 0.070 mm. long by 0.052 mm. wide,...
Gonatus fabricii (Lichtenstein, 1818), G. magister Berry,
1913, G. anonychus Pearcy and Voss, 1963, and Gonatopsis borealis
Sasaki, 1923 (Gonatidae) are squid forming a major portion of the
cephalopod fauna found off the Oregon coast. A study was undertaken
to determine the morphological differences among the four species
of squid....
The cuticle of the cercaria of Acanthatrium oregonense was
studied by means of electron microscopy and histochemistry. The
integument of this cercaria has a definite ultrastructure which
varies in different regions of the body. The body cuticle is a
syncytium containing vesicles and mitochondria. It is bounded
externally by a...
The 13 species of shrimps studied for this thesis were collected
off the Oregon coast. The family Oplophoridae is well represented
in this area. Five of the seven known genera were identified.
Hymenodora frontalis, H. glacialis, and H. gracilis were described
and further differentiating characters were illustrated. Other members
of...
The histopathological and histochemical effects on the snail
Oxytrema siliqua, caused by the larvae of Nanophyetus salmincola,
have been studied. The parasite causes damage to the organ by increased
pressure, active ingestion of the hepatic tubules, and by
the increased burden placed upon the snail in disposing of the waste...
Four species of sponge from the coasts of Oregon and Washington
were studied and dissected for inhabitants and associates.
All four species differed in texture, composition, and habitat, and
likewise, the populations of associates of each species differed,
even when samples of two of these species were found adjacent to...
The host fish for this study were collected from January
through June of 1965. Tidepools were selected at Bar View, Cape
Arago, Neptune State Park, Seal Rock, and Yaquina Head. Of the
187 fish examined, 132 were infected. The following host fishes
yielded the following parasites. New Host records are...
The female Philometra americana Ekbaum, 1933 is a common
subcutaneous parasite of the starry flounder, Platichthyes stellatus (Pallas) of Yaquina Bay, Lincoln County, Oregon. Maturation of this
worm produces noticeable red cysts subcutaneously between the fin
and tail rays and similarly on the operculum. The gravid female
penetrates the epidermis...
The anemone Anthopleura xanthogrammica varies in color from
bright green to muddy brown. However, individuals found in caves
are white. White specimens of Anthopleura xanthogrammica collected
from dark caves along the Oregon coast were subjected to various
experiments to determine if these cave dwelling animals carried any
cells of the...