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Date of Award


Document Type


Degree Name

Master of Science (M.S.)


Biological Sciences

First Advisor

Fuad M. Nahhas


The present paper deals with the digenetic trematodes collected by the author from fishes of Tomales Bay (including Dillon Beach) during the summers of 1967 and 1968. Also included in this study are several trematodes collected by the late Alden E. Noble (hereinafter referred to as the “Noble Collection”) at Hopkins Marine Station, Monterey Bay in 1936 and 1937. Unfortunately the majority of the slides in the “Noble Collection” have been lost with the exception of specimens of the Family Meniuridae and a few representatives of other digenea that were in the personal collection of Dr. F.M. Nahhas. A few vials containing unprocessed material were also still available but their contents were in poor condition as evidenced by the stained material prepared from them.

The records for the “Noble Collection” were intact and various notations were included in the descriptions of these species. These records show an original collection consisting of 170 individuals representing 69 species of fishes. Twenty species represented by 27 fishes were negative for digenetic trematodes, and of the remaining 49, slides of trematodes were found that were obtained from but 25 species.

The Tomales Bay material consisted of 495 individual fishes representing 33 species. Of these, 11 species represented by 35 individuals were negative for digenea. Four species of fish that barbored trematodes were common to both localities.



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