NO. 3652 ISOPODA AND TANAIDACEA—MILLER 13 
roma oregonensis, subsequently has been placed in Ezosphaeroma, 
Neosphaeroma, and currently, since Menzies (1954), in Gnorimo- 
sphaeroma. Menzies subdivided it into two subspecies, G. oregonensis 
oregonensis and G. o. lutea, but Riegel (1959) on the basis of mor- 
phological, physiological, and ecological evidence elevated the two 
subspecies to full species status. 
Menzies states that G. oregonensis oregonensis ranges from Alaska 
to San Francisco Bay, Calif., with the type-locality in Puget Sound, 
Wash. He lists many records of distribution in this range. It 
occurs primarily in the intertidal zone to depths of 12 fathoms (20.8 
meters) but has been taken at submerged night lights near the surface 
(Hatch, 1947; Menzies, 1954). It apparently tolerates in nature 
a wide range of salinities, as it was found on buoys in the upper reaches 
of San Francisco Bay (Suisun Bay, etc.) near the Sacramento-San 
Joaquin delta where salinities are low (oligohaline) and on buoys 
outside the bay and on the open seacoast outside the Golden Gate 
and along the coast of Washington. 
Group Eubranchiatae 
Paracerceis caudata (Say) Hansen 
FIGuRE 3 
Locatrtr1es.—North Carolina: Cape Lookout region (Stations 34, 
35). Florida: Port Everglades (Station 38), Florida Keys (Stations 
39-41, 44, 47, 48), Sarasota (Station 49), Tampa Bay (Station 50). 
Bahamas: Walker Cay (Station 62). 
Remarks.—Richardson (1905b) records many localities for Para- 
cerceis caudata (under the name Cilicaea caudata) ranging from Egg 
Harbor, N.J., southward to the Florida Keys, the Bahamas, Porto 
Rico, Yucatan, and the Bermudas. Reported depths are from the 
surface to 25 fathoms (46 meters) among algae and grass and from 
coral reefs. The buoy collections of this species are well within its 
previously recorded geographic and depth range. It appears to be 
predominantly a warm water species of the eastern North American 
coast. 
Pronounced sexual dimorphism in this species results in taxonomic 
difficulty unless samples include mature males. Females alone are 
notoriously difficult to identify correctly and even have been de- 
scribed as distinct species (e.g., Dynamene bermudensis represents the 
female of Paracerceis caudata). Small females of Paracerceis caudata 
in the buoy collection, especially one from Satan Shoal Buoy (Station 
39) near Key West, resemble the description of Dynamene angulata 
Richardson (1901). The latter was described only from female speci- 
mens found by Mr. Henry Hemphill at No Name Key, Fla. It has 
