152 U.S. NATIONAL MUSEUM BULLETIN 2,5 8 



Ischyroceridae 



Ischyrocerus anguipes (Kr0yer) 



Figure 37 j-1 



Ischyrocerus anguipes (Kr0yer) : Sars, 1895, pp. 588-589, pi. 209. — Gurjanova, 

 1951, pp. 915-916, fig. 634.— J. L. Barnard, 1954a, p. 35, pis. 32, 33. 



The only adult specimens at hand are those from Bodega Bay. 

 They differ from Sars' figures only in the slight bilobation of the 

 second gnathopodal palmar process on terminal adult males; several 

 variations of the outer ramus of uropod 3 are shown in the figures; 

 however, most of the specimens have only 3 large, blunt denticles 

 on the outer ramus of uropod 3, as shown by Sars. 



Material^ — bodega bay, Horseshoe Cove, Oct. 8, 1963, 100 + 

 specimens collected by Mr. Robert Sikora, University of California 

 at Berkeley, carmel: algal holdfasts, scarce; Phyllospadix roots be- 

 low water, scarce; Macrocystis stipe, rare; tunicates and sponges, 

 scarce, cayucos: Amaroucium sp., abundant, hazard canyon: 

 coralline algae on sandy holes, rare. 



Distribution. — A boreal northeastern Atlantic species, recorded 

 in the eastern Pacific Ocean from Oregon south to Hazard Canyon 

 Reef, California. 



Ischyrocerus species A and B 



Figures 36, 37 a-i 



Two species of Ischyrocerus, neither identifiable with Microjassa 

 litotes J. L. Barnard or /. anguipes (Kr0yer), occur in sufficient num- 

 bers in the Californian intertidal to warrant some recognition at this 

 time. Primarily they occur as juveniles or females, occasionally with 

 a subadult male specimen scarcely differentiated from females. No 

 male is sufficiently adult to permit nomenclatural fixation. Presumably 

 adults of these species live below the intertidal zone or in some habitat 

 not explored in this survey. 



Ischyrocerus sp. A is a thin-bodied species somewhat similar to the 

 thin form of Jassa jalcata (see below) ; its third uropod is difficult to 

 separate from that of I. anguipes as the denticles on the outer rami 

 of both taxa are large, but in Ischyrocerus sp. A they usually exceed 

 3 in number and occur in 2 parallel rows. Unlike Iscyhrocerus anguipes 

 the eyes of Ischyrocerus sp. A are very small, even if the transparent 

 peripheral ommatidia are included in the eye diameter; the coxae are 

 short in both males and females (see figures) . A male second gnathopod 

 shown herein is sufficiently adult to suggest that of /. anguipes. 



Ischyrocerus sp. B is a thick-bodied species similar to /. anguipes; 

 its eyes are as large as those of /. anguipes and its coxae are long but 

 the small size of the denticles on the outer ramus of uropod 3 are 



