576 CALIFORNIA ACADEMY OF SCIENCES. 



Suborder MACROURA. 



Family HIPPOLYTID^. 

 HiPPOLYTE CALIFORNIENSIS Sp. nOV. 



A long, slender species. Rostrum slightly longer than 

 the carapax, slender, nearly horizontal, very slightly up- 

 turned, tapering uniformly to the tip; on the upper mar- 

 gin it is armed with three to five low, acute teeth, the 

 points of which are directed forwards and slightly up- 

 wards; on the lower margin there are four or five similar 

 teeth, the last one being so near the tip of the rostrum as 

 to give it the appearance of being bifid. The base of the 

 rostrum is rounded above and there is a spine on either 

 side of it above and behind the ocular peduncles. On 

 the upper part of the anterior margin of the carapax is a 

 tooth below which is an acute spine. There is a convex- 

 ity but no spine at the lower angle of the margin, but 

 there is a prominent spine within the margin behind the 

 base of the second antenna?. 



Peduncle of the first antenna? about one-half as long as 

 the rostrum, the spine at the outer side of the base flat- 

 tened and about two-thirds as long as the first joint which 

 is much depressed and has the inferior inner margin pro- 

 duced and furnished with a spine. Outer flagellum not 

 reaching the tip of the rostrum, much shorter than the 

 slender inner flagellum, the last few joints much more 

 slender than the preceding ones. 



The second antenna? may equal the length of the body: 

 the scale is narrow and nearW reaches the tip of the ros- 

 trum in some cases. 



The apical plate (psalistoma) of the mandibles is very 

 slender, flexible, and bears five or six teeth at the tip. 



The third maxillipeds are slender and short, not reach- 

 ing the tip of the peduncle of the second antenna?; the 



