582 CALIFORNIA ACADEMY OF SCIENCES. 



Suborder SCHIZOPODA. 



Family MYSID.^. 



Callomysis gen. nov. 



Carapax having a deep posterior sinus which leaves a 

 portion of the pereon uncovered. Rostrum short. E3^es 

 normal. i\ntennules with a setose lobe at the base of the 

 outer flagellum ; the sensory appendage usually found in 

 the males of schizopods is absent. Antennal scale ob- 

 long, truncated, and ciliated on the inner and distal mar- 

 gins; outer margin naked and terminating in a spine. 

 The gnathopods resemble the maxillipeds but have a 

 larger endopod. The distal portion of the thoracic legs 

 is divided into numerous articulations. Pleopods in the 

 female rudimentary and biramous, the outer ramus smaller 

 than the inner one. In the male the pleopods are small, 

 biramous, the outer ramus of the third pair elongated; 

 the fourth and fifth pairs short. Inner ramus of the uro- 

 pods furnished with the usual auditory apparatus. Tel- 

 son well developed, the margins spinous, the tip provided 

 with an emargination in which are situated several spines. 

 Marsupial pouch formed by two pairs of large lamellae 

 and a rudimentary third pair. 



Callomysis maculata sp. nov. 



General form rather slender. Carapax not one-half as 

 long as the abdomen, with broadly rounded antero-lateral 

 and postero- lateral angles. Rostrum short, subtriangu- 

 lar. Abdomen subcylindrical, slightly tapering, the pos- 

 terior segment the longest. Ocular peduncles pyriform ; 

 cornea subhemispherical. The antennular peduncles are 

 moderately stout, the first and third joints oblong (the 

 third shorter than the first), the second joint a little 

 broader than long; the outer flagellum is considerably 

 longer than the inner one but shorter than the body and 



