DECAPODS 33 



Type locality. Gulf of California, in Concepcion Bay, Lower Calif., 

 two $ (Albatross], 



Distribution. Also taken at San Diego Bay, California, 3 fathoms 

 (Albatross station 3567) ; Gulf of California, off San Josef Island, Lower 

 California, 8 fathoms, station 3006; Guaymas, Mexico, inner harbor 

 (P. L. Jouy, collector). One lot without label was associated with Crangon 

 nigromaculata Lockington. 



Relations. This species, while having the general appearance of U. 

 longicaudata, is markedly different : U. longicaudata has no antennal spine 

 on the carapace ; U. infraspinis has a distinct ocellus outside the cornea, 

 U. longicaudata has not; in U. infraspinis the palm and fingers of the 

 first pair are subequal; in U. longicaudata the palm is longer than the 

 fingers; in U. infraspinis the carpus of the second pair is subequal to 

 the merus, the palm is a little shorter, and the fingers still shorter ; in U. 

 longicaudata the carpus, palm, and fingers are subequal to one another 

 and shorter than the merus; in our species the sixth abdominal somite 

 is shorter than the carapace, and less than twice as long as the fifth ; in 

 U. longicaudata the sixth segment is as long as the carapace (rostrum 

 excluded) and twice as long as the fifth. 



Family PONTONIID^E. 

 Genus Pontonia Latreille. 



PONTONIA CALIFORNIENSIS Rathbun. 

 Pontonia calif orniensis RATHBUN, Proc. U. S. Nat. Mus., xxiv, 902, 1902. 



The carapace and rostrum exceed in length the first six segments of 

 the abdomen. Rostrum more than one third the length of the re- 

 mainder of the carapace, very narrow throughout, deflexed, reaching to 

 the middle of the second segment of the antennular peduncle. A tooth 

 on the anterior margin just above the base of the antenna. The eyes 

 reach to the middle of the first antennular segment. The lateral expan- 

 sion of this segment is broad behind and narrow in front, terminating in 

 a short spine at the anterior angle ; second segment one and a half times 

 as long as third, both together half as long as first. Scale about two fifths 

 as long as carapace, scarcely exceeding the antennular peduncle, the 

 spine of the scale about as produced as the blade. Antennal peduncle 

 reaching to end of scale. 



Feet of first pair extending beyond the scale by the length of the 

 propodus and nearly the whole of the carpus ; merus and carpus subequal 

 and each twice the ischium ; propodus a little shorter than carpus ; palm 



