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. /ongicaudata has no antennal spine 
on the carapace; UV. 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. Jongicaudata 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 PONTONIIDA. 
Genus Pontonia Latreille. 
PONTONIA CALIFORNIENSIS Rathbun. 
Pontonia californiensis 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 
