. Alaska. Natural history -- Alaska; Scientific expeditions; Alaska. DECAPODS 33 Type locality. —QxvM of California, in Concepcion Bay, Lower Calif., two ? [Albatross). Distribution.—Aho 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. longicaiidata, is markedly different: U. longicaudata has
. Alaska. Natural history -- Alaska; Scientific expeditions; Alaska. DECAPODS 33 Type locality. —QxvM of California, in Concepcion Bay, Lower Calif., two ? [Albatross). Distribution.—Aho 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. longicaiidata, is markedly different: U. longicaudata has no antenna! spine on the carapace; U. in/raspinis has a distinct ocellus outside the cornea, U. longicaudata has not; in U. iiifraspinis the palm and fingers of the first pair are subequal; in U. longicajulata the palm is longer than the fingers; in U. in/raspinis the carpus of the second pair is subequal to the menis, 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^. 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
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