1921] Schmitt: The Marine Decapod Crustacea of California 39 
Characters.—Rostrum more than one-third the length of the remainder of 
carapace, very narrow, deflexed. Right foot of second pair missing. Merus of 
left foot short and stout, carpus cup-shaped, palm and fingers subequal in length, 
palm two-thirds as broad as long, fingers gaping, prehensile edges denticulate, 
fringed with long hair. Telson twice as long as sixth somite, with two pairs of 
long lateral, appressed spines inserted on anterior half. 
Dimensions.—Type, female: length of carapace and rostrum 6.7 mm., of 
rostrum 1.8 mm., of abdomen 9 mm. 
Type Locality Off Santa Cruz Island, California, 30 fathoms (‘‘ Albatross’? 
station 2945). 
Remarks.—This is the only Pontonia described from the west coast of North 
America, the P. margarita of Smith being a Conchodytes (Rathbun). 
Genus Periclimenes Costa 
Rostrum long, compressed, usually dentate, in side view diminishing gradually 
to a sharp point at the free end, not bent downward. Thicker flagellum of 
antennules long or moderate, bifid. Antennal scale long, usually narrow. Second 
pair of legs long, slender, and equal. 
Periclimenes tenuipes (Holmes) 
Anchista tenuipes Holmes, Occas. Papers Calif. Acad. Sci., 7, 216, 1900. 
Periclimenes tenuipes Rathbun, H. A. E., 10, 34, fig. 12, 1904; Borradaile, 
Trans. Linn. Soc. London (Zool.), (2), 17, 368, 372, 1917. 
Periclimenes holmesi Nobili, Ann. Mus. Univ. Napoli (N.S.), 2, no. 21, 5, 
1907; Borradaile, ibid., (2), 17, 376, 1917. 
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Fig. 24. Periclimenes tenuipes, X 4; a, lateral view of carapace; b, foot of 
second pair (from Rathbun, U. S. N. M.). 
Characters.—Rostrum about as long as the carapace, rather deep near the 
middle, armed above with six or seven teeth, the last one or two on the carapace; 
lower side armed with three or four teeth; the last dorsal spine is near the anterior 
third of the carapace. A supraorbital, an antennal, and an hepatic spine present; 
anterolateral angle of the carapace rounded and devoid of spines. Ocular peduncles 
large and furnished with an ocellus between the cornea and the proximal part of 
the stalk. Second pair of legs slender and greatly elongated, the carpus reaching 
beyond the rostrum; ischium, merus, and carpus of subequal length; hand long, 
very narrow, subcylindrical, exceeding the length of the carpus and merus com- 
bined; fingers slender, straight, about two-thirds as long as the palm; tips hooked 
and crossed when fingers are closed. Telson with two pairs of dorsal spinules. 
