CALIFORNIA STALK-EYED CRUSTACEA. 161 



Callianassa longimana St. 



Callianassa longimana STIMPSON, Proc. Bost. Soc. Nat. Hist., Vol. VI, 

 1857, p. 86; Journ. Bost. Soc. Nat. Hist., Vol. VI, 1857, p. 490, PI. 

 XXI, fig. 5. COOPER, Rep. Expl. and Sur. to Pacific Ocean, Vol. XII, 

 Book 2, 1860, p. 388. BATE, in Lord's Nat. in Vancouver's Is., Vol. 

 II, 1866, p. 279; Challenger Reports, Vol. XXIV, 1888, p. 19. A. 

 MILNE-EDWARDS, Nouv. Archiv. Hist. Nat. Paris, Toine VI, 1870, p. 

 83. LOCKINGTON, Ann. Nat. Hist. (5), Vol. II, 1878, p. 302. 



Rostrum small but subacute, with two small, lateral teeth as in californi- 

 ensis. Ocular peduncles and antennules much as in the preceding species. 

 Antennae about one-half as long as the body. The chelipeds in the adult 

 male are narrower than in calif orniensis; the ischium is of similar shape, 

 with the lower margin finely denticulated and the outer surface more or 

 less scabrous; merus similar to that of calif orniensis, but the upper margin 

 is not convex and the lobe at the base is more prominent; carpus oblong, 

 with the margins subparallel, ciliated, thin, but not produced nearly so 

 much as in calif orniensis; outer surface smooth, glossy, and very convex; 

 hand oblong, longer than the carpus, with thin, ciliated, parallel margins 

 and a smooth, convex, glossy, outer surface; fingers shorter than the 

 palm and furnished with tufts of cilia and not widely gaping when closed; 

 the dactyl is dilated near the base, hooked at the tip, and projects but little 

 beyond the pollex; upper edge and inner surface more or less granulated. 

 The smaller cheliped resembles that of calif orniensis; merus widest near 

 the middle, shorter than the ischium, often having a small tooth near the 

 middle of the lower margin; carpus narrow, much longer than the ischium, 

 convex and glossy on both sides, the margins parallel; hand of the same 

 width as the carpus but scarcely as long; palm longer than broad; fingers 

 long, ciliated and contiguous. The larger cheliped in the female is scarcely 

 distinguishable from that of the female of calif orniensis . The smaller 

 chelipeds are also very similar in the two species, but in longimana the 

 hand and carpus are somewhat narrower. Ambulatory legs as in califor- 

 niensis. Telson with an obtuse emargination at the tip. Uropods distally 

 truncated and slightly exceeding the telson. 



Color whitish. 



Length of a male specimen, 39 mm.; length of large cheliped, 39 mm.; 

 ischium, 8 mm.; merus, 8.5 mm.; carpus, 10.5 mm.; hand, 13.5 mm.; 

 length of small cheliped, 22.5 mm.; carpus, 6.5 mm.; width of same, 2.1 

 mm.; length of merus, 4.2 mm.; hand, 6.2 mm. 



Vancouver's Island (Bate); Shoalwater Bay (Cooper); 



Puget Sound (Stimpson) ; San Francisco Bay! San Pedro! 

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