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CALIFORNIA STALK-EYED CRUSTACEA. 161 



Callianassa longimana St. ^ 



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

 1857, p. 86; Jouru. 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. /9. A. 

 Milne-Edwards, Nouv. Archiv. Hist. Nat. Paris, Tome 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. 

 Antennas 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; oater 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 calif or- 

 niensis. Telson with an obtuse emargmation 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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