CALIFORNIA STALK-EYED CRUSTACEA. 125 



Cryptolithodes sitchensis Brandt. 



Cryptolithodes sitchensis BRANDT, Bull, phys.-math. Acad. imp. sci. St. 



Petersb., Tome XI, 1853, p. 133; Melanges biologiques, Tome I, p. 



654. STIMPSON, Journ. Bost. Soc. Nat. Hist., Vol. VI, 1857, p. 476 ; 



Proc. Acad. Nat. Sci. Phila., 1858, p. 231. NEWCOMBE, Bull. Nat. 



Hist. Soc. Brit. Col., 1893, p. 26, PI. XI. BOUVIER, Ann. Sci. Nat. (7), 



Tome XVIII, 1895, p. 189, PI. XI, figs. 11 and 15, PI. XII, fig. 26; 



Ibid. (8), Tome I, 1896, p. 28. 

 Cryptolithodes alta-fissura BATE, Proc. Zool. Soc. London, 1864, p. 665; 



Ann. Nat. Hist. (3), Vol. XV, p. 485; in Lord's Nat. in Vancouver's 



Is., VoK II, 1866, p. 271. 



Carapace transversely subelliptical; median region high and surmounted 

 by a ridge or crest, which extends to the middle of the front anteriorly; a 

 pair of transverse ridges extending upon the hepatic region from the sides 

 of the median elevation. Behind the median region the carapace is nmch 

 inflated and rounded and furnished with a rounded elevation behind the 

 depression at the posterior end of the median area. Median ridge obsoles- 

 cent on the posterior portion of the carapace. Surface of the carapace 

 smooth, microscopically very closely punctated, and furnished here and 

 there with very small, rounded tubercles which, in some specimens, are 

 almost entirely absent. The rostrum is deflexed at an angle of about 45 

 degrees and widened towards the distal end, which is transverse and fur- 

 nished with a small median tooth. The lateral expansions of the carapace 

 are produced forwards to about two-thirds the length of the front, forming 

 a large deep, rounded, orbital sinus on either side. Theantero-lateral mar- 

 gins are strongly arcuated, curving most sharply a little in front of the 

 middle, the posterior third being almost straight and much more nearly 

 longitudinal than transverse; the antero-lateral teeth are eight to ten in 

 number and separated by concave interspaces of variable length; they are 

 small and variable, often subacute, but sometimes represented by small 

 undulations. The lateral angles of the carapace much exceed 90 degrees, 

 and the lateral teeth are larger than those in front. Posterior margin 

 strongly arched, and generally devoid of teeth, although there may be one 

 or two small ones near the lateral angles. A very prominent longitudinal 

 crest on the pterygostomian regions. The ocular peduncles are smooth, 

 bent upwards, and flattened above, the bases much enlarged. The superior 

 crest on the second joint of the antennae is short and high and the lami- 

 nate outer process is triangular, produced at the postero-external angle, 

 and extending forward in a sharp point considerably exceeding the fourth 

 joint of the peduncle; the fifth joint is strongly compressed, having a 

 high, thin crest on the upper side, which is produced at the distal end; 

 flagellum nearly naked, scarcely as long as the peduncle; the acicle is very 



