CALIFORNIA STALK-EYED CRUSTACEA. 65 



Genus Xanthias Ratkbun. 



(Genus Xanthodes DANA, preoc.) 



Carapace transverse, distinctly areolated, more narrow and convex than 

 in the genus Xantho, to which it is very closely allied. Antero-lateral 

 margin not thin-edged or cristiform; teeth tuberculiform or even spinous. 

 Posterior portion of the carapace depressed. Antennules transversely or 

 -obliquely plicated. Basal antennal joint short, and barely reaching the 

 slender, narrow, infero-lateral process of the front, and not produced 

 within the hiatus of the orbit; flagellum not excluded from the orbit. 

 Chelipeds stout, the tips of the fingers acute (not excavated within). 

 Ambulatory legs compressed or subcylindrical and devoid of a crest on 

 the upper margin. Abdomen of the male five- jointed. 



Xanthias Taylori St. 



JKanthodes Taylori STIMPSON, Ann. N. Y. Lye. Nat. Hist., Vol. VII, 1859, 



p. 208, PL III, fig. 3. STREETS and KINGSLEY, Bull. Essex Inst., Vol. 



IX, 1878, p. 105. A. MILNE-EDWARDS, Crust, in Miss. Sci. au Mex., 



Pt. V, p. 260, PI. XLV, fig. 3. 

 Xantho spini-tuberculatus LOCKINGTON, Proc. Cal. Acad. Sci., Vol. VII, 



1877, pp. 31 and 99. 



Carapace flat behind; in front quite strongly convex longitudinally but 

 transversely nearly plane. Areolets distinct and embossed anteriorly; 

 antero-lateral regions strongly lobulated with a prominent, smooth, 

 rounded lobule above each marginal tooth. The lobes of the front arc 

 separated by a wide, rounded notch and furnished with a rounded tooth 

 at the inner and outer angles, between which are several small, baccate 

 protuberances. Closely behind and parallel with the anterior margin of 

 the front is a baccated ridge interrupted in the middle by the prominent 

 longitudinal groove which extends backwards from the median notch. 

 Behind this ridge is another elevation not so distinctly baccated, which is 

 separated by a transverse sulcus from the elevated anterior margins of a 

 pair of lobules lying behind it. Median region divided into three distinct 

 areas. Inner orbital angle prominent and separated by a deep notch from 

 the outer angle of the front. Upper orbital margin with a rounded tooth 

 bounded by a pair of sulci. Postorbital tooth small and continuous 

 externally with a rounded protuberance; the latter is separated by a smooth 

 sulcus from a pair of smooth, rounded prominences, one of which is situ- 

 ated directly above the other. The three posterior teeth on the antero- 

 lateral margin prominent, the last two acute and curved forwards, the first 

 -obtuse and generally more or less bifid. A small tooth usually present 

 .behind the one at the autero-lateral angle. A tooth below the infero- 

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