236 CALIFORNIA ACADEMY OF SCIENCES. 



larger in lamellicornis than in spinus, and the rostrum 

 is also larger. The chief difference, however, between 

 the two species seems to be in the dactyls of the ambu- 

 latory legs; in spinus they are rather stout and strongly 

 spiny below, while in lamellicornis they are more slender 

 and nearly devoid of spines, having only a few minute 

 spinules near the base. 



Spirontocaris groenlandica (Fabr.) 



Astacus groenlandicus Fabricius, Syst. Eut., 1775, p. 416. 



Hippolyte groenlandica Miers, Anu. Nat. Hist. (4), Vol. XX, 1877, p. 62. 



Smith, Eep. Prog. Geol. Sur. Canada, 1878-9, B, p. 214; Trans. Conn. 



Acad. Sci., Vol. V, 1880, p. 85, PI. X, fig. 2. Calman, Ann. N. Y. 



Acad. Sci., Vol. XI, 1898, p. 260. 

 Spirontocaris groenlandica Walker, Trans. Liverpool Biol. Soc, Vol. XII, 



1898, p. 276. 



This species, which has previously been mentioned as 

 having been reported by Professor S. I. Smith from 

 Queen Charlotte's Islands, has been found both by Walker 

 and by Caiman to occur in Puget Sound. The carina 

 on the carapace extends about to the posterior margin 

 and is armed with four large teeth; the rostrum is short 

 and very slender, scarcely higher than wide, and pro- 

 jects nearly straight in front, the upper margin is armed 

 with from two to four spines, the lower with two or three. 

 Maxillipeds robust, exceeding the acicle. Anterior 

 chelipeds stoat. Ambulatory legs rather stout, spiny, 

 the dactyls short and spiny below. Sides of the seg- 

 ments of the abdomen acute. 



I have not seen western representatives of this species. 



Miss M. J. Rathbun has recently made Lophoxanthus 

 bellus (Stimpson) the type of a new genus Lophopano- 

 peus,^ in which are included also Lophoxanthus leuco- 

 manus (Lockington) and L. frontalis (Rathbun). In 



1 Bull. Lab. Nat. Hist. State Univ. Iowa, 1898, p. 272. 



