CALIFORNIA STALK-EYED CRUSTACEA. 69 



constitutes the genus Cheiragonus (or Cheiragone) , Tele- 

 messus has priority. According to the A. 0. U. code, 

 Cheiragone must be considered a " nomen nudum J^ 



Telemessus cheiragonus (Tilesius). 0~) 



Cancer cheiragonus Tilesius, Mem. Acad. St. Petersbourg, T. V, 1815, p. 



347, PL VII, fig. 1. 

 Tellmessus serratus White, Aun. Nat. Hist., Vol. XVII, 1846, p. 497; Voy- 

 age of Samarang, Crustacea, 1848, p. 14. Dana, Crust. U. S. Expl. 



Expd., Part I, 1852, p. 303, PI. XVIII, fig. 8. Smith, Rep. Prog. Geol. 



Sur. Canada, 1878-9, B, p. 208. 

 Platycorystes ambiguus Brandt, Bull. Phys-math. Acad. St. Petersbourg, 



T. VII. 1848, p. 179. 

 Platycorystes cheiragonus Brandt, Middendorff's Siberische Reise, Bd. II, 



Th. 1, 1851, p. 85. 

 Cheiragonus hippocarcinoides Brandt, Middendorff's Siberische Reise, Bd. 



II, Th. 1, 1851, p. 147. Stimpson, Journ. Bost. Soc. Nat. Hist., Vol. 



VI, 1857, p. 465. 

 Telemessus serratus and T. cheiragonus Miers, Proc. Zool. Soc. London, 



1879, p. 36. 

 Telemessus cheiragonus Benedict, Proc. U. S. Nat. Mus., Vol. XV, 1892, 



p. 224, Pis. XXXV and XXXVI, figs. 2, 3 and 4. Newcombe, Bull. 



Nat. Hist. Soc. Brit. Col., 1893, p. 24. Walker, Trans. Liverpool 



Biol. Soc, Vol. XII, 1898, p. 373. 

 Cheiragonus cheiragonus Ortmann, Zool. Jahrb. Abth. f. Syst., Bd. VII, 



1894, p. 420. 



Carapace depressed, areolated, furnished with granules and thickly cov- 

 ered peculiar clavate sette. The teeth of the median lobe of the front are 

 triangular, subequal, and extend forward to about the same distance. The 

 preorbital teeth are large and acute and the rounded sinus between them 

 and the median frontal lobe is armed with secondary teeth. Postorbital 

 tooth acute. The margins of the orbit are denticulated and the upper 

 margin is furnished with two small ffssures; lower margin entire but 

 deeply concave. Lobe of the basal antennal joint triangular. Merus of 

 the chelipeds spiny; two rows of spines on the upper edge of the hand 

 (the outer row may be reduced to tubercles) and below these four rows of 

 spines or tubercles on the outer surface. Legs furnished with transverse, 

 setose, granulated or, in some cases, spinous lines; dactyls strongly 

 grooved, longer than the propodi. The abdomen of the male is abruptly 

 contracted behind the third segment, a small part of the posterior margin 

 of which projects nearly transversely. The antero-lateral margin of the 



