THE SPIDER CRABS OF AMERICA 133 



Young : Spines of young male longer than of young female. Post- 

 orbital tooth less extensive and less curved than in the adult, as is 

 also the case in cuspidata; in the carapace of the smallest arachna, 

 12.5 mm. long, the tooth is curved and directed obliquely outward. 

 The proximal spine on the merus of the legs is present in all sizes 

 though it is very short, almost tuberculiform, in the smallest. 



Measurements. ^Male, holotype (18144), length of carapace 45, 

 width without spines 35 mm. 



Range. — Off South Carolina; E. part of Gulf of Mexico. Depth, 

 111 to 210 fathoms. 



Material examined. — See table, page 128. 



PYROMAIA TUBERCULATA (Lockington) 



Plate 40, fig. 3; plate 218, figs. 1-4 



Inachus tuberculatus Lockington, Proc. California Acad. Sci., vol. 7, 1876 

 (1877), p. 30 [3] (type-locality, mouth of San Diego Bay, 8 fathoms; type 

 not extant). 



Microrhynchus (Inachus) tuberculatus Lockington, Proc. California Acad. 

 Sci., vol. 7, 1876 (1877), p. 64 [2]. 



? Inachoides brevirostrum Lockington, Proc. California Acad. Sci., vol. 7, 

 1876 (1877), p. 75 [13] (type-locality, Magdalena Bay, L. C, 3 fathoms; 

 type not extant). 



? Inachodes brevirostrum Streets and Kingsley, Bull. Essex Inst., vol. 9, 

 1877, p. 105. 



Inachoides magdalenensis Rathbun, Proc. U. S. Nat. Mus., vol. 16, 1893, p. 

 228 (type-locality, off Santa Margarita Island, Lower California; type, 

 Cat. No. 17337, U.S.N.M.); Harriman Alaska Exped., vol. 10, 1904, p. 171. 



Neorhynchus mexicanus Rathbun, Proc. U. S. Nat. Mus., vol. 16, 1893, p. 

 233 (type-locality. Gulf of California, station 3030; type, Cat. No. 17350, 

 U.S.N.M.). 



Dasygyius tuberculatus Rathbun, Proc. U. S. Nat. Mus., vol. 21, 1898, p. 570; 

 Harriman Alaska Exped., vol. 10, 1904, p. 172, pi. 10, figs. 3 and 3a, text- 

 fig. 92. — Holmes, Occas. Papers California Acad. Sci., vol. 7, 1900, p. 

 27.— Weymouth, Stanford Univ. Publ., Univ. Ser. No. 4, 1910, p. 27, 

 pi. 3, fig. 8. 



Inachoides tuberculatus Schmitt, Univ. California Publ. ZooL, vol. 23, 1921, 

 p. 199, text-fig. 123. 



Diagnosis. — Carapace of typical form with three enlarged median 

 tubercles or spines. Antennal spines incurved at tip. Manus of 

 male cheliped subglobular. Dactyls of legs unarmed in adult, 

 spinulous in young. 



Description. — Adult male: Carapace broadly pyi'iform and finely 

 pubescent; elevated portions granulate and tuberculate, with a 

 larger tubercle, often spiniform, on the mesogastric, cardiac and 

 intestinal regions and sometimes on the summit of the branchial 

 regions. There is also a short spiniform tubercle pointing upward 

 and backward on the first segment of the abdomen. Rostrum of 

 variable length, from just as long to one and a third times as long as 



