222 BULLETIN 129, UNITED STATES NATIONAL MUSEUM 



ROCHINIA UMBONATA (Stimpson) 



Plate 72; plate 73, fig. 1 



Scyra umbonata Stimpson, Bull. Mus. Comp. Zool., vol. 2, 1871, p. 115 



(type-locality, off Sand Key, Florida, 143 fathoms; type not extant). — A. 



Milne Edwards, Crust. Reg. Mex., 1875, p. 87; 1880, pi. 31 A, figs. 5-56; 



Bull. Mus. Comp. Zool., vol. 8, 1880, p. 2. 

 Scyramathia umbonata A. Milne Edwards, Comptes JRendus Acad. Sci., 



Paris, vol.91, 1880, p. 356. (See Sars, Norske Nordhavs Exped., vol. 14, 



Crustacea, pt. 1, 1885, pp. 6, 7 and 274; also Smith, Rept. U. S. Commr. 



of Fish and Fisheries for 1885 (1886), p. 625 [21]). 

 Anamalhia umbonata Rathbun, Proc. U. S. Nat. Mus., vol. 17,1894, p. 61, pi. 



1, figs. 1-3.— Faxon, Mem. Mus. Comp. Zool., vol. 18, 1895, p. 10. 



Diagnosis.— M.Q,6\?in tubercles four; gastric tubercles four; dorsal 

 tubercles mostly large and flat-topped. No spine on basal antennal 

 article or at buccal angle. A tubercle at end of merus of ambulatory 

 legs. 



Fig. 85.— Rochinia umbonata (11377), front and orbit, after Rathbun. a. Male, total length 



OF carapace 26.5 MM. 6, MALE, total length of carapace 28 MM. C. OVIGEROUS FEMALE, TOTAL 

 LENGTH OF CARAPACE, 31 MM. 



Description. — Surface covered with a close tuberculiform pubescence 

 with longer club-shaped setae on the margins of the legs and slender 

 curved setae on the rostrum and gastric region and outer margin of 

 branchial region. Carapace with nine tubercles on the dorsal surface, 

 of which six are usually large, flattened and irregular in shape, and are 

 situated on the posterior gastric, the cardiac, and two on each bran- 

 chial region, the anterior of which is the larger; the three smaller tuber- 

 cles are gastric, one anterior median, the others lateral. An hepatic 

 and a branchial marginal spine, which may be either triangular, flat- 

 tened and somewhat appressed, or conical and projecting outward. 

 There is a small tubercle on the middle of the posterior margin, or of a 

 raised ridge parallel to the posterior margin. Orbits variable, either 

 narrow with the supraocular eave somewhat convex in outline and the 

 preocular spines directed forward and subparallel to each other, or 



