142 BULLETIN 166, UNITED STATES NATIONAL MUSEUM 



along a suture line. Suborbital border entire. Endognath of outer 

 maxillipeds overreaching exognath, which has a rounded extremity. 

 Eyes large. Chelipeds short and strong. Abdomen of male \\ath 

 segments 3-5, of female with 4-6 fused; in male a backward-pointing 

 spine on sixth segment. 



To this genus are referred all of the Ebalia or Lithadia species 

 having deep hollows or caves within the posterior half of the carapace. 

 North Carolina to Cape St. Roque, Brazil; west coast of Mexico. 



KEY TO THE SPECIES OF THE GENUS 8PELOEOPHORTJS 



A.*. The deep cavity of the carapace has only two orifices, invisible 

 in dorsal view^. 



B^ Carapace hexagonal nodosus (p. 142) 



B*. Carapace trigonal schmitti (p. 143) 



A2. Carapace octagonal and with four orifices, of which two 

 are visible in dorsal view. 

 B*. Carapace broader than long. 



C. Dorsal pair of orifices small. Carapace highest at anterior 



end of branchial elevation pontifer (p. 144) 



C^. Dorsal pair of orifices large. Carapace highest near middle 



of branchial elevation; naiTOwer than pontifer elevatus (p. 145) 



B'. Carapace longer than broad, strongly constricted behind 



frontal margin. Superior orifices circular digueti (p. 148) 



SPELOEOPHORUS NODOSUS (Bell) 



Plate 40, Figures 1-5 



Oreophorus nodosus Bell, Trans. Linn. Soc. London, vol. 21, p. 307, pi. 33, 

 fig. 8, 1855 (type locality unknown; type in Brit. Mus.). 



Spelocophorus nodosus A. Milne Edwards, Ann. Soc. Ent. France, ser. 4, vol. 

 5, p. 149, 1865.— Rathbun, Bull. U. S. Fish Comm. for 1900, vol. 20, pt. 2, 

 p. 89, 1901.— Hay and Shore, Bull. U. S. Bur. Fisheries, vol. 35 (1915-16), 

 p. 425, pi. 32, fig. 4, 1918. 



Spelaeophorus nodosus Stimpson, Ann. Lye. Nat. Hist. New York, vol. 10, p. 

 119, 1871. — Rathbun, Ann. Inst. Jamaica, vol. 1, p. 37, 1897. 



Diagnosis. — Carapace pentagonal or hexagonal, broader than long. 

 Only two orifices in hinder half of carapace ; orifices are posterior and 

 invisible in dorsal view. 



Description. — Carapace about one-fifth broader than long, pen- 

 tagonal, intestinal region concealed in dorsal view, posterolateral 

 angles rounded; surface covered with crowded granules and nodose; 

 an elevated protuberance on hepatic region, a transverse hne of 

 nodules across middle of carapace and one above each posterior 

 cavity; a median ridge on gastric region. In a large specimen the 

 nodules are fused, those over the cavities forming two large coils. 

 Cavities large, invisible in dorsal view. Carapace of cf much more 

 uneven than that of 9 . Hepatic region thick, margin rounded; 

 pterygostomian region with a prominent bunch of granules; antero- 

 lateral branchial margin with two similar bunches of granules; 

 posterolateral lobe and upper part of cavity sharp-edged. Posterior 



