1894. PROCEEDINGS OF THE NATIONAL MUSEUM. 511 



Males with a coutinnous tliiokeniug all around the outer margin 

 of the telson ; keel produeed into a sharp spine; denticles 5 

 to 7, 15-19, 1 15IFOHMIS, Bigelow. 



* * * * Dactylus with 8 teeth. Manns of raptorial limb with numer- 



ous immobile marginal spines rapiiidea, Fal)rieius. 



b". Lateral jirocesse.s of the fifth thoracic somite bilobed; no ventral spines 

 on this somite. 



1. Eyes snuill. Median carina of the carapace deeply bifurcated. 



NEPA. Latreille. 



2. Eyes large. 



* Dactylus with 5 teeth. Lateral processes of the sixth and seventh 



thoracic somites bilobed... ijL'IxquI'^I'K^'Tata, Brooks. 



* * Dactylus with 6 teeth. 



Lateral processes of the sixth and seventh thoracic souiites 



bilobed afeinis, Berlbold. 



Lateral processes of the sixth and seventh thoracic somites not 

 bilolied, posterior lateral angles of the carapace simply 



rounded aeha, Bigelow. 



Lateral processes of the sixth and seventh thoracic somites not 

 bilobate, posterior lateral angles of the carapaee project as 



rather i)rominent lobes l^evis (Hess) de ^Man. 



c. Eight or mor(< carina' on the first .5 abdominal somites, the dorsal surface of 

 the telson marked by carina' in addition to the median crest 

 and the carin;e at the bases of the marginal spines and 

 denticles. 

 c'. Eight abdominal carina'. 



* Dactylus with 3 teeth. Telson with 1 carina^ on eacji side of the 



crest FERUSSACi 1, Roux. 



* ' Dactyhui with 6 teeth. Telscn with 10 carina; on each side of the 



crest RUGOSA. Bigelow. 



c". More than 8 abdominal carina^. 



* Dactylus with 5 teeth. 



Nine carina; on the hind body supple.x, Wood-Mason. 



^^ery many carina; on tlie hind body ; lateral processes of the exposed 

 thoracic somites bilobate jitlticarixata, White. 



* * Dactylus with G teeth. Hind body with 5 median and 6 lateral 



carina' ; lateral jirocesses of tlu; exposed thoracic somites 

 bilobed COSTATa, de Haan. 



SQUILLA QUADRIDEN8, Bigelow. 

 SquiUd^ (jiiadrideiin, Bi(iEi,<>\\ , .lohns Hopkins I'niv. Circ. 106, p. 100, 18!l)->. 

 Diaf/iiosis. — A SqidJIa witli small triaiii;ular eyes having" the coi'ueal 

 axis slightly shorter than the peduueular and somewhat oblique; 

 dactylus of raptorial claw short, with four teeth; rostrum nearly Hat 

 and ovate; carapace without cariniTe except at the posterior lateral 

 angles, which are rounded, anterior lateral angles nearly right angles 

 and subacute; exposed thoracic segments without sudmedian carinai, 

 lateral process of the first very short and acute, of the second and of the 

 third broadly rounded; without submedian carinje on abdominal somites 

 except the sixth ; telson having a low crest ending in a spine and shal- 

 low symmetrically curved furrows on each side, no veutral keel, six 

 marginal spines, the submedian with mobile tips, and between them 

 on each side four to five submediau teeth, six to eight intermediate, and 



