1894. 



PROCEEDIXGS OF THE NATIONAL MUSEUM. 



497 



There is a feiiuile .specimen in the National Miiscum, collected by A. 

 B. Steinberger, at Samoa (No. 5147, U.S.N.M.). 

 Length of the body, 14 cm. 



ODONTODACTYLUS HAVANENSLS, 15 i 

 Plate XX. 



e 1 o w. 



Gonodactijhis hdraiieii.siH, BiGKLow, .lobiis HopkiiLS Univ. Cirt'., lOfi, ]>. 101, June, 

 1893. 



Diagnosis. — An OdontodactylKS, having large, subspherical eyes; 

 large anteunal scales; the dactylus of the raptorial claw strongly 

 dilated at the base and provided with six small marginal teeth besides 

 the terminal one; a transverse rostrnm withont angles; a nearly square 

 carapace with rounded corners; three exposed tlioracic segments with 

 rounded margins; six spiiies on the sixth abdominal segment; a dorsal 

 crest and four otlier carina^ on the telsou, six margin 1 s])ines, the sub- 

 median pair with mobile tips, and numerous minute submediau denti- 

 cles, two intermediate, and one lateral one on each side; rather large 

 uroi)0(ls with two simi)]e basal spines, tlic outer one the longer. 



General description. — A single speeinicu of this niteresting species 

 was found in a bottle with a young 0. ehireujra both having been col- 

 lected by the Alhafro,ss in the (lulf of 

 INIexico, off Havana. The body is short 

 and broad, and is convex on the dorsal 

 side (pi. XX). The sides of the carajiace, 

 thoracic segments, and abdomen form 

 nearly a straight line. The width of the 

 carai);K'e at the anterior end equals one- 

 tlfth of the length of the body, while the 

 width of the abdomen at the iiftii seg- 

 ment equals about one-fourth of it. The 

 rostrum is twice as broad as it is long 

 and is evenly curved in front. The car- 

 apace is almost perfectly square. It is 

 a little narrowed in front and the pos- 

 terior aiul anterior margins are slightly 

 incurved. Only three thoracic segments 

 are exposed. These have rounded mar- 

 gins and like the carapace and the lirst 

 hve abdominal segments are devoid of 

 cariniTe. The third, fourth, and fifth ab- ventn.i»,je, ihei.m.su.tur.i.^,^-. 



dominal segments have posterior lateral 



spines. The sixth segment has six cariuic- ending in spines and two 

 additional tubercles on each side, one betweeii the submediau and 

 intermediate carintE and another betweeii the intermediate and lateral 

 ones. There are no spines at the articulations of the urojwds (lig. 1). 

 The telson has a narrow eleAated dorsal median crest ending in a 

 Proc. X. M. 1)4 32 



Fi-. I. 



RIGHT UEOPOI) l)F ODONTODACPYLUS 

 HAVANENSIS. 



