OXYSTOMATOUS AND ALLIED CRABS OF AMERICA QJ 



narrow gradually from base to the rather reduced cornea; basal 

 article of peduncles mobile and very distinct. The basal article of 

 the antennular peduncle enlarges from base to extremity; it is flattened 

 on ventral side; the next article turns almost transversely outward 

 under the concave sm-face of the rostral horn; between this article 

 and the horn is folded the following article, and the flagellum recurves 

 outward above the last named; there is, therefore, a perfectly formed 

 antennular cavit}^ comprised between the vertical partition of the 

 front, tlie rostral horn, the basal article of the ocular peduncle and the 

 antenna] peduncle. The antennal flagellum nearly reaches the 

 extremity of the cheUpeds. Buccal cavity quadrangular, narrowing 

 behind. 



Chelipeds slightly unequal; merus 3-sided; a shallow arched sinus 

 on outer surface of carpus. Fingers spooned, white and naked except 

 at the base; the dactylus is bent downward and slightly inward from 

 the palm; it has a tooth at base of outer prehensile edge, and a small 

 tooth on either side of the pointed tip which fits into the notch of the 

 immobile finger; this last has, beside its two terminal teeth, four more 

 on the outer edge. The next two pairs of feet do not overreach the 

 cheHpeds; the last two pairs are scarcely chelate, the strongly arched 

 dactylus in the midst of a crown of spines bordering the extremity of 

 the propodus. The terminal segment of the abdomen is nearly as 

 long as the sum of the remaining segments; in the male it is narrower 

 than segments 3-6 and is much longer than broad; in the female it is 

 somewhat heart-shaped and broader than long. 



Measurements. — Type female, total length of carapace 26, greatest 

 width 19 mm (after Milne Edwards and Bouvier). Ovigerous female 

 (57069), total length of carapace 9.8, greatest width 8 mm. 



Range. — From Straits of Florida to Barbados; 70 to 229 fathoms. 



Material examined. — See table 16, page 64. 



Superfamily Thelxiopeidea, new name 



Homoliens (part), Milne Edwards, Histoire naturelle des Crustac^s, voL 2, 



p. 180, 1837. 

 Homolidea Alcock, Journ. Asiat. Soc. Bengal, vol. 68, p. 12G, 1899. 



Carapace longer than broad; Zmea anomurica, or suture line, running 

 on either side from posterior border of carapace to inner side of an- 

 tennal spine, usually present. Eyes not retractile into orbits, nor 

 antennules into pits. Basal article of antennules subglobular. The 

 eyestalks consist of two movable joints, a slender conspicuous basal 

 joint and a stout terminal joint that carries the eye. Antennal 

 flagella, except in Latreilliidae, much longer than carapace. Inter- 

 antennular septum a distinct vertical process. The front forms a 

 slender triangular prominent rostrum wliich may be bifid at tip, and 

 often has a spine on either side at base. Division between epistome 



