MUSEUM OF COMPAKATIVE ZOOLOGY. 125 



ocular spine minute. External antennae exposed from above ; basal joint 

 narrow. Antennulary fossae large. Epistome two thirds as long as it is 

 broad. Meros-joint of the external maxillipeds without any notch at the 

 interior angle where the palpus is inserted ; external angle sharply prom- 

 inent. Chelipeds in the female shorter than the carapax. Ambulatory 

 feet of the first pair very long, twice as long as the carapax, with the 

 dactylus nearly straight, and three fourths as long as the penult joint. 

 Ambulatory feet of the posterior two pairs shorter and stouter than those 

 of the anterior two, and with prehensile extremities ; those of the penult 

 pair shorter than those of the last pair. 



Anomalopus furcillatus nov. sp. 



Carapax minutely pubescent, unarmed except in front, regions scarcely 

 defined. Rostrum equalling in length two thirds that of the post-frontal 

 part of the carapax, forked in the terminal half of its length ; horns but 

 slightly divergent. External antenna? much shorter than the rostrum ; 

 flagellum as long as the two joints preceding it taken together. Anten- 

 nulae reaching to the extremity of the peduncle of the antennae. Cheli- 

 peds with a small spine on the outer side of the carpus ; hand very small ; 

 fingers half as long as the palm and much gaping. 



Dimensions of a female: Length of carapax 0.67; breadth, 0.25; 

 length of ambulatory foot of the first pair, 1.50; of the third pair, 0.48 ; 

 of the fourth pair, 0.82 inch. 



Of this species I find but one .specimen in the collection, a female, which 

 was taken at the depth of 123 fathoms off' " The Samboes." 



Family LEPTOPODIIDAE. 



This family is characterized by an entire want of orbits and of a true 

 post-ocular spine, and by the great length of the feet. 



Subfamily LEPTOPODIINAE. 



Leptopodia sagittaria Leach. 



Cancer Sagittarius Fabricitts, Ent. Syst., II, 442. 



Inachus Sagittarius Fabricius, Suppl. Ent. Syst., p. 359. 



Cancer seticornis Herbst, Naturg. d. Krabben u. Krebse, III, pi. Iv, fig. 2. 



Leptopodia sagittaria Leach, Zo61. Misc., II, pi. Ixvii. Latreille, Encyc. 

 Meth. pi. ccxcix, fig. I. Desmarest, Consid. snr les Crust., pi. xvi, 

 fig. 2. Guerin, Iconographie du Regne Anim., Crust., pi. xi, fig. 4. 

 H. Milxe-Edwards, Hist. Nat. des Crust, I, 276 ; pi. xv, fig. 14. Iliust. 

 Cuv. Regne Anim., Crust., pi. xxxvi. Gibbes, Proc. Am. Assoc, 1850, 

 p. 169. Desbonne et Schramm, Crust, de la Guadeloupe, p. 1. 



