THE SPIDER CRABS OF AMERICA 309 



third; they have also small lateral spinules; coalesced segment very- 

 large and smooth; terminal segment broadly rounded at the extremity. 

 The abdomen has scattered hairs like the rest of the surface. 



Variations. — The rostrum is of variable length and may, or may 

 not, be divided to its base. Supraorbital spine variable in size and 

 position. 



Measurements. — Ovigerous female (6941) , length of carapace, includ- 

 ing rostrum, 23.5 ; length of rostral spines 8 ; width of carapace exclusive 

 of spines, 11; inclusive of spines, 16 mm. 



Range. — West Indies: Cuba; St. Vincent; Barbados; Grenadines. 

 Depth, 88 to 387 fathoms. 



Material examined. — See table, page 308. 



Genus CHORILIBINIA Lockington 



Chorilibinia Lockington, Proc. California Acad. Sci., vol. 7, 1876 (1877), 

 p. 69 [7]; type, C. angustus Lockington. — Miers, Journ. Linn. Soc. London, 

 vol. 14, 1879, p. 654; Challenger Rept., Zool., vol. 17, 1886, p. 4.5.— 

 Alcock, Journ. Asiat. Soc. Bengal, vol. 64, 1895, p. 221. 



Chlorolibinia H.\swell, Cat. Austral. Crust., 1882, p. 17; type, C. gracilipes 

 Miers. 



Carapace triangular. Rostrum long, broad, and emarginate at tip 

 as in Lihinia, but the eyes concealed beneath it as in CTiorinus and its 

 allies. Preorbital and postorbital spines acute, separated above and 

 below by an acute fissure and together constituting the orbit, (Lock- 

 ington.) 



Besides the type species from the Gulf of California, a species from 

 Papua and North Australia and another from the Andamans, have 

 been referred to this genus. 



CHORILIBINIA ANGUSTA Lockington. 



Chorilibinia angustus Lockington, Proc. California Acad. Sci., vol. 7, 



1876 (1877), p. 69 [7] (type-locality. Gulf of California; type not extant). 

 Chorilibinia angusta Miers, Ann. Mag. Nat. Hist., ser. 5, vol. 4, 1879, p. 7. 



Diagnosis. — Rostral horns comprising only one-third length of 

 of rostrum. A long spine on basal antennal segment. Chelipeds 

 slender, same length as next pair of legs. 



Description. — Whole of upper and under surface except inner side 

 of hand and upper surface of rostrum tomentose, with longer hairs at 

 intervals and a row of the latter on each side of rostrum. Carapace 

 triangular, narrowing gradually to region of eyes; orbits salient. 

 Rostrum long, shorter in female than in male, emarginate at tip, the 

 bifurcation divergent, extending only one-third length of rostrum. 

 Basal segment of antennae terminating outwardly in a long spine 

 which precedes the preorbital spine when viewed from above; next 

 two segments setose, slender, cylindrical. Preorbital spine large, 

 acute, separated from the acute postorbital spine by a pointed fissure 

 both above and below. Antero-lateral margin with three spines 

 5487— 25 1 22 



