OXYSTOMATOUS AND ALLIED CRABS OF AMERICA ][Q1 



anterolateral angle; these spines have a tendency to form fingerUke 

 groups. Rostrum deflexed at base and elevated a Uttle toward 

 extremity; inferior spines short; the two basal prominences above 

 consist of a strong obtuse spine accompanied by some smaller ones; 

 behind the rostrum, a transverse depression of carapace. 



Ocular peduncles longer than in C. asper, and with spines reduced; 

 corneal surface small with light brown pigment. ^^ Antennules barely 

 concealed under rostrum; fiagellum of antennae composed of five 

 articles. Epistome shorter than in C. asper, terminated behind by a 

 vertical palate, the median part of which formes a regular curve and 

 has only a shght elevation. Feet garnished with obtuse spines of all 

 sizes. Chelipeds strong and equal; chelae convex on both faces; 

 fingers bent inward and downward from their base, granulate and 

 with a narrow hiatus. Merus, carpus, and propodus of first two 

 ambulatories stout; dactyl bent slightly inward and somewhat longer 

 than propodus; the largest spines have a tendency to dispose in longi- 

 tudinal lines on merus. The last two pairs of legs barely reach base 

 of carpus of the preceding, and have a strongly falciform digit. 

 Terminal article of male abdomen reduced, its lateral borders sUghtly 

 convex inward. 



Measurements. — Male (18684), length of carapace 8, width 7 mm. 

 Female (18684), length 9, width 7.2 mm. 



Range. — Florida Keys to Puerto Rico; 70 to 300 fathoms. 



Material examined. — See table 31, page 102. 



Genus CORYCODUS A. Milne Edwards 



Corycodus A. Milne Edwards, Bull. Mus. Comp. Zool., vol. 8, p. 23, 1880 (type, 

 C. bullatus A. Milne Edwards). — Alcock, Journ. Asiat. Soc. Bengal, vol. 65, 

 p. 274, 1896. — A. Milne Edwards and Bouvier, Mem. Mus. Comp. Zool., 

 vol. 27, p. 86, 1902. — Ihle, Die Decapoda Brachyura der (Sf6ogra-Expedition, 

 monogr. 39b', p. 124, 1916. 



Nasinatalis Stebbing, Ann. South Afr. Mus., vol. 6, p. 340, 1910 (type A'', dis- 

 junctipes Stebbing). 



Carapace subpentagonal, extraordinarily swollen and thick espe- 

 cially in front where the facial region represents the anterior angle of 

 a pentagon. A considerable space between insertion of cheliped and 

 that of the first ambulatory. The body seems truncate behind by 

 reason of the very backward position occupied by the abdomen of 

 female, which covers only the last three segments of the sternum. 

 Antennules much reduced, completely retractile in orbital cavity 

 where they are protected by the valvular peduncle of the antennae. 

 Exognath short, surpasses a little the end of ischium of endognath; 

 the first and second maxillipeds have short palps on the exopodite. 



West Indies; South Africa; Sulu Sea. 



" The type specimen has lost its pigment. 



