OP ARTS AND SCIENCES. 119 



This species is near C. cxtraneus, but differs in its longer and nar- 

 rower areola, in the short hand and long fingers, the single superior 

 ante-apical spine on the meros, naked thoracic sterna (in G. extraneus 

 they are setiferous), the greater smoothness of the body altogether, 

 and the fineness of the puuctation of the carapace ; the sub-orbital 

 angle is very much more projecting than in C. extraneus. 



This species was discovered by Mr. C. L. Herrick in Cyprus Creek, 

 Lauderdale Co., Ala,, when collecting under the auspices of the U. S. 

 National Museum, in October, 1882. The specimens obtained were 

 two males, form II., and three females. 



10. C. JoRDANi, sp. nov. 



Male, form II. Rostrum broad, subplane, sides nearly parallel, 

 acumen long, with minute lateral teeth at base. Post-orbital ridges 

 provided with sharp anterior spines. Carapace punctate (sparsely so 

 on the gastric region), slightly granulated on the sides. A single 

 acute spine on each side of the carajiace behind the cervical groove, 

 and a branchiostegian spine on the anterior border. Sub-orbital angle 

 prominent. Areola long, narrow, widening gradually anteriorly, 

 suddenly posteriorly, smooth, with but few puncta irregularly dis- 

 posed in its field. Abdomen longer than the cephalo-thorax ; proxi- 

 mal segment of the telson bispinous, distal segment rounded posteriorly. 

 Epistoma triangular. Antennae equal in length to the body minus the 

 telson, scale broad, greatest width toward the distal end, which is sub- 

 truncate and furnished with a sharp external spine. Third pair of 

 maxillipeds hairy within. Chela punctate, ciliate ; inner margin of 

 hand short, serrate ; fingers long, costate, outer border of movable one 

 serrato-tuberculate. Carpus with a strong, acute, median spine, and 

 a small basal spine on inner border; a small spine at each articulation 

 with the chela. Meros smooth on the external surface, two ante-apical 

 spines obliquely placed on the upper edge. First pair of abdominal 

 appendages short, thick, articulated near the base, terminating in two 

 blunt, recurved teeth. 



Length of body 47 mm. 



" " carapace 23 " 



" " abdomen 24 " 



" " rostrum 6 " 



" " acumen of rostrum 2 " 



Length from point of rostrum to cervical groove 15 " 



" " cervical groove to hind margin of carapace . . 8 " 



Width of areola 1.3 " 



Length of antenna; 44 " 



