118 PROCEEDINGS OF THE AMERICAN ACADEMV 



upturned tip ; a pair of minute, brown horny teeth at base of the 

 acumen. Post-orbital ridges depressed, with sharp anterior spines. 

 Cephalo-thorax as long as the abdomen. Carapace flattened above, 

 densely and finely punctate, slightly granulated and finely ciliated on 

 the branchial and hepatic regions. Cervical groove sulcate, sinuate, 

 with minute lateral spine and terminating with a small branchiostegian 

 spine ; external angle of the orbit very prominent, ending in a spinule. 

 Areola long and wide, plane, punctate, in length more than one 

 half the distance between the tij? of rostrum and posterior margin of 

 the cai'apace ; sides nearly parallel to within a short distance of the 

 posterior margin, where they diverge. Telson bispinous on each side. 

 Anterior process of epistoma broad. AntennjE longer than the body, 

 scale moderately broad, ending in long, acute apical spine. Third 

 pair of maxillipeds hairy within. Chelipeds moderate ; chela large, 

 densely punctate, inner margin short, lightly serrate; fingers long, with 

 parallel rows of puncta, toothed within, outer one bearded within at 

 base. Carpus broad, obliquely truncated, punctate above, with a 

 strong median sjjine on the inner side and a small double one at the 

 base ; below the carpus is armed with a spine on the anterior border. 

 Meros smooth, with a single ante-apical spine on the upper edge and 

 the usual biserial ones beneath; of the latter, only two or three at 

 the proximal end are developed. Thoracic sterna naked. Third pair 

 of legs hooked on the third segment. Fourth pair of legs with a 

 small ovate basal tubercle. First pair of abdominal appendages ar- 

 ticulated near the proximal end, stout, short, swollen in the middle. 

 External part with the compressed apex in the form of a strong, 

 obtuse, recurved tooth, double within ; internal part recurved, cylin- 

 drical, short, acute. 



Female. Annulus ventralis transverse, with a sigmoid sulcus. 



Measurements of an individual : — 



Length of body 60 mm. 



" " cephalo-thorax 31 " 



" " abdomen 29 " 



From tip of rostrum to cervical groove 20 " 



From cervical groove to hind margin of carapace 11 " 



Width of areola 3.5 " 



Length of rostrum 7.5 " 



" " acumen of rostrum 2.5 " 



" " chela 20 " 



" " inner margin of hand 7 " 



" " fingers 13 " 



" " antennas 58 " 



Cyprus Creek, Lauderdale Co., Ala. 



