136 Notes on Worth American Crustacea. 



the carina being slightly flattened and longitudinally grooved at the 

 point where the cervical sulcus crosses, and bearing a small tooth or 

 s])iue behind the base of the rostrum. The rostrum is straight, cnsi- 

 form, reaching the middle of the penult joint of the peduncle of the 

 antenniG, and pointing forward and upward at an angle of about 20° 

 with the horizon. It has a strong lateral carina, with a groove on 

 each side of it, the upper groove being continued backward as far as 

 the little gastric tooth of the carina of the carapax. Its dorsal crest 

 is armed with eight teeth, which are equidistant, and diminish regu- 

 larly in size toward the extremity, the anterior tooth being very near 

 to this extremity, which is slender and acute. The inferior margin 

 of the rostrum is ciliated and entire, without teeth. Eyes large, reni- 

 form. Antennula) stout ; peduncle longer than the flagellum, over- 

 reaching the acicle or scale of the external antenme, and very pubes- 

 cent above ; its penult joint three or four times as long as the termi- 

 nal joint. Feet of the first two pairs armed with a spine on the basis 

 joint. Last pair of feet longer than the fourth pair, and nearly 

 reaching the extremity of the acicle ; dactylus half as long as the 

 penult joint. Abdomen carinated from the foui-th to the sixth joint 

 inclusive; carina cristiform. Median sulcus of last joint very deep 

 and narrow, defined by two carinte : this sulcus is abruptly termin- 

 ated at the base of the mucronate point which forms the posterior 

 extremity of the joint. The fij-st pair of abdominal appendages in 

 the male have the inner lamella? soldered together and folded, but di- 

 verging at the tip, forming two haixl, lunate processes like the flakes 

 of a grapple ; the distance between the tips of these processes eqiial- 

 ling two-thirds of the length of their peduncle. 



Dimensions of a male specimen: Length, excluding antennae, 1.70; 

 length of carapax, rostrum included, 0.60 ; length of rostrum, 0.22 ; 

 length of penult joint of the abdomen, 0.20 inch. 



This species was dredged by me at the depth of four fathoms 

 on a sandy bottom in the harbor of Beaufort, N. C, and I have 

 also taken it in Ciiarleston Harbor. 



