6 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 9I 



5, second joint much more expanded than 4, with hind margin pro- 

 duced backward into a blunt lobe. Hind margin of seventh thoracic 

 segment bearing a short median dorsal tooth. Pleon segments i to HI 

 3 bearing a median dorsal tooth, on either side of which is a lateral 

 tooth. Pleon segment 4 with a low median dorsal ridge ending in a 

 small tooth, on either side of which is a very small lateral tooth. 

 Pleon segment 3 with postero-lateral margin finely serrate. Uropods 

 normal. Telson not reaching end of uropod 3, converging by gently 

 convex lateral margins to a narrow apex, which is cleft by a very 

 shallow notch forming short dehiscent pointed lobes, each of which 

 bears a notch and a setule on the outer margin. 



Length. — 6.5 mm. 



Holotype. — U.S.N.M. no. 69102, taken at station loi, latitude 

 i8°4o'3o" N. to i8°45'4o" N., longitude 64°5o'oo" W. to 64°48'oo" 

 W., March 4, 1933, 190 to 300 fathoms. 



