1894.] NATURAL SCIENCES OF PHILADELPHIA. 193 



verging posteriorly. Posterior margin truncated and provided with 

 seven spines. The median line of this segment is occupied by a 

 longitudinal keel, produced to the end of the middle spine of the 

 posterior margin. This spine is somewhat longer than the others 

 which are likewise somewhat unequal, on either side the second (from 

 the middle outwards) being a little longer than the other laterals. 

 Stem of the uropoda produced at the inner posterior angle, outer 

 branch elongated, the margins nearly parallel, acuminated at the 

 end. The inner branch almost triangular, acuminated posteriorly, 

 longer than the outer, not looking over the telson. Both branches 

 with several prickles at the margins. 



The legs were originally covered with hair, but now are nearly 

 worn bare because of the dry conservation. The hairs on the mar- 

 gins of the uropods and the telson are also preserved only here and 

 there. 



This species occurs on the Japanese coast, near Enoshima, Sagami 

 Bay. The depth is not recorded; probably it lives associated with 

 the famous Japanese Hexactinellidse and Lithistidse. The types be- 

 long to the Döderlein collections and are deposited in the museum 

 of Strassburg, Germany. 



