MUSEUM OF COMPARATIVE ZOOLOGY. 95 



Fig. 1 c). The first segment is quite concealed ahove, and the second more 

 or less concealed also in the ordinary position of the segments. In the ventral 

 portions (jf the first three pleonal segments the posterior angles are rounded 

 instead of being acute, as in both the G. j)oUta and G. concharum; laterally the 

 second, third, and fourth segments are ciliated, as in botli those species. The 

 telson (PL II. Fig. 3) is much like that of C. 2^olitu (PI. II. Fig. 2). The 

 uropods have the basal segment produced internally; the outer ramus is about 

 half as wide as the inner, which has a distinct notch near the distal end of the 

 outer border and is obliquely truncate, or, in the larger specimens, emarginate 

 at the end; both rami, like the end of the telson, are strongly ciliated, but 

 si)aringly spinulose. The telson is distinguished from that of G. concharum 

 (PL II. Fig. 4) by the emargination at the tip in that species. The stylet on 

 the second pair of pleopods in the male (PL I. Fig. 3) is simple, ensiform, and 

 tapers to a blunt point ; it surpasses the lamella to which it is attached. 



The four large females of this species obtained by the Blake Expedition 

 measure in length 21-23 mm. and in breadth 6-6.5 mm. Specimens obtained 

 by the U. S. Fish Commission are many of them smaller, but vary from 15 to 

 27 mm. in length. 



The specimens were obtained at Station 336, Lat. 38° 21' 50" K, Long. 

 73° 32' W., from a depth of 197 fathoms. Others have also been obtaineil by 

 the U. S. Fish Commission at the following stations: — 



W. Long. Specimens. 



70° 23' 40" 4 



70° 31' 11 



69° 47' 1 



69° 47' 2 



j^ga psora (Linne) Kroter. 



One specimen from 306 fathoms at Station 303 in Lat. 41° 34' 30" N., 

 Long. 65° 54' 30" W. 



1 ^ga Webbii (Guerin) Schiodte & Meinert. 



Pterelas Webbii Guerin, Mag. Zo51., Classe VIL, PI. XX. 1886. 

 yEfja Webbii SchiGdte & Meinert, Naturhist. Tidssk., R. IlL, B. XII., p. 347. 

 PL X. (Cym. IV.) Figs. 1-4. 1879. 



A single immature specimen of this, or a closely allied species, was taken 

 at Station 307, Lat. 31° 57' N., Long. 78° 18' 35" W.-, from a depth of 333 

 fathoms. It measures 10.5 mm. in length, 5.5 mm. in breadth, and has not 

 yet developed the seventh pair of legs, but the propodi of the second and third 

 pair of legs are armed with the characteristic cultriform spine, and I have 

 referred it to this species, though not with certainty. 



