Crustacea of the Channel Islands. 3G5 



AmpJiilocJius neapolitanus, Delia Valle, = A. melanops, Walker. 



Bordeaux Harbour, Guernsey ; and Jersey. 

 Peltocoxa Marioni, Catta, = Cijiiroidea damnonimsis, Stebbing, 



Jersey. 

 Stenothoe monocidoides, Montagu. Guernsey and Jersey. 



marina, Bate. Jersey (KoeJder). 



Metopa ruhrovittata, G. 0, Sars. Bordeaux Harbour, Guernsey. 

 horudis, G. 0. Sars. Off St. Martin's Point, 25 fath. ( W.). 



Aletopa sarniensis, sp. n. (PI. XVII. figs. 1-5.) 



A very small species. The antennules and anteunte are 

 subequal in length, and the peduncles of both are quite 

 smooth and devoid of setae. The first joint of peduncle of 

 the antennules is stout and equals in length the two following 

 joints ; the flagellum is 8-jointed, the first of these joints 

 equals in length the last two joints of the peduncle. The 

 first gnathopod (fig. 1) is remarkable on account of the very 

 short carpus, which is somewhat triangular ; the propodos 

 equals nearly three times tiie length of the carpus, it gradually 

 tapers for the attachment of the gently curved finger ; the 

 propodos has one seta on the side near the end and a bundle 

 of three below the attachment of the finger; the finger (fig. 2) 

 has its distal portion minutely denticulated or serrated ; two 

 minute setse are on its side above the serrations, and there 

 are no others. 



The second gnathopod (fig. 3) is subchelate and resembles 

 that of many members of the genus in its general form. The 

 hand widens gradually and slightly from its base, and distally 

 is abruptly truncated, so that the palm is transverse (fig. 4); 

 the nail is strong and about equals the transverse palm in 

 length; it has on its back four setae, and on the palm where 

 the tip of the finger meets it there is a group of slender spines 

 and a i^v^"^ set«. 



The last peroeopods (fig. 5) have the basos outspread behind 

 into a thin lamina, which is devoid of setaj or spines ; the 

 raeros is expanded behind and projects down to near the 

 extremity of the carpus. 



The first gnathopods are, perhaps, more valuable in this. 

 genus for specific characters than the second, though tjie 

 latter are so much the larger. In this species the first 

 gnathopod is quite different from that of any other species 

 of the genus known to me ; both the very short carpus and 

 the serrated tip of the finger are quite exceptional. 



A single specimen was dredged, July 1906, not far from 

 the harbour of St. Peter's Port, Grucrnscy. 



