Mr. P. H. Gosse on new or little-known Marine Animals. 155 



the thorax, which was alternately banded with brown and pale 

 yellow, and the eyestalks, which were pale yellow. A narrow 

 band of whitish drab running along the median line of the ab- 

 donaen, and expanding into a broad oval spot on the fourth seg- 

 ment, is pretty constant in all, and may be considered cha- 

 racteristic. 



The rostrum has four teeth on the upper edge, quite as often 

 as three, if not oftener ; and the extremity is occasionally trifid. 



This is one of the most common of the smaller Crustacea in- 

 habiting the deeper parts of the coralline zone in Weymouth Bay. 

 It is brought up in almost every haul of the dredge or keer-drag. 



Hippolyte Thomp&oni (Bell). Thompson's Hippolyte. 



The denticulations of the upper edge of the rostrum in this 

 Prawn are not simple serratures of the edge as in Hip. Cranchii, 

 and in the true Palcemons, but triangular spines articulated to 

 the edge. In Pandalus annulicornis the same structure exists, 

 and the superior size of this latter species facilitating manipu- 

 lation, I found that by means of a fine needle I could move the 

 spines to and fro with considerable freedom, on their articulated 

 bases. The spaces between the spines are occupied in both 

 these species by rows of short bristles graduated in length, as in 

 Palcemon serratus. 



Crangon sculptus (Bell). The Sculptured Shrimp. 



This pretty species varies exceedingly iu colour. In one of its 

 most common conditions, the ground colour is a plain drab, 

 which is studded with minute blackish dots, and stellate specks 

 of reddish brown. The body, especially the abdomen, is elegantly 

 clouded with pale sienna-brown in a sinuous but symmetrical 

 pattern. The sinuosities are in some parts edged with pale blue, 

 and there are three more conspicuous spots of bright azure blue, 

 set at equal distances along the median line of the abdomen, each 

 of them taking the form of a semi-ocellus with a black pupil. An 

 undulating line or macular band of azure crosses the front of the 

 thorax. The ground colour of the fourth abdominal segment is 

 of a deeper brown than the rest, the difference being gradual an- 

 teriorly but abrupt posteriorly, where it ceases with a transverse 

 line of deep brown, imparting some resemblance to C. fasciatus. 

 Sometimes there is a broad well-defined band of deep brown 

 across the hinder part of the thorax. One specimen that I have 

 seen had the whole upper parts opake white, minutely freckled 

 with buff; except the last abdominal segment and the tail -plates, 

 which, as well as the sides of the body and the false feet, were 

 freckled with blackish purple. 



11* 



