DISTRIBUTION OF THE CLYDE CRANGONIDAE. 



69 



Fhilocheras neglectus (G. O. Sars).— In this species the rostrum 

 is moderately broad, and well rounded at the apex. The 

 carapace is of a uniform brown colour, while the fourth abdominal 

 segment and tail-fan have each a transverse band of the same 

 colour. This conspicuous coloration might serve as a ready 

 means for the identification of the species, but as P. Jasciatus 

 (Risso) imitates closely this type of coloration one requires to be 

 careful. The last-named species, however, may be readily 

 separated from P. neglectus by the broadly truncate apex of the 

 rostrum.* 



Dr. Scott was the first to record this species from Loch 

 Tarbert (Loch Fyne) in 1886, and it is evidently not at all 

 common in our waters. My only captures have been two 

 specimens from Ettrick Bay, ten fathoms, and one specimen from 

 Lamlash Bay, eight fathoms. 



Philocheras sculptus (Bell).— The rostrum in this species is 

 comparatively broad and abruptly truncate at the apex. (In one 

 of my specimens the apex is slightly concave.) There are five more 

 or less irregularly formed ridges armed with teeth. The central 

 ridge has two prominent teeth, the principal ridge on either side has 

 three or four very small teeth, and each of the two lateral ridges 

 have two strong teeth near to the proximal end. The dorsal 

 surface of the abdominal segments are sculptured, the third, 

 fourth, and fifth segments are keeled, and the sixth segment 



* Note. —Since this paper was read before the Society I have been 

 successful in obtaining a specimen of Philoelitraa fasciatm (Risso) from 

 Garrison Bay, Millport, iu about two fathoms. It is a female with ova, and 

 measures about -2.0 mm. from extremity of rostrum to end of telson. The 

 carapace exhibited a greenish tint and was dotted with small brown spots, 

 the sides of the pleura being marked with deep purple. The abdominal 

 segments are of a much lighter green than the carapace. The fourth 

 segment exhibited both anteriorly and posteriorly pale grey bands, which 

 threw the middle portion (which had exactly the same tint of green as the 

 rest of the abdominal segments) into relief. This gave to the Crustacean 

 the appearance of having a transverse band on this segment of a much 

 darker hue. There was no indication of any band across the telson and 

 uropods. The departure from the normal coloration in this species and 

 F. bispiiwsus is interesting, but I am now inclined to the belief that, 

 among many of our Crustacean species, colour is of little specific value. 



