230 ANNALS OF SCOTTISH NATURAL HISTORY 



it as common. The larger specimens in our collection range 

 from 45 to fully 50 mm. in length from the apex of the rostrum 

 to the extremity of the tail. 



CRANGON ECHINULATUS, M. Sars ( = C. SERRATUS, Norman^}. 

 This species was discovered about the same time by M. Sars and 

 Norman, unknown to each other, but Sars' description appears to 

 have been first published. 



In this species the rostrum is nearly as in C. vulgaris, being 

 moderately narrow, and tapering to the somewhat acute apex. The 

 armature of the carapace resembles that of C. spinosus. Five ridges, 

 one central and two on each side, extend nearly the whole length 

 of it, while posteriorly a short ridge terminating in a small tooth at 

 its anterior end occurs on each side of the central ridge. The 

 central ridge is usually armed with three teeth, and the principal 

 ridge on each side of it with five or six, but the other two lateral 

 ridges have usually only two teeth near the proximal end. All these 

 teeth are depressed and directed forwards. The third, fourth, and 

 fifth abdominal segments are keeled along the median dorsal line ; 

 the dorsal surface of the sixth is flattened and slightly grooved, and 

 the telson is also slightly grooved at the base. 



The species appears to be widely distributed, but the only 

 localities from which it has been recorded are the Shetland Islands 

 and the Hebrides, where it was discovered by the Rev. A. M. Nor- 

 man ; off Skate Island, Loch Fyne, where Dr. Henderson obtained 

 a single specimen ; and near the mouth of the Clyde estuary, where 

 it was found moderately frequent by the fishery steamer Garland. 



A female (with ova) measured 34 mm., and another specimen 

 (without ova) 45 mm. in length. 



CRANGON SCULPTUS, Bell. This species, which appears to be 

 rare in Scottish waters, I have not seen. The only Scottish records 

 known to me are the following : (i) two specimens were captured 

 in five fathoms in Lamlash Bay, Firth of Clyde (Norman) ; (2) a 

 single specimen was dredged in twenty fathoms off Muggie Point, 

 Little Cumbrae (Henderson) ; and (3) the species is recorded for 

 the Moray Firth in Smiles' " Life of Thomas Edward." 



The following brief description of the species is derived from 

 Bell's " British Stalk-eyed Crustacea " : Rostrum short and compara- 

 tively broad, and abruptly truncate at the apex. The armature of 

 the carapace resembles that of C. spinosus. The abdominal seg- 

 ments have their dorsal surface distinctly sculptured, the raised 

 portions being polished, while the depressions are slightly pubescent. 

 The third, fourth, and fifth segments are distinctly keeled, but the 

 sixth segment and telson are channelled. The rostrum in this 

 species appears to resemble very closely that of C. fasciatus. 



1 "British Assoc. Rept. for 1861 " (pub. 1862), p. 151. 



