Crangon and Galatliea. 75 



The abdomen gradually tapering, not abruptly, so as iu Ch. Paftersonii ; the 

 first to fourth segments are obtusely carinated, the fifth bicarinated; the carime 

 confluent above, so as to include a triangular sulcation. In young specimens, 06 

 incli long, the carinations are parallel, and the sulcation consequently longitu- 

 dinal ; the sixth bicarinated and sulcated in old specimens ; in young, bi- 

 carinate and plane. 



Telson elongate, triangular, and concave at its origin ; posterior pleopods 

 and their accessory scales long and narrow. 



Colour varies. In the specimens captured at Belfast, I find it of the same 

 colour as Cr. vulgaris, but lighter. Mr. Gosse describes a Weymouth specimen 

 as " drab, or pale wood-brown, with a well-defined band of opaque white across 

 the fourth segment, a much broader one across the front of the carapace, an ir- 

 regular broad white baud running down longitudinally on each side, and bound- 

 ing an oblong insulated drab mark; tail-plates with a transverse drab band, 

 under parts of body and legs, spotted with ciimson." 



Length, 1*5 inch. 



Habitat, clean, gravelly sand. 



Localities, Gobbins, Belfast. Cork (J. V. Thompson) ; Isles of Arran, 

 Gal way (Prof Melville).^-*' 



A single specimen of this species occurred to me at the Gobbins, in August, 

 1858 ; it was only 0'6 of inch. It has occurred but rarely to Professor Mel- 

 ville at Gal way. 



The synonymyof this species is involved in much confusion. Examination 

 of the suite of specimens in the British Museum and Jardin des Plantes lead 

 me to coincide with Professor Bell in the rejection of the alleged synonymes of 

 Roux, Risso, and Olivi ; the species alluded to by them belongs to the next 

 section, ^geon. 



There is no doubt of the distinctness of this species from Ch. bispinosiis, 

 trispinosus, and Paftersonii, as it is much more sculptured and carinated, and 

 diflers in the form of the rostrum. The form of the rostrum likewise separates 

 it from jEgeon sculptus, which has been by some looked on as merely made up 

 of specimens of this species with the spines worn off by the action of tlie gas- 

 tric juice of fishes ! ! Having had that species in hundreds alive, I can posi- 

 tively assert the falsity of this idea. 



