180 Dr. Johnston's Contributions to the British Fauna. 



specimen only, the others are neither of them rare, and there is no 

 reason to believe that they are confined to this neighbourhood, 

 but the similarity in their external form and habits has probably 

 occasioned them to be confounded together, and with others 

 better known. 



An enumeration of such other species of this family as have 

 been detected in this neighbourhood, may) perhaps, prove not 

 uninteresting to the British Zoologist, as illustrative of the distri- 

 bution of our native animals. The Talitriis Locusta and Orchestia 

 liltorea of Leach are both very common. The former affects our 

 sandy shores, the latter gravelly and clayey places at the sides of 

 our river, nor have I observed the species intermixed. The 

 Mcera grossimana and Jassa pulchella of the same author, are 

 neither of them rare ; and the Gam. monoculoides of Montagu 

 occurs abundantly. The arms of this species have dilated ovate 

 hands, the second pair larger than those of the first, and we pre- 

 sume no doubt can exist of its being a true member of the family. 

 The Corophium longicorne is common, during the Autumnal 

 months, in pools of brackish water, left at the sides of the river, 

 on the recess of the tide. Along with it we find, in great pro- 

 fusion, a species of Sphceroma which seems little known. It is 

 probably the S. rugicauda of Dr. Leach, but as I have some 

 doubts on the subject, and as he has given no detailed description 

 of his species, I may be excused for adding the following : 



SpHiEKOMA IIUGICAUDA ? 



Leach, Linn. Trans, xi. p. 369. Edin. Encyclop. vii. p. 405. 

 433. 



Desc. Bodj/ rather more than the third of an inch in length, 

 of a cinereous colour varying a good deal in its intensity, minutely 

 speckled with black dots, often marked with a light-coloured band 

 down the back. The whole body is granulated, the granulations 

 of the caudal segment rather larger than those of the segments of 

 the body. Four antennce seated on a peduncle in front of the 

 head, tapered, four-jointed, the last joint composed of numerous 

 small articulations, with a whorl of short hairs at the origin of 

 each. The internal antennce are about one-half the length of the 



