SPHJIROMA HOOKERl. 411 



surface of the tail bicarinated, as mentioned in the spe- 

 cific character given above. 



Mr. A. White states that the Rev. Alfred Norman had 

 found it at Clevedon, and in Guernsey. 



We have not been able to discover the type specimens 

 of this species in Dr. Leach's collection in the British 

 Museum, and give the above characters from his descrip- 

 tion. The accompanying figure is taken from specimens 

 which we have no doubt belong to this species, and which 

 were captured by the late Mr. W. Thompson in Belfast 

 and Strangford Loughs.* These are more elongated than 

 Sph. serratum, and the upper surface of the body is 

 slightly granulated on the posterior segments, as well as 

 the tail, the last segment of which bears two well-marked 

 carinas, not quite parallel, the extremity of the segment 

 being rather flattened, elongated, and rounded at the tip, 

 without any trace of notch at the sides. The two plates 

 of the lateral appendages of the tail are elongate-ovate, 

 and entire. They extend backwards as far as the pro- 

 duced extremity of the terminal segment. 



Whilst this sheet has been going through the press we 

 have received specimens of this species from Mr. Slade, 

 who found them at Bexhill, near St. Leonard's, in 

 brackish water affected by land drainage. 



* One of these individuals, labelled Belfast, is mLxed up with specimens 

 of S. serratum in the British Museum collection. 



