SPHHROMA HOOKERI. 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 
carine, 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 mixed up with specimens 
of S. serratum in the British Museum collection. 
