120 HISTORY OF BRITISH CRUSTACEA. 



and of almost equal size throughout ; process of third seg- 

 ment very prominent. Colour brown, with a reddish tinge 

 in many places. 



Found by Mr. Thompson in Weymouth Bay. 



Hippolyte Mitchelli, Thompson. — Beak straight, acu- 

 minate, without a spine on the upper portion ; beneath, with 

 a three-toothed keel and a small tooth near the tip. Of a 

 beautiful, clear, dark green. Length sixteen lines. 



Found by Mr. Thompson in Weymouth Bay, in from 

 four to six fathoms water. The Rev. Alfred Norman, in 

 his MS. notes on the British Species, remarks: " I have met 

 with two Hippofytes at Falmouth, in rock-pools at low 

 water, which seem to answer to the description of those 

 which Mr. Thompson of Weymouth has named Mitchelli. 

 The rostrum is toothless above; one specimen has two 

 teeth, and one at the apex below; the other has three 

 teeth, and one at the apex. Although however my speci- 

 mens have no tooth at the base above, yet in the place 

 where I have invariably found the basal tooth in variant, 

 there may be seen a slight rising in the rostrum. I con- 

 sider my specimens to be a variety of varian-s. At the 

 same time, I have never, except in one of these two 

 instances, found a specimen of varians with four teeth 



