318 HISTORY OF BRITISH CRUSTACEA. 



The head is shaped like a small buckler, and furnished with 

 frontal plates. There is a series of one or more pairs of 

 lamellar appendages, which extend along the back of the 

 thorax. The egg-bearing tubes straight, external. 



Gen. 176. DINEMOUEA * Latr. 



The plate-like appendages covering the thorax are two 

 only. The first three pairs of feet are setiferous ; the pos- 

 terior are foliaceous and membranous. 



The first species here quoted, and figured, with all the 

 others in Dr. Baird's excellent work, when viewed from 

 above, resembles somewhat an undressed doll with the head 

 and neck and part of the legs removed. 



Dinemoura alata, M. Edw. sp. — Oblong ; about half 

 an inch long. Dorsal plates of a chestnut-colour, and with 

 pale, scattered dots. 



Hab. Berwick Bay : on the Beaumaris shark. 



The late Dr. Johnston, of Berwick, first described this as 

 British. He remarks (Loudon's Mag. ]S T at. Hist. viii. 203) 

 that it appears to be parasitical on several species of fish ; 

 and that the creature generally attaches itself to the sides 

 of the branchial covers, and adheres tenaciously, by thrust- 



* Ais, two, urjfia, thread, and ovpa, tail. 



