IDOTEA ACUMINATA. 395 
instead of each of the joints being rounded at the sides, 
and causing that part of the animal to be wider than its 
tail. 
The eyes are placed in the middle of the lateral 
margins of the head, the anterior-lateral angles of which 
are considerably porrected ; the outer antennez are about 
half the length of the animal, with the flagellum multi- 
articulate and longer than the peduncle. The epimeral 
base of the second, third, and fourth pairs of legs are 
visible dorsally on the anterior-lateral angles of the seg- 
ments to which they respectively belong, whilst they are 
more distinct in the three posterior pairs, and occupy 
the posterior-lateral angles, which are rounded off. The 
tail is narrower than any of the segments of the body, 
and is nearly cylindrical, with the extremity pointed, the 
middle of the back forming a slight ridge. This part of 
the body appears to consist of a single joint, but on 
carefully examining its sides (near the base), traces will 
be observed of two incisions, indicating two obliterated 
basal joints. 
The British Museum specimens are from Dr. Leach’s 
Collection, taken in Devonshire. Mr. W. P. Cocks 
found it in trawl refuse, at Gwyllyn Vase, Falmouth ; 
there are several specimens in fine preservation in 
the Hopeian Collection at Oxford, labelled, “South 
West Coast of England,” and we have received it from 
Cumbray, from Mr. Robertson of Glasgow. 
This species is also given in the List of British /sopoda, 
in the Reports of the British Association for 1860, p. 220. 
