, 
68 Couthouy's New Species of Mollusca 
chial cirri are round, their color purplish-brown tipped 
with white, arranged in five clusters on a side, 12 or 15 
cirri in each, the middle clusters being rather the largest ; 
foot somewhat broader than the body, its posterior ex- 
tremity tapering gradually to a very fine point, and 
marked on the upper side with a bright azure line in the 
middle, about half an inch in length. Genital and anal 
orifices separate, upon the right side, the first just below 
and behind the anterior cluster of cirri, the latter near 
the back, between the third and fourth clusters. 
Eoris (Cavolina, Brug.) SALMONACEA. 
Plate I. fig. 2. 
E. corpore oblongo, capite lato, tentaculis quatuor, branchiis nu- 
merosis, salmonaceis, lineis longitudinalibus dorso dispositis, pede am- 
plo, supra lacinulato, posticé acuto. 
Length thirty-five twentieths, breadth of foot as ex- 
panded, sixteen twentieths of an inch. 
Hab. same as preceding species. 
Cab. Bost, Soc. Nat. History. 
Description. Body oblong, tapering from the head, 
nearly diaphanous ; color a pale, yellowish-white ; back 
convex, with a conspicuous elevation in the middle, which 
exhibits a pulsatory or respiratory movement; the head 
is large, with two tentacule just above the jaws, and two 
on its upper part, the latter very minutely serrated at the- 
sides ; all four are much thicker and blunter than in the 
preceding species, and of a pale flesh color; the mouth 
is large, shaped like an inverted V ; eyes imperceptible ; 
branchial cirri dorsal, disposed in longitudinal lines to the 
number of one hundred or more, of a most beautiful sal- 
mon color bordering upon orange; they appear to consist 
each of an inner, round cirrus, which is sheathed in an 
