224 Mr. A. Adams on new Species of Acephalous Mollusca 
radiatim suleata, postice producta acuminata et utrinque angu- 
lata, latere antico rotundato ; margine ventrali postice sinuoso. 
Hab. Mud-banks, estuary of the Peh-tang-ho (Lieut. Bul- 
lock). 
Genus Verticorp1a, Searles Wood. 
1. Verticordia japonica, A. Adams. 
V.. testa suborbiculari, cordiformi, convexa, inzequilaterali, sub lente 
granulosa, radiatim valde costata, costis multis subdistantibus ; 
Incurvatis compressis ; marginibus acutis denticulatis; margine 
ventrali valde dentato. j 
Hab. Gotto Islands (71 fathoms), where it lives in clean fine 
sand, particles of which usually adhere to the shell. 
The labial palps are small. The mantle is closed, with the 
exception of a moderate elliptic aperture in front for the passage 
of the foot; the edges are thickened and furbelowed, wide apart 
on each side in front, approximate in the middle, where the 
mantle is closed and extended, and continued posteriorly, form- 
ing a common circular fringed opening, within which are the 
sessile siphonal orifices close together, the branchial larger than 
the anal. The foot is small, triangular, and compressed. 
It has no relation, therefore, with Trigonia, the mantle of 
which is entirely open, and the foot large, long, and geniculate ; 
on the contrary, its position, judging both from the nature of 
the animal and the form of the shell, would seem to be in the 
family Bucardiidee, the animal differing from Bucardia (Isocardia) 
cor in the posterior opening being fringed. 
The shell is very similar in form to the fossil V. granulata of 
M. Seguenza, from Sicily. It is quite different from V. novem- 
costata, Adams and Reeve, from the China Sea, and is the 
largest of the recent species. 
2. Verticordia multicostata, A. Adams. 
V. testa suborbiculari, ineequilaterali, cordiformi, subcompressa, sub 
lente granulosa, pallide fusca aut sordide alba, radiatim costata, 
costis numerosis confertis ; marginibus subrotundatis, simplicibus; 
margine ventrali obsolete dentato. 
Hab. Gotto Islands; 71 fathoms. 
This species, single valves of which only were obtained, is 
distinguished from V. japonica by its compressed form and 
numerous close-set ribs. 
Genus ErvittA, Turton. 
Ervilia japonica, A. Adams. 
E. testa sequivalvi, transversim oblonga, inzequilaterali, clausa, latere 
