6 EDGAR A. SMITH. 
rounded whorls. I am inclined to think that this species, founded on a single shell, 
will eventually prove to be merely the young state of MV. grisea Martens, found at 
Kerguelen Island. 
NEOCONCHA VESTITA. 
(Pl. L, figs. 11-11e.) 
Shell subglobose, rimate, very thin, semi-transparent, pale horn colour, covered 
with a periostracum which invests the entire surface, including the apex, and which, 
when moistened, is thick, but shrinks and seems thinnish when dry. It is produced 
at the upper part of the whorls, a little below the suture, into a series of short 
spines, forming a sort of coronation. Whorls three, very convex and rapidly 
increasing ; the two apical (the periostracum being removed) are whitish, glossy, 
glassy, and finely spirally striated; the last is very large, globose, exhibiting oblique 
lines of growth of periostracum, which are produced over the deep canaliculate 
suture. Aperture broadly pyriform; peristome thin, simple, the columellar margin, 
however, being of a brown colour and somewhat reflexed. 
Greater diameter, 7 millim.; height, 8; aperture, 5°25 millim. long, 4°5 wide. 
The operculum (fig. 11b), is horny, reddish, somewhat triangular, with the outer 
margin curved, the converging sides straight, the nucleus terminal and marked with 
rather coarse, curved lines of growth. 
Off Coulman Island, in 100 fathoms. 
Only a single specimen was obtained. It has the appearance of being the young 
state of a shell that might grow to a considerable size, judging from the large apical 
whorls. When first received, before its removal from the spirit, the periostracum 
was thick and spongy, and enveloped the entire shell, and had the appearance of 
being keeled at the upper part of the body-whorl. 
The foot of the animal has a double margin in front, the tentacles are rather 
short, subulate, with the eyes sessile at their outer bases, and the head is prolonged 
into a long, slender rostrum. Radula (fig. 11c) 2, 1, 1, 1, 2, tapering towards the 
anterior end. Central tooth with a median cusp, and two smaller ones on each 
side ; laterals with three or four cusps, inner marginal tri- or quadri-cuspidate ; outer 
marginal simple, hooked. 
The Rev. H. M. Gwatkin, who very kindly extracted and mounted this radula 
for me, considers that it approaches that of Crepidula and Calyptreea. The character 
of the shell and the presence of an operculum at once separate it from those groups. 
It apparently represents a new generic type, for which I would suggest the name 
Neoconcha. 
TRICHOCONCHA MIRABILIS. 
(Pl. I, figs. 7-7b.) 
Shell depressed, orbicular, umbilicated, thin, light, flexible, covered with a 
yellowish, very hairy periostracum, marked with strong oblique lines of growth, upon 
