112 Mr. A. Adams on the Animais of certain Mollusca. 
large and fleshy, is produced behind, and tapering. In outline 
it is ovate ; and there are no papille or cirrhi on the sides. In 
progression, the form of the foot varies considerably, sometimes 
being greatly dilated at the sides, and at others extended in 
front and contracted and pointed behind. 
Genus Tueaxta, Gray. 
The head in this genus, as in other Fissurellide, is rostriform 
and annulated; the tentacles are long and subulate; and the 
eyes, black and prominent, are placed on their outer bases. The 
mantle is double-edged ; the upper edge is reflected over and 
covers a considerable portion of the margin of the shell; the 
lower edge forms a deep plicate curtain, simple on its free de- 
pendent edge. Over the head this free simple margin forms a 
fold, which is received into the emargination at the fore part of 
the shell. Under this curtain, on the side of the foot, is a row 
of tubercles. The foot is strong, of moderate size, ovate, and 
rather produced behind, and is margined along the lower edge. 
The species I have observed is, perhaps, Tugalia parmopho- 
roides or Emarginula parmophorotdes of Quoy. 
From the description it will be seen that the animal most nearly 
approaches that of Scutus; but the shell is more exposed, and 
the tentacular filaments on the side, seen in Scutus, are reduced 
in this genus to tubercles. In Riippell’s figure of 7. elegans, 
Gray (or P. australis, Riipp., not Quoy), the mantle is shown 
covering much more of the shell than in my Japanese species. 
There is an Emarginula figured by Savigny which is very similar 
tomy Tugalia; but the fissure shown in the shell proves it to be 
a true Emarginula. 
Genus Tomicuta, Benson. 
I have discovered two species of Tomichia in the Japan islands. 
In both these the animal is generically the same. 
The rostrum is flattened, bilobed and dilated at the end, and 
conspicuously annulated on its upper surface. The tentacles are 
very short, flattened, and triangular. The eyes are large, black, 
and sessile on the upper surface and outer side of the bases of 
the tentacles, and are surrounded by a light-coloured areola. 
The foot is large, rounded in front and behind, and is divided a 
little before the middle by a transverse groove. 
In crawling, the animal progresses, like Pedipes, by alternately 
advancing the fore part of the foot and bringing up the hind 
part ; the muzzle is also used as an aid to progression, just as it 
is in Truncatella, which genus Tomichia seems most to resemble; 
in fact, judging from an allusion to the animal, I should ima- 
