CALYPTRAIDA. F713 
Animal. Head large, transverse, depressed; foot rounded, 
slightly truncate in front. 
Adhering to shells or stones, and modifying their form in 
accordance with their dwelling-place, those species living within 
the aperture of empty spiral shells are generally flat and uncolored ; 
others reproduce the ribs of Pecten; others again attach in 
groups upon the outside of each other’s shells. 
GARNOTIA, Gray. Oval, convex, covered by a smooth epider- 
mis ; apex dorsal, median, posterior; lamina inclined. 
tANAcus, Morch. Shell depressed, apex posterior, but slightly 
lateral; lamina mostly concave in front. C. unguiformis, Lam. 
(Ixv, 92). 
ERGHA, H. and A. Adams. Shell depressed, summit lateral ; 
lamina produced in front, its columellar margin subtubular. C. 
plana, Ads. and Rve. (lxv, 93). 
Norcia, Gray. Shell subcircular or oblong, convex, spiral ; 
whorls one and a half or two; the apex subcentral, subposterior; 
nucleus spiral; cavity concave, deeper under the apex ; internal 
plate concave, thin, with the fold forming a narrow linear cavity 
open to the apex of the shell. N. Chinensis, Gray. China. 
sprrocRYPTA, Gabb. Summit of shell posterior, lateral and 
submarginal, spiral. Internal plate attached to the margin on 
the lower or outer side, curving upwards and inwards and 
uniting with the opposite side at a considerable distance. The 
plate is subspiral, thus approaching Trochita and Galerus. C. 
pileum, Gabb (Ixiv, 78). Cretaceous; Cal. 
GALERICULUS, Seeley. 
Distr.—G. altus, Seeley (lxiv, 79). 
This genus has two separate septa, the larger one originating 
below the incurved apex, and the smaller one at the base. Only 
the cast is as yet known; the upper surface of the shell, which 
has the form of a Helcion, not having been observed. 
Caputus, Montf. 
Bonnet-limpet. 
Syn.—Pileopsis, Lam. Actita, Fischer de Wald. 
Distr.—8 sp. W. Indies, Europe, India, Australia, W. America. 
Fossil, 20 sp. Silurian—. C. Ungaricus, Linn. (1xvi, 30). 
Shell conical, apex posterior, spirally recurved; aperture 
rounded ; muscular impression horseshoe-shaped. 
Tongue-membrane winged on each side in front, teeth arranged 
in seven series (3'1°3), central teeth small and broad with the 
apex hooked, the lateral teeth long and hamate. Rostrum 
lengthened ; tentacles subulate, with the eyes on bulgings at 
their outer bases. Mantle simplein front; gill forming a single 
plume placed obliquely across the mantle-cavity,laminz elongate, 
linear, partly exposed. Foot folded on itself, the sides simple, 
