62 AMERICAN MARINE CONCHOLOGY. 
Color whitish, with two bands of pale rufous spots and a rufous 
band near the suture. 
Southern Coast. 
A doubtful species; has not been recently detected. 
Genus MARSENINA, Gray. 
1. M. perspicvua, Linneus. Fig. 107. 
(Heliz.) Syst. Nat., edit. xii. 1260. 167. 
Heliz haliotoidea, Linn. Syst. Nat., edit. xii. 1250. 1757. 
Sigaretus haliotoideus, Lamarck, Anim. s. Vert., vi. 208. 1822. 
Oxynoe glabra, Couthouy, Bost. Journ. Nat. Hist., ii. 90, t. 3, f. 16. 1838. 
Shall small, obliquely ovate, pellucid, white, compressed, 
smooth; aperture very large; whorls two. 
Length 12.5, diam. 10 mill. 
Coast of Massachusetts ; Northern Europe. 
Genus VELUTINA, Blainville. 
Malacol. 468. 1825. 
1. V. tavieaTta, Linneus. Fig. 108. 
(Heliz.) Syst. Nat., edit. xii. 1250. 1767. 
Helix haliototdea, Fabricius, Fauna Greenl. No. 387. 1780. 
Bulla velutina, Miiller, Zool. Dan. iii. t. 101, f. 1-4. 1789. 
Velutina capuloidea, Blainville, Malacol. t. 42, f. 4. 1825. : 
Velutina rupicola, Conrad. Journ. Phila. Acad. Nat. Sci., vi. 266. 1831. 
Shell small oval, very thin and fragile. Whorls three; the 
body-whorl with faint concentric striz; spire slightly raised, 
smooth at the apex. Aperture regularly oval. Epidermis, when 
not abraded, thick and raised, more conspicuous on the concentric 
lines. Dusky brown with numerous revolving raised rufous lines. 
Length 7.5, diam. 6.25 mill. 
Cape Cod, Massachusetts, northwards (Lur.). 
This shell is extremely fragile, seeming to consist principally 
of epidermis. European specimens attain larger dimensions and 
are more solid. 
2. V. ZoNATA, Gould. Fig. 109. 
Invert. Mass., edit. i. 242, f. 160. 1827. 
Shell small, ovate, moderately thin; spire not raised. Whorls 
three; the two upper ones scarcely distinct; suture deeply im- 
pressed, striated with revolving lines and superficial concentric 
furrows. Aperture regularly oval; lip expanded, exceedingly 
