OTINID.E. 109 



species differs from M. bidentatus in its colour and larger 

 size, its plicated and bristly epidermis, and having the 

 outer lip more or less reflected. The finest specimens 

 I have seen were collected by Mr. Gibbs at Swanage. 

 It varies not only in dimensions, but in the comparative 

 length of the spire, which is sometimes as conical and 

 short in proportion to the rest of the shell as in typical 

 species of Melampus. 



The earliest knowledge we have of M. myosotis is 

 derived from Walker's figure 50. It is the Valuta den- 

 ticulata of Montagu, and in its younger state the Auri- 

 cula ciliata of Morelet. The variety is not only Valuta 

 ringens but V. reflexa of Turton, Auricula tenella of 

 Menke, and Iaminia quinquedentata of Brown. 



Valuta bullao'ides of Montagu, from the Portland 

 Cabinet (my Auricula multivolvis) is a rather common 

 West-Indian species. Baron Ferussac gave me a speci- 

 men which Mr. Bean had sent him as found at Scar- 

 borough ; and M. Cailliaud has lately recorded it from 

 Croisic in the Loire -Inferieure. 



M. pusillus, Gmelin (Voluta triplicata, Donovan) is 

 also West-Indian. Montagu received it from Guern- 

 sey; and Turton's locality is " Paington sands, Torquay. 



a 



Family IV. OTI'NID^. 



Body fleshy, rather large for the shell, within which the 

 animal can scarcely withdraw itself : mantle thick: head pro- 

 boscidiform : tentacles very short, lobular : eyes sessile, one on 

 the centre of each tentacle : foot oval, more or less divided 

 across the middle: respiratory orifice forming a narrow slit 

 on the inner or pillar side of the shell. 



Shell ear-shaped: epidermis thin, closely investing the 

 surface : spire complete, extremely short, lateral, apex intro- 

 verted : mouth very large and open : outer lip plain : opercu- 

 lum none. 



