VELUTINIDiE. 199 



Species of Sycotyjms. 



decussatus, Wood. ficus, Lmn. 



Dusumieri, Valenc. gracilis, Phil. 



ficoides, Lam. reticulatus, Lam. 



Fam. VELUTINID.^. 



Tongue armed with a single series of broad, hooked, 

 serrated teeth, flanked on each side by a triple row of 

 laterals, the two outer rows being simple, and the inner 

 row broad, hooked, and serrated. Head broad ; ten- 

 tacles subulate, blunt, far apart, with the eyes on pro- 

 minences at their outer bases. Mantle with the margin 

 developed all round, and more or less reflexed over the 

 shell. Foot lai'ge and oblong. 



Operculum none. 



Shell ear-shaped ; aperture wide, entire in front. 



The operculigerous lobe in this family is developed, in 

 common with the lateral and anterior portions of the 

 mantle, so as to be capable of being reflexed over the 

 sides of the shell. 



Genus VELUTINA, Fleming. 



Shell thin, covered with a velvety epidermis, volutions 

 few, last whorl ventricose, large; spire small, obtuse, sub- 

 marginal, suture deep; aperture very large, patulous, 

 entire ; outer lip acute. 



Syn. Galericulum, Brown. 



Ex. V. laevigata, Linn<Bus, pi. 21, fig. 2. Shell, V. 

 laevigata, fig. 2, a. 



