126 CONCHOLOGY. 



T. cynocephalum. T. clandestinum. 



T. retusum. T. dolarium. 



T. vespaceum. T. australe. 



T. clathratum. T. splengleri. 



T. maculosum. T. pileare. 



T. cutaceum. T. pygrum. 



T. undosum. T. canaliferum. 



T. nodiferum. T. tuberosum. 



T. scorbiculator. T. annus. 



T. succinctum. T. cancellatum. 



T. femorale. T. rubecula. 

 T. tranquebaricum. 



FAMILY XVIII. 



AiATA. Three genera. 



1. Genus Rostellaria. PI. XL 

 Animal. Entirely unknown. 



Shell. Subdepressed, turriculated, with a produced and 

 pointed spire ; aperture oval on account of a rather large excava- 

 tion of the columellar edge, the right margin dilating with age, 

 and having a sinus contiguous to the pointed canal which ter- 

 minates the shell ; an operculum. This genus is distinguished 

 from the Strombus by having a sinus in the lower part of the right 

 margin contiguous to the canal. Inhabits the European seas. 

 Four living species. Three fossil. 



Rostellaria curvirostris. Kostcllaria pespelicani. 



R. recti rostris. R. cancellata. 



. 2. Genus Pteroceras. PI. XII. 



Animal, fee" Strombus, below. 



Shell. Oblong-^vate ; canal elongated, attenuated and often 

 closed ; right margin dilating by age into an expanded digitated 

 wing, attached to and covering a short spire with a sinus in the 

 lower part not contiguous to the body. Distinguished from the 

 Strombus by not having the canal ai the base shortened or trun- 

 cated, and from the Rostellaria, by having the sinus of the right 



