CONCHOLOGY. 135 
11, Genus T'riton. Pl. XI. 
Animal. As above. 
Shell. Oval with straight spire and canal, middling generally 
wrinkled, furnished with varices, rare, scattered, and preserved in 
longitudinal rows; aperture suboval, elongated, terminated by a 
short open canal; the columellar edge less excavated than the 
right and covered by a callosity; operculum horny, oval, round, 
and rather large. Found in the Northern and Mediterranean 
seas. Thirty-one living species. Three fossil. 
Triton variegatum. Triton tripus. 
T. lampas. T. clavator. 
T. corrugatum. T. chlorostomum. 
T. lotorium. T. subdistortum. 
T. cynocephalum. T. clandestinum. 
T. retusum. T. dolarium. 
T. vespaceum. T. australe. 
T. clathratum. T.. Splengleri. 
T. maculosum. T. pileare. 
T. cutaceum. T. pigrum. 
T. undosum. T. canaliferum. 
T. nodiferum. T. tuberosum. r 
T. scorbiculator. T. anus. 
T. succinctum. T. cancellatum, 
T. femorale. T. rubecula. 
T. tranquebaricum. 
FAMILY XVIII. 
Auata. Three genera. 
1. Genus Rostellaria. Pl. XI. 
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- 
