GASTEROPODA, 313 
aperture long and warrow; columella plaited; sometimes 
operculated. 
Animal with a flattened, disk-like head, and broad obtuse 
tentacles ; foot ample, furnished with lateral and operculigerous 
lobes. 
The shells of this family are chiefly extinct, ranging from the 
period of the coal strata, and attaining their greatest develop- 
ment in the cretaceous age. Tornatella is essentially related to 
Bulla, but presents some resemblance to the Pyramidellide in 
its plaited and operculated aperture ; in Jornatina the nucleus, 
or apex, is sinistral. The spiral striae which ornament many 
of the species are punctate, as in the Bullide; and the outer 
lip often remarkably thickened, as in Auricula. 
TORNATELLA, Lamarck. 
Type, T. tornatilis, Pl. XIV., Fig. 1. 
Synonyms, Acteeon, Montf. (not Oken), Dactylus (solidulus), 
Schum. ? Monoptygma (elegans), Lea. 
Shell solid, ovate, with a conical, many-whorled spire; 
Fig. 137. 
spirally grooved or punctate-striate ; aperture long, narrow, 
rounded in front; outer lip sharp; columella with a strong, 
tortuous fold; operculum horny, elliptical, lamellar. 
Animal white; head truncated and slightly notched in front, 
furnished posteriorly with recumbent tentacular lobes, and 
small eyes near their inner bases; foot oblong, lateral lobes 
slightly reflected on the shell. Lingual teeth 12.12, similar, 
with long simple hooks. 
Distribution, 16 species. United States, Britain, Senegal, 
Red Sea, Philippines, Japan, Peru. I’. tornatilis inhabits deep 
water—60 fathoms. (Forbes.) 
Fossil, 70 species. Trias—Lias—. North America, Europe, 
South India. 
Sub-genera. Cylindrites (Llhwyd), Lycett. C. acutus, Sby. 
Pl. XIV., Fig. 2. (A.) Shell smooth, slender, sub-cylindrical, 
spire small, aperture long and narrow, columella rounded. 
P 
