180 MANUAL OF THE MOLLUSCA. 



The shells of this family are chiefly extinct, ranging from the period of 

 the coal strata, and attaining their greatest development in the cretaceous 

 age. Tornatella is essentially related to Bulla, but presents some resem- 

 blance to the Pyramidettida in its plaited and operculated aperture; in 

 Tornatina the nucleus, or apex, is sinistral. The spiral striae which orna- 

 ment many of the species, are punctate, as in the Bullidse ; and the outer 

 lip often remarkably thickened, as in Auricula. 



TORNATELLA, Lamarck. 



Type. T. tornatilis, PL XIV. fig. 1. Syn. Action, Montf. (not Oken), 

 Dactylus (solidulus) Schum. ? Monoptygma (elegans) Lea, 



Shell solid, ovate, with a conical, many- whirled spire ; 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 behind them, 

 near their inner bases; foot oblong, lateral lobes slightly reflected on the 

 shell. Lingual teeth 12.12, similar, with long simple hooks. 



Fig. 103. 



Distr. 16 sp. U. States, Brit. Senegal, Red Sea, Philippines, Japan, 

 Peru. T. tornatilis inhabits deep water, ( 60 fms. Forbes). 



Fossil, 70 sp. Trias Lias . N. America, Europe, S. India. 



Sub-genera, Cylindrites (Llhwyd) Lycett. C. acutus, Shy. PI. XIV. 

 fig. 2. (A.) Shell smooth, slender, sub-cylindrical, spire small, aperture long 

 and narrow, columella rounded, twisted, and directed slightly outwards. 

 (B.) Shell oval, spire sunk, whirls with acute margins. Bath Oolite, Brit. 



Acteonina, D'Orb. Tornatellse "without columella plaits," 30 sp. 

 Garb. Portlandian, (including Cylindrites). 



Acteonella, D'Orb. A. Renauxiana, PI. XIV. fig. 3. Shell thick, cone- 

 like or convoluted, spire short or concealed, aperture long and narrow, colu- 

 mella with 3 strong and regular spiral plaits in front. Distr. 11 sp. Chalk; 

 Brit. France. 



Acteon Cabanetiana, D'Orb. (Itieria, Matheron, 1842) Coral-rag, France, 

 belongs to the genus Nerinea (D'Orb.) p. 129. 

 CINULTA. Gray. 



Type, C. avellana, PL XIV. fig. 4. Syn. Avellana and Ringinella, D'Orb. 



Shell globular, thick, spirally groved and punctate, spire small ; aperture 



