188 TORNATELLINA. 



Section ELASMATINA Petit. 



Strobilus ANTON, Verzeichniss der Conchylien welche sich 

 in der Sammlung von Hermann Eduard Anton befinden, p. 46 

 (as a submenus of Clausilia). Not Strobila Sars. ' 'Strom - 

 bilus Alton, 1839," GRAY, P. Z. S., 1847, p. 175, type St. tur- 

 r-itus.Elasmatina PteriT, P. Z. S., 1843, p. 2. GRAY, P. Z. 

 S., 1847, p. 175, type E. sululata. 



The shell is very long, slender, turrited or conic, composed 

 of 9 to 10 flattened whorls; aperture armed with a strong 

 parietal lamella; columella simple or lamellate. Type T. tur- 

 rit a Anton. 



Both Strobilus and Elasmatina, as instituted by Anton and 

 Petit respectively, were heterogeneous groups, comprising 

 elongated, conic and globose species; but Gray, in his "List 

 of the genera of recent mollusca, their synonyma and types," 

 P. Z. S., 1847, fixed upon the first species of each, 8. turrit us 

 and E. subulata, as the sole types of these groups. Since these 

 two names were applied to one and the same species, the two 

 supposed genera must be united. 



We do not know that the locality of T. turrita has been veri- 

 fied by specimens collected since Anton's original lot. This 

 is rather important on account of the uncertainty of some of 

 the habitats given by him. T. turrita, T. reclusiana, T. conica 

 and T. trochiformis agree in having numerous whorls and 

 similar apertural lamella 1 , and it seems likely that all belong 

 to the same group. T. trochlcaris, no. 35, also resembles these 

 species, except that it has fewer whorls. Its locality is un- 

 certain. Tt may possibly turn out that T. turrita is from Juan 

 Fernandez, and not from Opara. T. bilamellata differs from 

 the shells under consideration by having a pair of palatal 

 plicae, but its relations to the other species have not been 

 determined. Having none of these species at hand, we can- 

 not formulate a definite classification. 



48. T. TURRITA (Anton). PI. 53, fig. 15. 



Turrited, elongate, of 9 narrow whorls, the last a little 

 larger than the penultimate, moderately convex ; suture deep. 

 Aperture acutely oval with a lamella on the columella. Thin, 



