132 TORNATELLINA. 



In this peculiar shell the whorls are moderately convex,, 

 though the general outlines of the spire are straight. The 

 surface is distinctly striate, the apex decidedly smaller than 

 in typical Elasmias. The parietal lamella is about two-thirds 

 of a whorl long. The inner half is quite low, but the outer is 

 strongly developed, and has pairs of short lamellae upon its 

 lower face, also some projections above the edge on its outer 

 face. The colurnellar lamella is long, thickened at the edge. 

 Above and below it are quite small lamellae (supracolumellar 

 and intracollumelar) , and the subcolumellar lamella is as 

 strong but not as long as the columellar. Below it there is a 

 very stout lamella, which does not reach far inward, but 

 forms the lower margin of the columellar plate. Above and 

 below the group of columellar lamellae there are deep, narrow 

 sinuses. There are six short, deeply placed, interrupted palatal 

 plicae. The basal lip is thick within. Length 3.7, diam. 3.2 

 mm.; 5% whorls. 



Kuester's figure is copied in fig. 9. Figures 10-12 represent 

 the specimen described above. Former descriptions do not 

 notice all of the apertural lamellae and folds. Tbe apertural 

 lamellae do not all show in a front view (fig. 10). Fig. 12, 

 an obliquely basal view, and fig. 11, view through a hole on 

 the right side of the back, give a better idea of the structure. 



Genus TORNATELLINA Pfeiffer. 



Tornatellina BECK, Index Molluscorum, 1837, p. 80, nude 

 name. Strobilus ANTON, Verzeichniss, 1839, p. 46. Not Stro- 

 bila Sars, 1835, Medusae, or of Sodoffsky, 1837, Lepidoptera. 

 "Strombilus Alton " GRAY, P. Z. S., 1847, p. 175 (type 8. 

 turritus). Tornatellina Beck, PFEIFFER, Symbolae, ii, 1842, 

 pp. 5, 55, 130. GRAY, P. Z. S., 1847, p. 175. PFR., Nomen- 

 clator Hel. Viv., 1878, p. 341. 



The shell is small (usually 2 to 5 mm. long), dextral, ovate- 

 conic or oblong-ovate, imperfefute at all stages of growth, 

 thin, uniform corneous or brown, the surface glossy, faintly 

 marked with growth-lines. Aperture ovate ; parietal lamella 

 median, entering from one-fourth to a half -whorl (very rarely 

 wanting) ; columella sinuous, sometimes lamellate ; outer lip 



