TORNATINA. 191 



Its minuteness constitutes the principal distinctive character of 

 this species. The tubercle which forms the apex is proportionately 

 very large. ($m.). 



T. ISSELII Pilsbry. PI. 22, fig. 33. 



Shell minute, cylindrical, smooth, translucid, whitish ; apex 

 mucronate; spire nearly flat; whorls 3, separated by a distinct 

 suture, the first extremely narrow, the last long, a trifle tapering at 

 the base. Aperture linear, wider below, rounded ; right margin 

 simple nearly straight ; columella short, intorted. 



Alt. 2-25, diam. 1'2 mill. (Issel*). 



Harbor of Suez. 



Tornatina pusilla ISSEL, Mai. Mar Rosso, p. 172, pi. 1, f. 15, 1869. 

 Not T. pusilla Pfr., or of A. Ad. 



T. MUCRONATA Philippi. Unfigured. 



Shell minute, oblong, linear, smooth, surface obsoletely longitu- 

 dinally striated ; spire retuse, produced in a mucro in the middle; 

 whorls 4, deeply plicated at the suture, subcoronated. Aperture 

 narrowly linear above, dilated below, uniplicate; lip straight, a 

 little reflexed in the middle. Alt. H lines. (Ph.). 



Aden (Phil.). 



Bulla mucronata PHIL., Malak. Bl. 1849, p. 22. Tornatina mucro- 

 nata Phil., ISSEL, Mai. Mar Rosso, p. 172. 



This is perhaps the species referred to by Mr. A. H. Cooke as- 

 near to T. knocker i Smith. It evidently belongs to the group of 

 knockeri and isselii. 



T. OLiv.EFORMis Issel. PI. 22, fig. 34. 



Shell minute, thin, cylindrical-oblong, whitish, smooth, shining, 

 slightly subdiaphauous ; the apex a little acute, sinistral ; spire 

 conic ; whorls 4, separated by a channelled suture, the first narrow, 

 flat, the last large, subcylindrical, over three-fourths the altitude, 

 attenuated at base. Aperture elongated, narrow above, dilated 

 below androun ded ; right margin little arcuate, produced, acute ; 

 columella white, callous, at the base uniplicate and a little reflexed. 

 Alt. 4, diam. 1'5 mill. (Issel). 



Gulf of Suez. 



SAVIGNY, Descript. de PEgypte, Coq. ; pi. 6, f. 25. Tornatina 

 olivceformis ISSEL, Mai. Mar Rosso, p. 171, 1869. COOKE, Ann. 

 Mag. K H. (5), xvii, p. 129. 



