Dr. J. Gwyn Jeffreys on Mediterranean Mollusca. 397 



shell is four times as large and cylindrical, and it has the 

 mouth sinuated or notched at the base. 



Odostomia minima, Jeffr. 0. clavula, Loven. O. unidentata, 

 Mont. 0. diaphana, Jeffr. O. fenestrate/,, Forb. 0. 

 Humboldti, Risso. 0. tricincta, Jeffr. 



Odostomia brevicula *, Jeffreys. (PI. XVI. fig. 4.) 



Shell conical, solid, opaque, and glossy : sculpture, 



short, strong, straight, and rather sharp longitudinal ribs, 

 of which there are about a dozen on the last whorl ; they 

 terminate abruptly at the periphery, which is bluntly angu- 

 lated ; the interstices of the ribs have an excavated appear- 

 ance ; under the microscope the whole surface is covered 

 lengthwise with very fine and close-set striae ; the apex is 

 quite smooth and polished : colour clear white : spire short : 

 ichor Is 4 (besides the bulbous and heterostrophe embryonic 

 nucleus) , compressed, and gradually enlarging ; the last is 

 almost equal to half the spire : suture shallow and nearly 

 straight ; mouth oval, pointed at the base : pillar curved : 

 tooth small and indistinct, tubercular, placed on the upper 

 part of the pillar : umbilicus none. L. O'l, B. 0*05. 

 Two specimens, more or less imperfect. 



0. nitens, Jeffr. 0. a cicala, Ph. 0. nitidissima, Mont. 

 Besides undeterminable young and fragmentary young 

 specimens of other species. 



Pyramidella minuscula, Monterosato. 



Eidima intermedia, Cantr. E. distorta, Deshayes, van ? 

 A specimen is intermediate between this species, which is 

 usually (although problematically) regarded as the eocene 

 species, and the variety gracilis, which has been named 

 beryllina by Monterosato. Mr. Watson, who has seen this 

 specimen, considered it E. intermedia ; but, independently 

 of the greater size, the shell of the latter species is less 

 slender and the last whorl is proportionally much larger 

 than the other whorls. E. subulata, Donovan. E. Jef- 

 frey siana, Brusina. 



Eulima acutalis f, Jeffreys. (PI. XVI. fig. 5.) 



Shell forming an elongated pyramid, thin, semitrans- 

 parent, and very glossy: sculpture, none on the surface; 

 but the periphery is encircled by a distinct keel, which gives 



the base an angulated appearance : colour clear white : 



spire long, straight, and sharp-pointed : whorls 7, slightly 

 convex or rounded, gradually enlarging to the last whorl, 



* Somewhat short. t Pointed, 



