350 DR. GWYN JEFFREYS ON THE MOLLTJSCA OF THE [May 20, 



stated in ' British Conchology ; ' that is O. neglecta of Tiberi, and I 

 was misled by observing in the collection of the late M. Petit, at 

 Paris, specimens of the present species under the name of O. vitrea. 



16. Odostomia pr^longa \ Jeffreys. (Plate XXVI. fig. 6.) 



Shell obelisk-shaped, thin, semitransparent, and very glossy : 

 sculpture none : colour clear white : spire long and elegantly tapering ; 

 apex or nucleus rather blunt : whorls 10, more or less compressed : 

 suture slight, usually rather oblique : mouth squarish-oval, some- 

 what inflected above and curved below : outer lip thin and flexuous, 

 smooth within : inner lip so filmy as to be scarcely perceptible : 

 umbilicus none : tooth small but distinct. L. 0"275. B. 0"075. 



'Porcupine' Exp. 18/0: Atl. St. 13, 17«, 24,27-30,32-34, 

 36 ; Med. 50, 55, Adventure Bank. Many specimens of various 

 sizes ; those from the Mediterranean are much smaller and more 

 slender. 



From the Adventure Bank Station I have an imperfect specimen 

 and some fragments of apparently another species allied to the 

 present. It has a thick shell with an angular periphery and a 

 straight pillar, a slighter and straighter suture, and a smaller tooth. 

 If more specimens should be found this may be named concinna. 



Distribution. Bay of Biscay ('Travailleur ' Exp. 1880 and 

 1881), Coralline zone, Sciaccha (Monterosato), Algiers (Joly), E. 

 Mediterranean (Nares), off West coast of Africa ('Talisman' Exp. 

 1883); 20-733 fms. 



I noticed this species in the Reports of the British Association for 

 1873, p. 112. If it were not for the conspicuous tooth, it would 

 certainly be placed in the so-called genus Eulimella. 



\/ 17. Odostomia crassa 2 , Jeffreys. (Plate XXVI. fig. 7.) 



Shell cylindrical, remarkably thick and strong, opaque, and 

 glossy : sculpture none, except microscopic lines of growth and the 

 grooves with the outer lip hereafter mentioned, as well as the 

 periphery being slightly angulated : colour ivory-white : spire long 

 and finely tapering : whorls 5 only in the fragments now described, 

 although there would be from 8 to 10 in perfect specimens ; they 

 gradually increase in size and are flattened : suture slight, rounded 

 below : outer lip incrassated, furnished inside with 8 to 10 spiral 

 striae or flutings, like those in O. conoidea,0. tenuis, and O. conspicua, 

 as also in O. costaria and other Crag species : inner lip forming an 

 unusually thick and broad glaze on the pillar : umbilicus none : 

 tooth large, solid, prominent, and winding round the pillar. Largest 

 fragment L. 0-25, B. 0-085. 



'Porcupine' Exp. 1870: Atl. St. 3, 6, 9, 26; Med. Adventure 

 Bank. Many characteristic fragments of as many specimens of 

 this curious species. Its general aspect reminds one of O. scillce ; 

 but the strong tooth and the inside fluting of the outer lip at once 

 serve to distinguish the two species. 



1 Yerv loiif*. ~ Thick. 



