938 DR. GWYN JEFFREYS ON THE MOLLUSCA OF THE [NoV. 29, 



Syn. N.pellucida of Stimpson, N. ardiniana of Bioiuli?, accord- 

 ing to Monterosato ; var. N, glacialis of G. O. Sars. Not N. obesa 

 of S. V. Wood. 



, 5. Ne^ra cuspidata, Olivi. 



Tellina cusjndata, Olivi, Zool. Adr. p. 101, t. iv. f. 3. 



N. cuspidata, B. C. iii. p. 53, pi. ii. f. 4 ; v. p. 191, pi. xlix. f. .5. 



'Porcupine' Exp. 1869: St. 1, 6, 9, 13, 23a, 25 (var. ewr/fa), 

 55,61,68,69, Little Minch, oif Lerwick. 1870: Atl. 10 (var. 

 curia), 13 (var. curta), C. Sagres, 36 (and var. cur to) ; Med. Capo 

 de Gata, 55 (fragment), G. Bona, Benzert Road, Basel Amoush, 

 Adventure Bank, oif Rinaldo's Chair (and var. acutalis, smaller, 

 running to a point), 



Bisti-ibution, S. Greenland, Spitzbergen, and Finmark to the 

 Jilgean and Adriatic, Madeira, Canaries, China Sea?; 12-733 fms. 



Fossil. Miocene : Vienna Basin, Baden, S. France. Pliocene : 

 Coralline Crag ?, Belgium, Italy. Post-tertiary: Norway, Calabria; 

 0-50 ft. 



{/ 6. Ne^ra GRACILIS ^ Jeffreys. (PlateLXX.fig.il.) 



Shell forming a rather long oval, convex, not very thin, opaque, 

 lustreless ; sculpture, slight and irregular but numerous striae in the 

 line of growth, which become wrinkled towards the rostrum : colour 

 whitish : epidermis slight, caducous : margins rounded on the ante- 

 rior side, gently curved in front ; posterior side or rostrum broad, 

 abruptly terminating, somewhat keeled or angular, and having the 

 striae in this part arranged lengthwise or at a right angle to the con- 

 centric striae ; dorsal margin incurved ; bealcs mamillar, slightly 

 inflected towards the anterior side ; umbones small, but prominent, 

 and projecting behind : cartilage-pit small, oblique, and sunken : 

 hinye-Une raised on the anterior and incurved on the jjosteriur side : 

 hinge-plate folded back on the anterior and thickened on the other 

 side : teeth, a triangular and nearly uj^right lateral, continuous with 

 the cartilage-pit on the posterior side of the light valve : inside 

 glossy: scars irregularly triangular. L. 0*4, B. 0'6. 



'Porcupine' Exp. 1870: Atl. St. 16. A perfect but dead sjieci- 

 meu. 



Differs from N. rostrata in being more compressed, and in having 

 a short, broad, and keeled rostrum, which is not, as in that species, 

 abruptly pinched up and elongated. I should have preferred the 

 specific name elegans for the shell which I have now described ; 

 but it has been used by Mr. Hinds for a species from the ' Sulphur ' 

 Expedition. 



7. Ne^ra rostrata, Spengler. 



My a rostrata, Spengl. in Skrivt. Selsk. iii. p. 42, t. ii. f. 16. 

 N. rostrata, B. C. iii. p. 51; v. p. 191, pi. xlix. f. 3. 

 'Porcupine' Exp. 1869 : St. 1, 6, 10, 13, 14, 18, 25, 61. 1870 : 



^ Slender. 



