696 DR. GWYN JEFFREYS ON THE MOLLUSCA OF THE [JuaC 7, 



I/' ScACCHiA tenera', Jeffreys. (Plate LXI. fig. 2.) 



Shell, oval, thin, rather convex, semitransparent, of a dull hue : 

 sculpture, numerous slight concentric striae, besides stronger and 

 irregular hues of growth : colom- whitish : epidermis filmy : margins 

 rounded on all sides, except at the back, where it is uneven : beaks 

 small, circular, projecting beyond the dorsal margin, slightly incUned 

 to one side : hinge-line nearly straight : cartilage-pit small and 

 narrow, placed obliquely under the beak ; hitige-plate rather broad 

 but shght : teeth, in the right valve a small cardinal, in the left none 

 except an angular projection below the beak enclosing the cartilage : 

 inside T^oWshed: sears imperceptible. L. 0-175, B. 0-225. 



'Porcupine ' Exp. 18/0 : St. 3«, 6, 16, \7a. A few valves only. 



An abnormal species of an eccentric genus. 



Decipula^ Jeffreys. 



Shell oval, thin, glossy, completely closed : cartilage triangular, 

 clasping and supporting the hinge : 'teeth, m one valve a minute 

 cardinal, which lies below the beak, and is not easily seen, with a 

 slight lateral on each side ; in the other valve none except a small 

 angular projection of the hinge-plate on the right-hand side. 



^ Decipula ovata, Jeffreys. 



B.ovata (Jeffr.), Friele, Vid. Forh. 1875^ p. 57; G. O. Sars, 

 Moll. reg. arct. Norv. p. 341, t. 34. f. \a~c (as Tellitnya ovalis). 



'Porcupine' Exp. 1869 : St. 18. A single valve. 



Distribution. Lofoten Isles, W. Norway, and Bay of Biscay ; 

 120-552 fms. 



It somewhat resembles Montacuta ferruginosa in shape; but the 

 hinge is generically different. 



Brown's generic name Tellimya is a synonym of Montacuta, and 

 includes Kellia also. The specific name ovali's, given by Prof. G. O. 

 Sars, means belonging to an ovation or triumphal procession ; ovata 

 means egg-shaped. 



u 1 . Montacuta ferruginosa, Montagu. 



My a ferruginosa, Mont. Test. Brit. p. 44, t. 26. f. 5. 



Montacuta ferruginosa, B. C. ii. p. 210 ; v. p. 178, pi. xxxi. f. 9. 



'Porcupine' Exp. 1869: St. 16, 18, 19, 35 (with variety mVm,' 

 which is more regularly oval ; and a longer monstrous valve, of a 

 somewhat triangular shape, in consequence of the posterior margin 

 sloping from the beak on each side instead of being rounded in that 

 part), and off Belfast. 1870 : Atlantic, 6, 9, off Cape Espichel, off 

 C. Sagres, 1 6 (valve of variety nivea, apparently a very old specimen, 

 and having close-set and partly anastomosing marks of'growth), I 7a ; 

 Mediterranean, Algesiras Bay, Adventure Bank. 



Distribution. Greenland {M. Sars) ?, arctic Norway to the Medi- 

 terranean and Adriatic, Mogador, Madeira, New England ; 3-733 

 fms. 



' Tender. 2 A deceiving thing. 



