NO. 1139. DEKr-W.lTKH MOLLUSC A VERRILL A\I> Hl's/f. 783 



which appear in some .places to extend beneatli the upper edge of the 

 ridges: on the umbos and posterior rostrum these ridges and grooves 

 become feeble and irregular, like lines of growth. Internally tin 1 sur- 

 face is white and smooth, with the muscular scars rather strongly 

 marked. 



The hinge-margin is rather thick; in the right valve there are two 

 strong, prominent, curved, cardinal teeth, separated by a large, some- 

 what oblique notch which extends upward into the beak; the posterior 

 tooth is the narrower and more prominent, with the tip curved forward 

 and upward; the anterior tooth is connected, just in front of the beak, 

 by a bridge-like extension to the external margin, leaving between the 

 tooth and the margin a deep submarginal groove; the inner edge of 

 the hinge-margin is a little thickened to form a ridge continuous with 

 the anterior tooth. In the left valve there is a distinct notch under 

 the beak for the cartilage or resilium; in front of this is a prominent, 

 tooth like thickening of the margin of the shell, the proximal end of 

 which becomes tooth like, but is continuous with the rest of the hinge- 

 margin; behind the notch there is no tooth and the margin is only a 

 little thickened, without any special prominence. 



Length, about 2 mm.; height, 1.4 mm. 



Two valves, station 2307, off Cape Hatteras, Xorth Carolina, in 43 

 fathoms, 1884. 



TELLIMYA FERRUGINOSA (Montagu). 



(Plate XC, figs. 1, 8.) 



Tellimya ferruginosa H. and A. ADAMS, Genera Recent Moll., II, p. 479, 1858. 

 Montacitta ferruginosa JEFFREYS, British Conchology, II, p. 210, 1863; V, p. 178, 



pi. xxxi, fig. 9, 1869. 



TeUiinya ferrtiyhioaa (i. O. SARS, Mollusca Reg. Arcticre Norvegia-, p. 70, pi. 20, 

 figs. 1, a-c, 1X78. VERRILL, Trans. Conn. Acad., VI, 225, pi. xxx, fig. 13, 1884. 

 n ferrnt/inosa FiscilEi;, Manuel de Concliyliologie, p. 1027. fig. 775, 1887. 

 i/ti frn-iii/iHosa DALL, Bull. U. S. Nat. Mns., No. 37, p. 50, pi. XLV, fig. 13, 1889. 



A few specimens were found at low-water at Woods Hole, Massa- 

 chusetts (Gut of Canso), and Gutters of Naushon Island, 1882-83. The 

 figure of the living animal published by Yerrill in 1884 has been copied 

 by Ball, Fischer, and others. We now give additional ones. 



KELLIOPSIS, new genus. 



Type. Montacnta eievata Stimpson. 



The shell, in size and form, resembles Kcllla and Montacuta. In 

 both vaives there is a small, prominent, anterior tooth and a low, 

 elongated, thickened posterior ridge, scarcely amounting to a tooth. 

 The resilium is large and is attached to an elongated, oblique excava- 

 tion on the proximal edge of the posterior tooth- like ridge, and also to 

 a triangular pit beneath the beak: it bears a large, elongated, curved 

 ossicle. Soft parts not observed. 



