52 CORBULID^. 



contained in an oval pit, which projects obliquely inwards ; 

 the cartilage is held together by a calcareous band or ossicle, 

 placed as in Lyonsia, which is easily split and broken in two 

 when the valves are separated ; it then curls up, so that each 

 half resembles the shelly appendage peculiar to Thracia : 

 hinge-line straight : hinge-plate moderately broad : teeth, a 

 lateral in each valve, which is triangular, erect, and rather 

 long in the right valve, ridge-like and slight in the left : inside 

 glossy and nacreous, obscurely striated lengthwise : scars in- 

 distinct. L. 0-45. B.0-8. 



HABITAT : East coast of Shetland, 40 miles off the 

 land, in 76 f., soft and muddy sand ; a right valve only, 

 with living specimens of the common kind, N. cuspidata. 

 The foreign localities are, Bergen, among Oculina pro- 

 lifer a (Spengler) ; other parts of Norway, at various 

 depths from 10 to 130 f. (Loven, Asbjornsen, Danielssen, 

 and Sars) ; Sweden, 20-60 f. (Loven and Malm) ; 

 Gulf of Lyons, 80-100 f. (Martin) ; Toulon (Thor- 

 rent) ; Genoa (J. G. J.) ; Naples, 30-40 f. (Tiberi) ; 

 Sicily (Philippi); and ^Egean, 110-150 f. (Forbes), 

 The N. Chinensis of Gray, from Mr. Hinds's explorations 

 in the East Pacific, is closely allied to this species, if not 

 identical with it. 



This is a larger and stronger shell than N. costellata, 

 much more elongated in proportion, and has a different 

 kind of sculpture. 



It is apparently the Anatina longirostris of Lamarck, 

 and Corbula cuspidata of Brown, as it is certainly the 

 N. attenuata of Forbes, and N. renovata of Tiberi. I 

 have examined the types of these last two, as well as of 

 Spengler's species. Of the two figures given by Philippi 

 (vol. i. tab. i. f. 19) that on the left hand represents the 

 present species, and the other (which is drawn partly 

 from imagination) N. cuspidata. 



