492 Dr. J. Gwyn Jeffreys on 



Fossil in the Coralline Crag of Suffolk. 



The ' Valorous ' specimen differs somewhat from others. It 

 is more gibbous, its contour is not so oblique, and the hinge- 

 line is nearly straight instead of curved : the cartilage is ob- 

 long and placed obliquely. The hinge shows that this shell 

 belongs to Axinus and not to KelUa. 



Axinus eumyarius^ M. Sars. 



Axinus eumyarius, M. Sars, Christiamafj ordens Fauna, ii. 1870 (post- 

 humous), p. 87, tab. xii. f. 7-10. 



Station 7, 1100 fms. ; one live specimen. Norway, 200- 

 450 fms. (Sars). 'Porcupine' Expedition, 1870, Bay of 

 Biscay, 227-795 fms. ; Mediterranean, 1456 fms. Palermo 

 (Monterosato). 



This species is remarkable for the length and thickness of 

 the adductor muscles, the scars of which are visible through 

 the shell. It somewhat resembles in shape A. croultnensis, 

 but is longer and not oblique, and the beaks are pointed and 

 project much more, so that there is a sloping droop on each 

 side. In some of the ' Porcupine ' specimens the muscular 

 scars are less distinct, although the other characters are the 

 same. 



Axinus mcrassatus^j Jeffr. 



Shell more or less obliquely triangular, moderately con- 

 vex, rather solid, and nearly opaque : sculpture, minute con- 

 centric strise or lines of growth, which become fewer and 

 regular in front : colour whitish : epidermis filmy : margins 

 sloping and curved on the anterior side, rounded in front, and 

 truncate on the posterior side : lunule and corselet indistinct : 

 ligament narrow and yellowish, visible outside : hinge-line ob- 

 tuse-angled : hinge-plate remarkably thick on both sides of 

 the beak, so as to resemble laminar lateral teeth : inside glossy, 

 smooth-edged : scars inconspicuous. L. 0'05. B. 0*075. 



Station 9, 1750 fms. ; 12, 1450 fms. ; 16, 1785 fms. ' Por- 

 cupine ' Expedition, off the north-west of Ireland, 1180 fms. 



A variety which I would name sticcisa was dredged by me 

 in the ' Porcupine ' Expeditions of 1869 and 1870 in the North 

 Atlantic and Mediterranean, at depths of 92-1366 fathoms, 

 and by Dr. Carpenter in the ' Shearwater ' Expedition of 

 1871, off the coast of Tunis, at depths of 40-120 fathoms. 

 In this variety the posterior side is more abruptly truncate in 

 the middle, and the hinge-plate is reflected or folded back on 

 that side instead of being excessively thick. Specimens from 

 moderate depths are larger than the type. 



* Thickened. 



I 



