852 PELECYPODA. [Filibranchia. 



near low-water mark to 25 fathoms ; Foveaux Strait, in 18 fathoms ; 

 Stewart Island ; Chatham Islands ; Kermadec Islands (Captain 

 Bollons). 



Fossil in the Eocene, Miocene, and Pliocene of New Zealand, Tas- 

 mania, Victoria, and South Australia. 



2. Glycymeris modesta, Angas, 1879. Plate 51, figs. 8, 8a. 



Axincea modesta, Angas, P.Z.S., 1879, 418, pi. 3i5, f. 4. Pec.tunculus striatularis, 

 Lamarck : Mutton, C.M.M., 80 ; J. de Conch., 1878, 53 ; M.N.Z.M., 

 163 ; P.L.S. N.S.W., ix, 528. Glycymeris striatularis, Lam., Index, 94 ; 

 not of Lamarck. G.velutini, Suter, T.N.Z.I., xl, 1907 (1908), 354, 

 pi. 30, f. 1,2. 



Shell small, rounded-triangular, solid, moderately convex, finely 

 radially ribbed, with zigzag or radial brown streaks, equivalve and 

 subequilateral. Beaks central, slightly curved forwards, close together, 

 small, and low. Anterior end with the dorsal margin descending, 

 nearly straight, slightly angled on meeting the basal margin ; pos- 

 terior end with the dorsal margin sloping, but more convex, rounded 

 on meeting the basal margin, which is regularly convex. Lunular 

 area slightly flattened. Sculpture consisting of numerous close and 

 fine radial riblets, about 9 per millimetre on the centre of the valves, 

 crossed by very fine dense concentric striae. Epidermis brown, horny, 

 persistent near the margins, velvety, beset with numerous fine short 

 bristles. Colour whitish or yellowish-brown, with reddish-brown zig- 

 zag or radial streaks, which, however, are usually very faint in speci- 

 mens from deep water. Interior white, porcellanous, faintly radially 

 striate, sometimes stained with dark brown on the anterior lower 

 end. Basal margin very prominently crenate. Hinge-plate broad and 

 rather high, its upper margin horizontally straight, the lower margin 

 regularly concave ; teeth numerous, interrupted in the middle, more 

 or less hooked, decreasing in size distally, finely pectinated. Ligament 

 external, thick, amphidetic. Anterior adductor-scar slightly smaller 

 than the posterior. Pallial line simple, well marked. 



Length, 24 mm. ; height, 22 mm. ; diameter, 12-5 mm. (type). 



Type in the British Museum. 



Hab. Throughout New Zealand, from below low-water mark to 

 about 40 fathoms. Bay of Islands ; Hauraki Gulf, in 25 fathoms ; 

 Cuvier Island, in 38 fathoms ; Tauranga ; Nelson ; Akaroa Harbour ; 

 Otago Peninsula ; Taumaki Island, in 10 fathoms ; Kermadec Islands 

 (Captain Bollons). 



Remarks. Regarding this species Mr. C. Hedley, Sydney, sent me 

 the following information : " Dr. Lamy, Paris, considers G. velutina, 

 Sut. == G. modesta, Angas, 1879. He compared a specimen I sent him 

 AVI tli one he had from the British Museum, so it seems all right. The 

 ' original ' locality is Australia, which is wrong, and put us off the 

 track." 



Fossil in the Pliocene. 



