Anomia.] PELECYPODA. 843 



2. Anomia Huttoni, n. sp. Plate 57, fig. 8. 



Anomia cdectus, Gray: Button, C.M.M., 83; J. de Conch., 1878, 55; 

 M.Z.N.M., 173 ; P.L.S. N.S.W., ix, 63; (2) i, 236 ; Plioc. M., 90 : Index, 

 95 ; not of Gray. 



*S/j<V/ subtrigonal, rather thin, inequilateral and inequivalve, the 

 left valve slightly convex, the right valve flat, with 3 transverse broad 

 and shallow grooves, the foramen moderate, elongate, the processes 

 approaching but not united. Anterior end truncated, posterior end 

 produced, but the outlines of the valves are, of course, variable, as is 

 generally the case in the genus. Sculpture : Left valve with concentric 

 and imbricating lamellae ; no radial sculpture. Colour of the left valve 

 slightly pinkish in the centre, greyish-white towards the margins. 

 Interior pearly, the left valve light purple in the centre, white towards 

 the margins ; left valve brownish-white. Man/ins sharp, lamellar. 

 Ligament of the left valve under the beak, internal, triangular. The 

 left valve with the upper byssus-scar large, triangular, sinuate below ; 

 the lower scar close to it below the anterior end, transversely and 

 angularly rounded ; the adductor-scar of the valves behind the lower 

 byssus-scar, separated from it and the upper byssus-scar by a narrow 

 space, outline subcircular, slightly larger than the anterior scar ; all 

 three scars within a tongue-shaped area bounded by a distinct line. 



Left valve : Length, 51 mm. ; height, 42 mm. ; diameter, 10 mm. 



Type in the Dominion Museum, Wellington. 



flab. Stewart Island ; one specimen. 



Remarks. I was unable to procure a specimen of Gray's species 

 for comparison, but I have no doubt that the New Zealand shell is 

 distinct from that found on the coast of Peru. The species is named 

 after the late Captain F. W. Hutton, F.R.S. 



Fossil in the Miocene and Pliocene. 



3. Anomia undata, Hutton, 1885. Plate 57, fig. 9. 



Aiioinia undata, Hutt., T.N.Z.I., xvii, 1884 (1885), 324. Placunanomia, sp. 

 ind., (.'. Tert. M., 34. Anomia undata, Hutton, Plioc. M., 90, pi. 9, f. 95. 

 A. ct/tceum, Gray : Hutton, C.M.M., 83 ; J. de Conch., 1878, 55 ; 

 M.N.Z.M., 174 ; P.L.S. N.S.W., ix, 532 ; Index, 95 ; not of Gray. 



Shell broadly oval to round, rather thin, especially the right valve, 

 slightly inequilateral, inequivalve, with subparallel undulations on the 

 left valve. Beak small, inconspicuous, median or anterior. All the 

 margins of the left valve rounded. Sculpture of left valve consist- 

 ing of concentric lamellae and broad rather shallow and subparallel 

 grooves, nearly vertical or oblique ; right valve with V-shaped deep 

 impressions. Colour whitish. Interior white, pearly, the impressions 

 of the surface sculpture distinctly visible. Margins of left valve 

 thin, lamellate ; of right valve very thin, indented, and semitrans- 

 parent. Ligament in the left valve in the umbonal cavity, transversely 



