180 PROCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



obsolete, and the outer surface is dull and eroded. Such specimens 

 are not easily separated from those of A. trigonopsis. 



2. Anomia TRIGONOPSIS, Hutton. 

 Anomia trigonopsis, Hutton, 1877, Trans. N.Z. Inst., vol. ix, p. 598 ; 



Suter, 1915, N.Z. Geol. Surv. Pal. Bull, No. 3, p. 48. 

 Anomia huttoni, Suter, 1913, Man. N.Z. Moll., p. 843 ; Suter, 1914, 



N.Z. Geol. Surv. Pal. Bull., No. 2, p. 34. 

 Anomia undata (not Hutton), Suter, 1913, Man. N.Z. Moll., p. 843. 

 That there are two, but not more than two, recent species of 

 Anomia in New Zealand is the conclusion I have arrived at after 

 studying the material available. The type of A. huttoni, and the 

 specimen on which Suter has admitted, A. undata, as a recent species 

 (Man. N.Z. Moll., p. 843), are in the Dominion Museum. There is 

 no difference by which they can be separated. Suter's figure of 

 A. undata (pi. 57, fig. 9) is not the recent specimen, but, judging by 

 •the measurements, is that of the type, a Pliocene fossil. A. undata 

 is a distinct species so far only found fossil in the Pliocene. I am 

 unable to distinguish A. trigonopsis of Putton, as represented by 

 Suter's plesiotype in the collection of the Geological Survey, from 

 the recent shells in the Dominion Museum. This being the earliest 

 name, I apply it to all the recent examples of Anomia from New 

 Zealand except A. walteri. As a species, A. trigonopsis may be defined 

 as being irregular in form, with moderately thick valves with a 

 pinkish sheen. The left valve has irregular, more or less concentric 

 plications, striae, and lamellae, but no distinct radial ribs. The 

 relative position of the muscular scars and the shape of the disc 

 varies with the shape of the shell and affords no diagnostic characters. 

 The lower byssal scar, however, is not relatively large, as in ^. undata. 

 The range of A. trigonopsis is from the Miocene to recent. 



3. MoNiA FURCATA, Suter. 



Anomia furcata, Suter, 1907, Trans. N.Z. Inst., vol. xxxix, p. 262, 

 pi. 9, figs. 9, 10 ; Suter, 1913, Man. N.Z. Moll., p. 842, pi. li, 

 figs. 6, 6a. 

 My attention was first drawn to the wrong classification of this 

 species in Suter's Manual by Mr. Marwick, who suggested that by 

 the sculpture it should be a Monia. We then examined the type 

 and found the characters of that genus, namely, only two muscular 

 scars, of which the byssal was radiately striated. The examination 

 of further specimens confirmed this. Suter has figured three 

 muscular scars and also described the characters of three, but only 

 two exist. He further states (Trans. N.Z. Inst., vol. xxxix, p. 263, 

 1Q07) that of a number of left valves obtained only one showed the 

 muscle scars distinctly. In this, apparently, he was also mistaken. 

 The species is found commonly in Hauraki Gulf, at depths of about 

 25 fathoms, attached to the shells of Pinna zelandica. Specimens 



