216 



vol. XV. (n. s.), pt. 2, p. 195; Acmcca cantharus, Beeve, Pilsbry.^ 

 Trvon, Man. Conch., 1891, vol. xiii., p. 55, pi. xxxvii., figs. 1, 2^ 

 Tate and May, Proc. Linn. Soc, N.S.W., 1901, vol. xxvi., p. 412. 

 ■ The type locality is New Zealand. Tate and May list it 

 as a distinct species. Pritchard and Gatliff cite it as a syno- 

 nym of A . s€2)tiformh, Quoy and Gaimard. A shell from Port 

 MacDonnell, collected in numbers, is probably Reeve's shell. 

 A. sevtiformis, Quoy and Gaimard, is also abundant there. 

 The two forms may run into each other, but the intermediate 

 grades have not been taken. It is larger, much less depress- 

 ed, narrower anteriorly, with the apex much nearer the front 

 margin. It is very greatly and roughly eroded, and does not 

 show any radial striae on the uneroded part. The coloura- 

 tion consists of radial brown or back stripes, varying in num- 

 ber and width. Internally they are very dark, a blotchy 

 brown or a uniform blackish brown, lighter or whitish at the 

 summit. The marp^in is articulated brown and white. The 

 muscle scar is very plain as a white horseshoe, and here the 

 shell is translucent, especially at the anterior part. Possibly 

 they may be senile examples of A. sevtiformis, though their 

 marked erosion contrasts strongly with the usually well-pre- 

 served surface of these. 



Family FISSURELLID^. 



Genus Emarginula, Lamarck. 



Emarginula superba, Hedley. 



Records of the Aust. Mus., 1906, vol. vi., pt. 3, p. 216, pi. 

 xxxvii., figs. 7, 8; type locality, 250 fathoms, east of Port Jackson. 



My specimens have been identified by Mr. Hedley from 

 his type. His shell was bleachd, so to his description the fol- 

 lowing may be added : — Colour light pinkish-brown, deepest 

 over the expanded posterior surface, gradually fading anteri- 

 orly towards the slit. It is deeper in concentric rings, which 

 leave blotches on the bounding lamina of the slit fasciole ; nine 

 are counted in the lower two-thirds. Alternate primary ribs 

 are white from apex to margin, and are separated by one 

 primary and two secondary ribs, which are coloured. The 

 anterior four of thes-e white rays on each side of the slit are 

 separated only by the one rib, the secondaries being absent. 

 The colouring of the shell confirms the propriety of the name 

 ''supsrha.^^ 



Individuals vary. Mr. Hedley's figure is almost uni- 

 formly elliptical. Some South Australian examples are much 

 expanded posteriorly, being broadest on a level with the apex, 

 and thence are attenuated anteriorly. These are also much 

 flatter towards the margin posteriorly than the type. Others 

 are elliptical, but less flat posteriorly than the type, and 



