64 GASTROPODA. [Aspidobranchia. 



area white, rarely with a small brown spot underneath the apex ; 

 margin indistinctly crenulate, with a narrow pinkish border. 



Length, 17 mm. ; breadth, 

 13 mm. ; height, 6 mm. 



Dentition. --Hutton, T.N.Z.I., 

 xvi, 215, pi. 11, fig. 5. A copy 

 of the drawing is here repro- 

 duced. It is typical, resembling- 

 very much that of A. mitra, 



Esch., with short, stout, conical 



TEETH OP RADULA. 

 cutting-points. 



Type in the Canterbury Museum. Christchurch. 



Hob. Dunedin and Lyttelton (Hutton) ; Lyall Bay (H. S.) ; East 

 Cape Lighthouse. On rocks between tide-marks, not common : fre- 

 quently found on shells of Haliotis. 



Remarks. -Distinguished from is nearest ally, A. rubiginosa, by 

 the more anterior apex, the more numerous and lower ribs, the white 

 interior, and the purplish or pinkish border. Always covered with a 

 thick layer of Nulliporites. 



-. Acmaea intermedia, Suter, 1907. Plate 5, fig. 7. 



Acmcea intermedia, Suter, P. Mai. 8., vii, 1907, 316, pi. 27, f. 6-8. 



Shell oval to subcircular, conoidal, thin, light brown, finely ribbed. 

 The fine, equidistant, equal, rounded riblets number from 25 to 50, 

 interstitial riblets are mostly absent ; a few concentric distinct growth- 

 lines are commonly present. Colour light brown, the riblets white. 

 Apex at about the anterior third, near the centre in subcircular 

 examples ; nucleus very small, oval, dark brown. Inside shining, 

 with the central area dark brown, the border much lighter in 

 colour. 



Length, 7-5 mm. ; breadth. 6 mm. ; height, 2-25 mm. (type). 

 Other specimens measure 11 mm. by 9 mm. by 4'5 mm., and 8 mm. 

 by 6-5 mm. by 3 mm. 



The dentition is unknown. 



Type in my collection. 



Hob. Near the Bounty Islands, in 50 fathoms (Captain Bollons). 



Remarks. This species has more equal, equidistant, and finer riblets 

 than A. rubiginosa and cingulata ; there is an almost constant absence 

 of shorter interstitial riblets ; no rays on the inside and no marginal 

 border are present, and the sharply defined uniformly dark-brown 

 central area is characteristic. It is probable that the shells were 

 washed down from shallower water, as all the specimens I saw were 

 empty, and more or less worn. 



