Iredale. — Neiv Zealand Marine Moll-uses. 379 



Acmaea parviconoidea leucoma, Suter. 



Acmcea parviconoidea, var. leucoma, Suter, Proc. Mai. Soc, 

 vol. vii, p. 322, 1907. 



Shells answering to this description occur under stones in 

 Dunedin Harbour ; they agree with shells collected in Heath- 

 cote Estuary. I should consider this variety better placed 

 under A. septiformis, Q. and G. 



Acmaea daedala, Suter. 

 Acmcea daedala, Suter, Proc. Mai. Soc, vol. vii, p. 323, 1907. 



The commonest form of this species is a pale-green shell* 

 tessellated as the type. It is common at Shag Point, Otago, 

 and near Cape Saunders, Otago Peninsula. Associated with it 

 at these two localities is the subspecies subtilis, Suter. When 

 alive this subspecies is very pale green, the colour fading to 

 greenish-white when the animal is dead. With these two, at 

 Shag Point, Otago, occurs a third variety : this is dark-brown, 

 unicoloured, agreeing with the type in everything save colora- 

 tion. 



Shells dredged on dead shells in Lyttelton Harbour which 

 may be referable to this species have a very different colora- 

 tion. The sculpture is very similar, and they are transparent. 

 They are whitish, with green thick radiating rays, about 7 to 

 9 in number. Others are whitish dotted with red, the border 

 margined with red lines. 



Acmaea scapha, Suter. 

 Acmcea scapha, Suter, Proc. Mai. Soc, vol. vii, p. 324, 1907. 



I have this shell from shell-sand collected at Blind Bay,. 

 Nelson. 



Acmaea pseudocorticata, n. sp. 



Shell small, conical, elongate-oval, sides almost parallel, 

 closely ribbed, greenish, with brownish markings between the 

 ribs, margin almost entire. The sculpture consists of about 

 17 ribs in the young shell up to 30 in the older shell, due to 

 divarication. Apex situated at about the anterior third to sub- 

 central ; almost always eroded, so that the sculpture is only 

 distinct on the lower half of the older shells. Margin entire or 

 feebly denticulate ; very irregular in some specimens, due to 

 , their station. The coloration of the outside is constantly greenish, 

 the interstices between the ribs brownish. The spatula is dis- 

 tinctly marked, of a pinkish colour ; below is a darker shade 

 of pink ; the margin is white, marked with bluish-black lines 

 corresponding to the interstices between the ribs. This colora- 



