SUTEE: ACMiEID^ OF NEW ZEALAND. 317 



Hah. — Near Bounty Islands, in ,50 fathoms. I am indebted to 

 Captain J. Bollons for the specimens. 



This species has more equal, equidistant, and finer riblets than 

 A. ruhiginosa 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 sharplj^ defined, uniformlj^ dark-brown 

 spatula is characteristic. It is probable that the shells were washed 

 down from shallower water, as all of them were empty and more or 

 less worn. 



4. ACM.EA EOSEORADTATA, U.Sp. PL XXVII, FigS. 9-10. 



Shell very small, oval, conical, with broad pinkish radiate rays. 

 The sculpture, which only a good lens will reveal, consists of twenty 

 very indistinct low riblets on the lower half of the shell, each bordering 

 one of the pinkish rays ; upper half with about twice the number of 

 microscopic, subobsolete, radiate stria3. The colour of the upper half 

 is light pinkish-brown, of the lower part white, with 10 broad radiate 

 pinkish rays, unequally distanced. Apex sharply pointed, very little 

 in front of the centre. Inside having the central area pinkish, slightly 

 lighter - coloured in the middle ; border rayed with pink like the 

 outside; margin sharp. Length 3'5, breadth 2-5, height l'5mm. 



The dentition is unknown. Type in my collection. 



Jlah. — The type is from 18 fathoms, Port Pegasus, Stewart Island, 

 dredged by Captain J. Bollons, to whose great kindness I owe my 

 specimens ; Dusky Sound, South Island, 30 fathoms (R. Henry) ; 

 Tanmaki Island, west coast of the South Island, 10 fathoms (Captain 

 J. Bollons). 



This pretty little shell is well characterized and quite distinct from 

 all the other known Xew Zealand species of the genus. 



The four species enumerated seem to form a natural group of the 

 subgenus. The shells are nearly white, opaque, but little coloured. 

 Tlie dentition of A. cingulata is typical, and it may be assumed that it 

 is very similar in the other species, roseoradiata perliaps excepted. 



All the following species of the subgenus have, with a few exceptions, 

 struugly coloured shells, which are sometimes pellucid, and the teeth 

 have hamate cutting-points. There are only three species of which 

 I was unable to examine the radula. These species conveniently form 

 a st'cond group. From the figures supplied it will be seen that for 

 this group the character of the radula can hardly be used for separating 

 the different species. 



5. AcM^A FRAGiLis (Chcmuitz). PI. XXVII, Fig. II. 



Patella fragilis, Chemnitz: Conch. Cab., vol. xi, 1790, fig. 1921. 

 Patelloidea fragilis, Quoy & Gaimard : Voy. Astrolabe, Zool., vol. iii, 



1834, p. 351, pi. Ixxi, figs. 28-30. 

 Lottia fragilis, Chemn. : Gray in Dieffenbach's N. Zeal., vol. ii, 1843, 



p. 240. 

 Tectura fragilis, Quoy: Hutton, Cat. Mar. Moll. X. Zeal., 1873, p. 43; 



von Martens, Crit. List, 1873, p. 35. 



