318 PROCEEDINGS OF THE MALACOLOGICAI, SOCIETY. 



Acmeafragilis, Chemn. : Hutton, Man. N. Zeal. Moll., 1880, p. 88; 



Proc. Linn. Soc. N.8. Wales, vol. ix, p. 374 ; Pilsbry, Man. 



Conch, (1), vol. xiii, p. 59, pi. xxxvii, tigs. 14-15; Hutton, Index 



Faunae Nov. Zeal., p. 85. 

 Patella xmgim-ahncc, Lesson: Voy. Coquille, ZooL, vol. ii, 1830, p. 420. 

 Patella Solandri, Colenso : Tasm. Journ. Nat. Sci., vol. ii, 1844, 



pp. 226, 250; Trans. N. Zeal. Inst., vol. xiv, p. 168. 

 Shell ovate, flattened, membranaceous, pellucid, with concentric 

 bands of brown and greenish-white, the whole surface being sculptured 

 by exceedingly tine, close, subequidistant radiate striae, cut up into 

 minute oval nodules by incremental lines. Colour dark brown, lighter 

 near the apex, banded with narrow white or light-green concentric lines. 

 Apex anterior, submarginal, exactly in the middle line, sharply pointed 

 and directed forward. Inside with an emerald ring around the muscle 

 impression, margin sharp, with a brown border ; spatula showing the 

 concentric bands of the dorsal part of the shell, and having an elongated 

 patch of light emerald in the centre. 



Length 15, breadth 12, height 2 mm. 



17, ,, 13, ,^ 2-25 mm. 

 Dentition (Fig. 11) : The two central and the two anterior, inner 

 lateral teeth are hamate, the outer posterior two laterals small and 

 conical. A paper on the anatomy has been published by M. A. Willcox 

 in Jenacr Zeitschr., vol. xxxii, 1898, pp. 411-456, pis. xvii-xix. 



Hah. — Throughout New Zealand and at the Chatham Islands, under 

 stones between tide-marks. It is local in its distribution and one of 

 our most constant species. 



6. AcM^A sEPTiFOKMis (Quoy & Gaimard). PI. XXVII, Figs. 12-14. 

 Patelloidea septiformis, Q,. & G. : Voy. Astrolabe, ZooL, vol. iii, 1834, 



p. 362, pi. Ixxi, figs. 43-44. 

 Acmcea septiformis, Pilsbry: Man. Conch. (1), vol. xiii, p. 55, 



pi. xxxvii, figs. 93-94. 

 Acmcea scahrilirata, Angas: Proc. Zool. Soc, 1865, p. 154; Pilsbry, 



t.c, p. 56. 

 Acmcea Petterdi, Ten. -Woods : Proc. Roy. Soc. Tasm., 1876 (1877), 



p. 155 ; Pilsbry, t.c, p. 54. 

 Pritchard & Gatliff (Proc Eoy. Soc. Vic, vol. xv (n.s.), p. 195), 

 following Tenison- Woods, take A. cantharus, Reeve, as a synonym of 

 the species, but I cannot agree with them. Reeve's species I take to 

 be precinctive to New Zealand. 



Shell oval, conical to depressed, radiating riblets distinct or nearly 

 obsolete, sometimes tessellated with green and white. The sculpture 

 is very variable ; typically the shell is delicately radiately striated, 

 but then specimens occur which have acute, distant, and slightly 

 granulose radiating riblets, whilst others show almost no trace of 

 sculpture. The colour is brown, tessellated with green or white, but 

 uniformly dark-brown examples are also met with. The apex is at 

 about the anterior fourth, but very often submarginal or even marginal; 

 it is pointed forward and obtuse. Inside blue or whitish, lineolate 



