320 PEOCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



fourth of the length, slightly hooked ; anterior slope concave, seldom 

 straight. Inside white or bluish- white, the spatula chestnut brown ; 

 a dark - brown band inside the margin, very often banded with 

 yellowish-brown ; margin sharp. 



Length 20-25, breadth 15-75, height 9 mm. Type. 



,, 28, ,,24, ,, 10 ,, Manukan Coast. 



,, 30, ,, 23, ,, 11 „ Auckland Islands. 



Dentition: Hutton, Trans. N. Zeal. Inst., vol. xv, p. 127, pi. xv, 

 fig. M. The accompanying Figures 15 and 16 are copied from 

 Hutton. 



Hub. — Both main islands of New Zealand ; Bay of Islands 

 (Q. & G.) ; west coast of Manukan (C. Spencer) ; Kawhia (R. 

 Murdoch); French Pass (Q. & G., type); Lyttelton (H. S.) ; also 

 Snares Islands (Captain Bollons) ; Auckland Islands (A. Hamilton) ; 

 Campbell Island (Captain Bollons). 



All the specimens I have found were fixed to rocks in excavations 

 considerably above high-water mark, and protected against rain. 

 There is considerable variation in the form of the shells, some being 

 elongate-oval, others much more rounded ; again, they may be high or 

 much depressed. The situation of the apex is also variable, but in the 

 majority of shells it is marginal. The whitish dots are often small 

 and numerous, or larger, elongate or triangular, and fewer in number ; 

 they may be present only toward the margin or altogether absent. 

 Type in Mus. Nat. Hist., Paris. 



8. AcMiEA CANTnARus (Pccvc). PI. XXVII, Figs. 17-18. 



Patella cantharm, Reeve: Conch. Icon., Patella, 1855, fig. 131. 

 Nacella cantharus, Reeve: Hutton, Cat. Mar. Moll. X. Zeal., 1873, p. 46. 

 Tectura cantharus. Reeve: v. Martens, Crit. List, 1873, p. 35; Hutton, 



Journ. de Conch., vol. xxvi, p. 36. 

 Acmcsa cantharus, Reeve: Hutton, Man. X. Zeal. Moll., 1880, p. 88; 

 Pilsbry, Man. Conch. (1), vol. xiii, p. 55, pi. xxxvii, figs. 1-2; 

 Hutton, Index Faunae Xov. Zeal., p. 85. 



Shell small, ovate, thin ; apex anterior, blotched with white. The 

 sculpture consists of fine microscopic radiate striae ; one of my specimens 

 shows a few well-marked distant riblets on the posterior side, but this 

 is an exception ; concentric growth - lines are fairly conspicuous. 

 Colour black or brown, blotched and tessellated with white. Apex 

 very anterior, sharp and hooked; anterior slope concave. Inside 

 light blue, occasionally light brown, spatula chestnut brown ; the 

 sharp margin having a rather broad brown border, often banded or 

 dotted with yellowish-brown. Length 1 7, breadth 13-5, height 4-5 mm. 



Dentition : The Figures 17-18 show two aspects of one row of teeth. 



Ilab. — The type was collected in Xew Zealand by Earl, no exact 

 locality given. The species is represented in my collection from the 

 following localities : Oamaru ; St. Clair, near Dunedin (H. S.) ; Grey- 

 mouth ; Preservation Inlet ; all South Island ; Macquarie Island 

 (A. Hamilton). 



