315 



UKVIEW OF THE NEW ZEALAND ACMiEIDiE, WITH DESCRIPTIONS 



OF NEW SPECIES AND SUBSPECIES. 



By Henry Suter. 



Read \Qlh May, 1907. 



PLATE XXVII. 



Genus ACM^A, Eschscholtz. 



Subg. AcM.icA, s.str. 

 Formula of teeth of radula, 2(1+0 + 1)2. 

 Type, Acmcea mitra, Esch. 



1. AcMJ5A RUBiGiNosA (Hutton). PI. XXVII, Figs. 1-2. 

 Fissurella rubigimm, Huttou : Cat. Mar. Moll. N. Zeal., 1873, p, 42. 

 Patella ruhiqinosa, Hutton: Journ. de Conch., vol. xxvi, 1878, p. 38; 



Man. N. Zeal. Moll., 1880, p. 110. 

 Aemrp.a ruhiginosa, Hutton : Proc. Linn. Soc. N.S. Wales, vol. ix, 



1884 (1885), p. 372. 



Glyphis riibiginosa, Hutton : Pilsbry, Man. Conch. (1), vol. xii, p. 216, 



Aemcea lacimosa, Reeve: v. Martens, Zool. Ilec, vol. x, p. 150; 



Pilsbry, Man. Conch. (1), vol. xiii, p. 63 ; Suter, Trans. N. Zeal. 



Inst., vol. xxxiv, p. 218 ; Hutton, Index Faunae Nov. Zeal., 



p. 85 ; not of Reeve. 



Shell oval, conoidal, white or light rufous, ribbed. The radiating 



ribs are very distinct, rounded, their number very variable ; there are 



from 10 to 20 ribs extending from the apex to the margin, besides 



a number of shorter interstitial ribs, but the total number does 



generally not exceed 30. The encircling growth-lines are fine and 



close together. Colour rufous, with the ribs white ; dead shells are 



pure white, the apex brown. The latter is usually situate at the 



anterior third, sometimes a little nearer the centre ; it is small and has 



the aspect of a callosity filling up a fissurelloid perforation. Inside 



porcellanous, white, with radiating pinkish rays, corresponding to the 



interspaces between the ribs. Central area more or less clouded with 



brown ; margin slightly crenato. 



Length 18, breadth 13, height 6 mm. 

 13, ,, 10, ,, 3 „ 

 The dentition is unknown, and I have never had an opportunity of 

 obtaining an animal of this species. From the character of the shell it 

 may be surmised to be the same as in A. cingulata. 

 Type in the Colonial Museum, Wellington. 



Jiab. — Hitherto only known from the Chatham Islands, but lately 

 dredged in 10 fathoms by Capt. J. Bollons, near Taumaki Island, west 

 coast of the South Island. 



The number of ribs and the height of the shell are very variable. 

 Most specimens have a thick covering of Nulliporites. The habitat of 



