130 PROCEEDINGS OF THE MALACOI.OGICAL SOCIETY. 



generic terms Avill be more helpful in discriminating these difficult 

 shells when dealing with the Australasian forms: Acanthochitona, 

 Cryptoconchus, Cryptoplax, Notoplax, 3Iacandrelliis, and Craspedo- 

 chiton. 



The !Neozelanic shell commonly known as Acanthochites violaceus 

 (Qiioy & Gaimard) would become Macandrellus violaceus (Quoy and 

 Gairaard), and the second Neozelanic species M. tnartte (Webster). 

 Craspedochiton would also be credited with two New Zealand forms, 

 C. riihiginosus (Hutton) and C. cuneatus (Suter). It is a somewhat 

 remarkable coincidence that both these species, at an interval of almost 

 forty years, should have been described as Tonicia, a genus without 

 the slightest resemblance in any Avay to these species. It is exactly 

 parallel with Sykes' reference of a similar shell to Onithochiton, as 

 previously noted. 



Although the genus Tonicia is unknown from New Zealand, I have 

 recorded the existence of a snuill species of Lucilma (^^ Tonicia) at 

 the Kermadecs. 



Some misused Specific Names. 



I pointed out in my last paper (these Proceedings, p. 46) that 

 Pilsbry, in his monograph (^lan. Conch., vols, xiv-xv, 1892-3), did 

 not accept the present usage regarding preoccupied names, and that 

 consequently some alterations were necessary. To those interested 

 I would suggest the following I have noted: — 



On pp. 196-8, vol. xiv, Pilsbry admitted To7iicia elegans, based 

 upon Chiton elegans, Prembly, Zool. Journ., vol. iii, p. 203, 1827 ; as 

 sub-species were included chilennis, Frembl}-, ibid., and lineolata, 

 Frembly, ibid. Ch. elegans, Frembly, is unavailable on account of 

 the prior Ch. elegans, Blainville, 1825, whilst lineolata, Frembly, is 

 also later than Blainville's lineolata, 1825. This would leave the 

 species-name as chilensis, Frembly, 1827, if Pilsbry's association be 



COlTCCt. 



On p. 280 Nuttallina scahra, based upon Ch. scaler, Ileeve, Conch. 

 Icon., pi. xvii, tig. 106, Mch., 1847, must be changed, as Blainville 

 had appropriated that specific name in 1825. There appears to be 

 a substitute ready in Acanthopleura fluxa, Carpenter. On p. 283 

 a Mediterranean shell is called NuttaUi^ia cinerea, Poli, though Poli's 

 species is admitted to be both a mixture and also a misinterpretation 

 of Linne's Ch. cinereus. There can be no reason urged against the 

 rejection of Poli's specific name, but, as Pilsbry pointed out, some 

 authorities have selected caprearnm, Scacchi, 1836, and another 

 crenulatns, Eisso, 1 826. Pilsbry regarded both these as indeterminable, 

 and indicated corrugatus, Ileeve, as the earliest certain name. 



In these Proceedings (vol. ix, p. 91, 1910) I showed that 

 Ch. sulcatm, Quoy & Gaimard, from examination of the type, was 

 the shell commonly known as Ischnochiton decussatus, Ileeve, and, as 

 it had priority, advocated its use. In tliis case also Quoy and 

 Gaimard's name is invalid tlirough the prior Ch.sulcatus, Wood, 1811. 

 I must apologize to my Australian friends who have freely adopted 

 my nomenclature for tlius misleading them, as it is now necessary to 

 revert to the familiar Ileevean decussatus. 



