186 rROCEEDINGS OF THE MALACOLOGICAL SOCIETr. 



each side. C. empleurus seems somewhat to approach Ischnochiton 

 (or Callochiton'^) pimiceus, Couth., which latter, however, I have not 

 seen. I have nothing to add to Hutton's description, because the 

 type-specimen couhl not be taken to pieces, and the chissification of 

 the species rests only on the character of the girdle-scales, which are 

 very similar to tbose of C. platessa. 



Hah. — Unknown ; but, as already mentioned, most likely Cook 

 Strait. 



ISCHNOCHITON, Gray, 1847. 



Key to SpEciEa. 



Scales of girdle faintly striated, mingled with non-striated scales, Invf/iri/mha. 



All scales of girdle deeply grooved, 3-4 grooves on a scale. Parkeri. 



5. IscnNOCHiTON LONGicYMBA. (Quoy & Gaimard). 



? Chiton lonriici/mha, Elainville : Diet. Sci. Nat., vol. xxx\'i, p. 542. 

 Chiton lomjicijinha, Uuov >& Gaim. : Voy. Astrolabe, Zool. vol. iii 



(1835), p. 390, t. Ixxv, figs. "l-18; Reeve, Conch. Icon., 



t. xix, flg. 125; t. xxiv, fig. 163^. 

 Lepidopleunis longicymha, Blainvillc : Angas, Proc. Zool. Soc, 1867, 



p. 222. 

 Chiton [Lepidopleurus) longicymhiis, Blainville : Hutton, Traus. New 



Zealand Inst., vol. iv, p. 178. 

 Lepidopleurus longicymlus, Blainville : Hutton, Man. New Zealand 



MolL, p. 113. 

 Jsclmochiton longicymha, Quoy & Gaim : Pilsbry, Man. Conch,, ser. I, 



vol. xiv, p. 87, pi. xxii, figs. 58-66. 



The colour of this species seems to be even more variable than that 

 of Ischnochitoyi crispus, from Tasmania and Australia. In the South 

 the variation is less considerable, and large specimens are rare. 

 Examples in the Otago Museum from Auckland Islands and Campbell 

 Island are whitish, from Duncdin blackish. 



Hah. — The whole of New Zealand, but more abundant in the 

 North. 



6. Ischnochiton Parkeei, n.sp. 



LepidopleuruH clrcumvallatus, Reeve : Hutton, Man. New Zealand 

 Moll., p. 113 {non Reeve). 



Shell oblong, highly and angularly arched. Colour very rariable, 

 from horny-yellow to chestnut-brown, mostly darker on the posterior 

 margin of the valves, with more or less predominant black longitudinal 

 stripes, assuming often a triangular shape, closer together or coalescing 

 towards the girdle ; the jugum with only a few or without black 

 markings. Lateral areas distinct, raised, minutely graniilated, and 

 with three to four concentric, flat, impressed ridges, which are some- 

 times crossed by faint radiating riblets, their number being from 8-10. 



