, SUTEK : NEW ZEALAND POLYrLACOPHORA. 189 



I have not seen this species, hut cannot share Mr. Pilsbry's opinion 

 that it is identical with P. biramosa. The shape of the valves and 

 sutural lamina) is very different; the divergence is only 110°, whilst 

 it is 150° in P. biramosa. It is no doubt nearer P. subatrata, though 

 specifically distinct from that also. 



9. Plaxiphoka cjlLata (Eeeve). 



Clii'nn ca'lnfns, Reeve: Conch. Icon., t. xvii (1847), fig. 101. 

 Acanthopkura ccelatus, lleeve : Ilutton, Man. New Zealand Moll., 



p. 115. 

 riaxiphora cctlata, lleeve : Pilshry, Man. Conch., ser. I, vol. xiv, 



p. 328, pi. Iviii, figs. 21, 22. 

 Tonicia ziczac, Ilutton: Trans. New Zealand Inst., vol. iv (1872), 



p. 180 ; Pilsbry, Man. Conch., ser. I, vol. xiv, p. 328. 

 Chiton {Plaxiphora) tenninalis (Cpr. MS.), Smith: Voy. "Erebus" 



and "Terror," Moll. (1874), p. 4, t. i, fig. 13. 

 Plaxipltora terminalis, Smith: Hutton, Man. New Zealand Moll., 



p. 116; (Cpr.) Smith, Pilsbry, Man. Conch., ser. I, 



vol. xiv, p. 326, pi. li, fig. 14. 



I have collected a fair number of this species, and on examining 

 them carefully have come to the conclusion that Smith's Chitoyi 

 terminalis is identical with Reeve's C. caiatus. I have two specimens 

 "ornamented with green and pink," but in all other respects they 

 agree with the very good description and figure given by Smith for 

 Plaxiphora terminalis. With regard to Hutton's Tonicia ziczac, there 

 is no possibility of examining the type, which is lost, but on reading 

 his description one is forced to the conclusion that it, too, cannot be 

 anything but Plaxipliora ccetata. Moreover, Captain Hutton himself 

 made his Tonicia ziczac a synonym of the latter in his Man. New 

 Zealand Moll. In Von Marten's Critical List I cannot find any 

 mention that 2\ ziczac is a synonym of P. ccelata, as stated by Pilsbry 

 (Man. Conch., ser. I, vol. xiv, p. 328). 



In his paper on the Polyplacophora from Port Phillip, Mr. E. W. 

 Sykes places Plaxipliora terminalis in the synonymy of P. petholata 

 (antea, p. 90). There is no doubt that the two species show very 

 much the same sculpture, but, omitting minor differences, I would 

 point out that the girdle of P. ccelata ( = terminalis) has very distinct 

 sutural pores with long horny bristles, which are not at all numerous, 

 and the colour of the girdle is usually white, banded with black. 

 The girdle of P. petholata, on the other hand, is dark-brown, and it is 

 densely covered with corneous, or dark-brown bristles, not arranged in 

 series or sutural pores. P. ccelata is a much more elongated form, 

 and very seldom attains such a large size as P. petholata.^ 



1 [Mr. Suter has very kiudly sent me fresh specimens of P. ccelata, and 1 am very 

 glad to have the opportunity of correcting the error into which I tell. The three 

 names for tlie Australian shells appear to helong to one species, P. petholata, and the 

 three names for the Xew Zealand shells to another, P. ccelata. — E. R. Sykes.] 



