Iredale. — Sitter's " Manual of the Neiv Zealand Mollusca." 423 



of the radula. My own result was achieved by criticism of the shell cha- 

 racters alone. The slitting in the head-valve is abnormal, four only being 

 counted, instead of the usual five, but in Tonicia the normal is eight. 

 I would emphasize the fact that the generic location must be regarded as 

 temporary only, as I have not seen the unique specimen, and the figure given 

 by Suter is comparatively valueless, showing seven valves only. 



I wish Mr. J. C. Anderson would find some more specimens, but I well 

 know the difficulty of securing these rare stragglers from deeper water. 



Genus Acanthopleura (Guilding). [P. 44.] 

 This, with the species A. granulata, and all the matter connected with 

 them, must be omitted, as this is no constituent of the New Zealand fauna. 

 I have pointed out, as acknowledged in the Manual, p. 1078, that Tonicia 

 corticata Hutton should rank as a synonym of Plaxiphora biramosa (Quoy 

 and Gaimard). The genus Acanthopleura is confined to the tropics, rarely 

 occurring outside these limits. It is absolutely littoral in every portion 

 of its range, though sometimes specimens are dredged in shallow water. 

 Two species occur in north Australia and the Pacific Ocean, but it is the 

 West Indian species that is here included. It is impossible to accept such 

 a record, and I do not think that the shell upon which Sater based his record 

 had any history at all. It was certainly never collected alive in New Zea- 

 land waters. The locality, Pitt Island, I do not understand, and in view 

 of the known distribution of Chitons this species cannot be recognized as 

 Neozelanic. Will collectors please note. 



Onithochiton neglectus (Rochebrune, 1881). [P. 49.] 

 In the Proc. Mai. Soc. (Lond.), vol. ix, p. 153, 1910, I wrote upon New 

 Zealand Onithochitons, and agreed with Thiele that 0. semisculptus Pilsbry 

 was an absolute synonym of 0. undulatus Quoy and Gaimard, and that. 

 • moreover. Pilsbry' s name was antedated by Rochebrune's four specific 

 names published a dozen years earlier. I also stated that I would consider 

 Suter's var. subantarcticus as a different species. In the same, journal, 

 vol. xi. pp. 45-46, 1914, I noted that Quoy and Gaimard's name was pre- 

 occupied, and that the common New Zealand shell would bear the name 

 0. jilholi Rochebrune. Upon reconfirming my data I find that this was clue 

 to a misreading of my notes, and that the name to be used is 0. neglectus 

 Rochebrune. 



Suter's record of his var. subantarcticus from Cook Strait and New Brighton 

 does not refer to this species, which is confined to the subantarctic islands, 

 but belongs to a species quite distinct, but as yet unnamed. 



Summaries are most helpful, and I here give a summary of my classi- 

 fication of the Neozelanic. Chiton fauna, with the use of Thiele's system as 

 basis. I add the original reference only when it differs or is not given by 

 Suter. 



Suborder Lepidopleurina. 



Fam. Lepidopleuridae Pilsbry. 



Genus Lepidopleurus Risso, 1826. 



Subgenus Terenochtton Iredale, 1914. Terenochiton Iredale, 

 Proc. Mai. Soc. (Lond.), vol. xi, p. 28, 1914. Type: 

 Lepidopleurus subtropicalis Iredale. 

 Lepidopleurus inquinatus (Reeve, 1847). 



