Iredale.— Marine Mollusca of Banks Peninsula. 389 



have differentiated between the suborders Tectibranchia and 

 Nudibranchia — for the reason that of the latter I have collected 

 at least twenty distinct species, but, as they have not yet been 

 thoroughly studied, I have only included ten identifications 

 already on record, and noted the remaining as " ten other 

 distinct species." 



As regards specific nomenclature, I have followed the " Index 

 Faunae Novae-Zealandiae," such corrections by Hedley and Suter 

 as have come under my notice having been included. 



As author of this paper, I have used throughout the singular 

 pronoun. I wish here to acknowledge, however, in justice to 

 my friend Mr. W. R. Brook Oliver, that many of the rarest 

 finds have been made by him. As he usually accompanied 

 me on my collecting trips, it was mere chance to whose lot 

 happened the find. 



Class AMPHINEURA. 



Order POLYPLACOPHORA. 



Fam. Lepidopleurice. 



Lepidopleurus inquinatus, Reeve. 



Rarely met with in the littoral zone ; dredged in numbers 

 in shallow water on Turritella rosea, Q. and G. 



Fam. Ischnochitonid^e. 



Ischnochiton longicymba, Q. and G. 



Abundant under stones between tide-marks. 



Ischnochiton fulvus, Suter. 



Dredged with L. inquinatus, Reeve. 



Fam. Mopaliid^. 

 Plaxiphora biramosa, Q. and G. 



Not uncommon on kelp-covered rocks at low-water mark. 



Plaxiphora coelata, Reeve. 



Common on rocks between tide-marks, also in roots of kelp. 



Plaxiphora suteri, Pilsbry. 



With P. biramosa, Q. and G., but much more plentiful. 

 Plaxiphora ovata, Hutton. 



Have only met with this Chiton in the roots of Durvillt 

 utilis, where it is not uncommon. 



Fam. Acanthochitice. 



Acanthochites porosus, Burrow. 



Not uncommon on rocks about low- water mark. 



Acanthochites zelandicus, Q. and G. 



Common anywhere between tide-marks, under stones. 



