Ihrdale. — Marine Mollusca of Banks Peninsula. 399 



Order FILIBRANCHIA. 

 Fam. ARCiDiE. 

 Philobrya costata, Bernard. 



Commonly occurring in seaweed - washings ; in clusters under 

 dirty stones between tide-marks. 



Philobrya filholi, Bernard. 



One specimen in seaweed-washings. 



Philobrya meleagrina, Bernard. 

 Valves in shell-sand. 



Hochstetteria trapezina, Bernard. 



Not uncommon in seaweed-washings. 



Fam. Mytilidje. 

 Mytilus edulis, Linne. 



canaliculus, Martyn. 

 magellanicus, Chemnitz. 

 All common between tide-marks ; the last named scarce. 



Modiolus australis. Gray. 



Have only met with one live specimen, washed up after a 

 storm. 



Modiolus ater, Frauenfeld. 



Abundant between tide-marks. 



Modiolaria impacta, Hermannsen. 



Not uncommon ; in crevices of rocks, and commensal with 

 Ascidians. 



Lithophaga truncata, Gray. 



Have only met with dead shells. 



Fam. Pectinice. 

 Pecten medius, Lamarck. 



Dead shells on beaches only as yet. 



Chlamys radiatus, Hutton. 



One valve found on a sandy beach. 



Chlamys zelandice, Gray. 

 gemmulatus, Reeve. 

 Valves on beaches ; young live specimens attached by a 

 byssus to stones in rock-pools. 



Order EULAMELLTBRANCHIA. 



Fam. OstreiDuE. 

 Ostrcea angasi, Sowerby. 



Live shells sometimes met with cast up after storms. 



