342 JOURNAI. OF CONCHOLOGY, VOL. 14, NO. ll, |UI,V, I915. 



Thus the British forms would be classed thus : 



Family LEPIDOPLEURID.4^. 



Genus Lepidopleurus Risso. 



Hanleya Gray. 

 Family LEPIDOCHFrONID^:. 



Genus Tonicella Carpenter. 



Callochiton Gray. 



Lepidochiton Gray (em). 



{-=CRASPED0CH1LUS Sars). 

 Family CRYPTOCONCHII)/E. 

 Genus Acanthochiton Gray (em). 



The reasons for these alterations I have given in the Proc. Malac. 

 Soc. Lond., vol. xi., pp. 126-129, 19 14. 



Genus Modiolaria Beck. 



I propose to displace this by Musculus Bolten, Mus. Bolten, 1798, 



p. 156, designating as type of that genus Musculus discors Bolten 



-^^Mytilus discors Linne. Details concerning this will be elsewhere 



given. ^ 



Genus Pecten Miiller. 



I would generically separate from Pecten Miiller, Hinniies Defrance 

 and Ch/a/ins Bolten. Under this latter genus, Hyalopectoi Verrill, 

 Aequipecten Fischer, Pepliim B. D. & D. and Palliolum Monterosato 

 might be given subgeneric rank. 



Genus Arctica Schumacher. 

 Mr. E. A. Smith has argued (Proc. Malac. Soc, I>ond., vol. x., 

 p. 105, 191 2) for tlie rejection of this name in favour of Cyprina. 

 My reading of the nomenclatural rules would compel me to re- 

 tain Arctica. This is one of the debatable points upon which 

 discussion is necessary, though I consider the rules are so simple 

 that there is little danger of misreading them. 



Genus Loripes Poli. 

 Again this is a debatable point, but I cannot accept any of 

 Poll's generic names. In the present case this name was proposed 

 for the animal of l^eilina lactea Linne, and I note that he named 

 the shell Loripoderma. Such a double nomination seems to me 

 mutually to render each invalid. Lucinida D'Orbigny is the name 

 I at present accept. 



I I communic.-ited my results to Dr. W. H. Dall by letter, and be lias confirmed my 

 selection in the Nautiiiis, vol. x.wiii. t.\pr. 1915), p. 13S. 



