544 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. [1885. 



Acmaea paleacea Gld. 



Commou ou sea-grass outside the harbor at San Diego, and also found 

 at Todos Santos Bay. 

 Acmaea depicta Hds. 



On sea-grass; not rare. 



CHITONID21 



Chiton (Ijeptochiton) nexus Cpr. 



Sau Diego. 

 Chiton (Trachydermon) dentiens Gld. 



With Acmcea pelta, var. 



San Diego. [T. pseudodentiens Cpr. D.] 

 Chiton (Callochiton) finabriatus Cpr. 



San Diego, Cataliua Island. 

 Chiton (Chaetopleura) hartwegii Cpr. 



This with the two following are the more common species. 

 Chiton (Maugerella) conspicua Cpr. 



Abundant beneath bowlders on shingle beaches. 

 Chiton (Stenoradsia) magdalenensis Hds. 



Beneath bowlders at False Bay ; not rare. 

 Chiton (Pallochiton) lanuginosa (Cpr.) Dall, 1878. 



[HempMllia lanuginosa Cpr. MSS. The generic name was already 

 preoccupied in Limacidce. D.] 

 Chiton (Lepidopleurus ?) pectinulatus Cpr. 



San Diego. 

 Chiton (Callistochiton) decoratus Cpr. 



San Diego. 

 Chiton (Nuttallina) scabra Reeve. 



Sau Diego. 

 Chiton (Mopalia) ciliata H. & A. Ad. 

 Chiton (Mopalia) lignosa Gld. var. acuta Cpr. 



OPISTHOBRANCHIA. 



Philine, species indet. 



Flats on shores of San Diego Bay, with Raminea vesicula, 



Atys nonscripta A. Ad. 



Rare at San Diego. 

 Tornatella punctoceelata Cpr. 



Not commou. 

 Cylichna inculta Gld. 



Abuudant on the sandy shores of San Diego Bay. 



Tornatina eximia Baird. 



San Diego Bay. 



[Described from Vancouver. D.] 

 Bulla nebulosa Gld. 



Plentiful on muddy flats in spring. 



