NORTH AMERICAN CONCIIOLOGY. 



235 



Jlliddendorfl^ — Beitriigc zu Eiuer Malacozoologia Rossica : 

 von Dr. A. Tii. von Middendorff. St. Petersburg, 1847-9. 

 (From Memoires des Sciences Naturelles de I'Academie Impe- 

 riale des Sciences. Tome YI.) 



[Very many New England and Arctic MoUusks are described in this 

 work ; I give only those referred to N. W. America. I quote from the 

 separate work. — W. G. B.] 



Part ii. iii. 

 32 

 34 i 



35 

 36 



Patella (Acmeea) cassis Esch. 

 scurra L(ss. 



Acmxa mitra Esch. 



mammillata Esch. 

 marmorea Esch. 

 LoUin ? pallida Gr. 

 digitalis Esch. 

 persona Esch. 



Acmwa radiata Esch. 

 ancylus Esch. 

 scutum Esch. 

 ? Lottia punctata Gray. 



16 



Sitka. 

 Sitka. 



Sitka. 

 Sitka. 



