118 



HIE NAUTILUS. 



Corneous. 



Corneo-testaceous. 



Not seen. 



Testaceous to Corneo-testaceous. 

 In C. majuseulum Morelet the 

 corneous layer is quite intimately 

 and equally developed with the 

 testaceous. 



Corneous. 



Testaceous. 



Testaceous. 



Corneous layer quite thick in in- 

 stances as C. bicarinatum Swb., 

 C. filosum Swb., C. Madagascar - 

 tense Gray, 0. rangelinum, C. 

 xanthocheilus. 



Testaceous to Testaceo-corneous. 



Testaceous. 



Testaceous. 



Corneo-cartilaginous. 



Not seen. 



Not seen. 



Not seen. 



Not seen. 



Testaceous to Sub testaceous. 



Testaceous. 



Testaceous to Sub-testaceous. 



Testaceous. 



Registoma. 



Gallia. 



Jamaicia. 



Licina. 

 Choanoponia. 



Adamsiella. 



Lithidion. 



Otopoma. 



Cycloslomus. 



Tudora. 



Leonia. 



Cist ula. 



Chondropoma. 



Pomatias. 



Realia. 



Omphalotropis. 



Bourciera. 



Hybocystis. 



Cyclolopisis. 



Ctenopoma. 



Diplopotna. 



Corneous. 

 Membranous. 

 Corneous. 

 1 



Corneous. 



Sub-cartilaginous. 

 Corneous. 

 Corneous. 

 Corneous. 



Corneous. 



Testaceous. 



Cartilaginous. 



Sub-cartilaginous. 



Cartilaginous. 



Corneous. 



Corneous. 



Corneous. 



Collections of the Cyclostomacea are often sadly deficient in oper- 

 cula, and this very interesting feature is- as frequently absent as 

 present. It seems most probable that opercula have no exact generic 

 value, and should not be regarded with the extreme importance as- 

 signed to them by Pfeiffer, H. & A. Adams, and other authors. 



It is hoped that a more detailed and illustrated study of them will 

 be made in the future. 



NOTES. 



Tin: Winklet Collection of Shells "A most gratifying 



gift was received last June from the Rev. Henry W. Winkley, of 

 Branford, Conn.; it consists of a large series, some 1600 species and 



