170 



Correspondence. 



the curious fact, that whilst both the land and marine shells are 

 chiefly of European species, the littoral portion of the latter are 

 mostly of African type, common to West Africa, as well as to the 

 Canary and Madeira Islands. He has not given any interpreta- 

 tion of this significant record of changes which the earth must have 

 undergone since the introduction of the existing fauna, and which 

 may possibly be deserving of the attention of geologists. 



The preceding facts are all that are referred to in the notes be- 

 fore me, and I only hope that I have succeeded in stating them 

 intelligibly. 



Robt. M 'Andrew. 



Liverpool, 19«A Dec. 1854. 



List of Shells obtained from the Azores. 



Marine 

 Chiton fascicularis — (Celtic and Lu- 



sitanian.) 

 Patella vulgata — (Celtic and Lusita- 



nian.) 

 Acmsea Gussoni — (Mediterranean and 

 Canaries.) 

 „ parva — (Celtic.) 

 Emarginula (pink) — (Madeira.) 

 Fissurella — (Mediterranean.) 

 Haliotis (tuberculatus, var. ?) — (Lusi- 

 tanian.,) 

 Trochus Langieri — (Portugal and Me- 

 diterranean.) 

 „ striatus, var . — (Portugal and Me- 

 diterranean.) 

 „ (monodonta) Berthelotti — Cana- 

 ries and Madeira.) 

 Turbo rugosus — (Lusitanian.) 

 Phasianella pullus ? — (Lusitanian.) 

 Fossarus Adamsoni (littoral) — (Africa 



and Canaries.) 

 Littorina striata (littoral) — (Africa 



and Canaries.) 

 Rissoa cingillus— (Celtic.) 



„ crenatus — (Mediterranean and 



Canaries.) 

 „ clathrus — (Celtic and Lusita- 

 nian.) 

 „ cimex — (Lusitanian.) 

 „ new species ? 

 „ new species ? 

 Cerithium adversum — (Celtic and Lu- 

 sitanian.) 

 „ reticulatum — (Celtic and Lusi- 

 tanian.) 

 Scalaria clathratula — (Celtic and Lu- 

 sitanian.) 

 Eulima Boscii ? — (Canaries and Ma- 

 deira.) 

 „ distorta — (Canaries, Celtic, and 

 Lusitanian.) 



Mollusca. 



Natica intricata ? — (Lusitanian and 

 Canaries.) 



Chemnitzia elegantissima (Celtic 



and Lusitanian.) 



Mitra fusca (littoral) — (Africa, Cana- 

 ries, &c.) 

 , y zebrina (littoral) — (Africa, Ca- 

 naries, &c.) 



Mangelia septangularis ? — (Celtic.) 

 " (or Columbella) (Peculiar.) 



Nassu incrassata — (Celtic and Lusita- 

 nian.) 



Columbella rustica — (Lusitanian.) 

 „ cribraria ? ? — (Canaries.) 



Murex corallinus — (Lusitanian.) 



Purpura haemastoma — (Lusitanian and 

 Canaries.) 



Triton nodosum (dwarf var.) — (Lusi- 

 tanian and Canaries.) 

 „ tuberosum — (Canaries.) 

 , t scrobiculatum (Mediterra- 

 nean.) 



Cypraea pulex — (Mediterranean.) 



Pedipes (littoral) — Africa and Cana- 

 ries.) 



Conovulus albus — (Celtic.) 



Ianthina fragilis j flQ 

 „ exigua J 



Spirula Peronii — (Portugal, Canaries, 

 &c.) 



Tapes 



Cardiumpapyraceum— (Mediterranean 

 and Canaries.) 



Cardita calyculata — (Mediterranean 

 and Canaries.) 



Ervilia castanea — (Portugal, Canaries, 

 and Mediterranean.) 



Cytheria Chione — (Lusitanian.) 



Pecten pusio— (Celtic and Lusitanian.) 



Lima hians— (Celtic and Lusitanian.) 



