DR. PHILIPP1 S COMPARATIVE TABLES OF MOLLUSC A. 



103 



Conchiferous Marine Gasteropoda. 



Chiton fascicularis L. 

 Patella casrulea L. 

 E margin ula elongata Costa 

 Chemnitzia elegantissima Mont. 

 Eulima distorta Desk. 

 Ianthina bicolor Menke. 

 nitens Menke. 

 Haliotis tuberculata L. 

 Scalaria pseudo-scalaria Broc. 

 Trochus fragarioides Lam. 



Richardi Payr. 



Magus L. 



rugosus L. (Tui'bo) 

 Phasianella pulla L. 

 Turritella triplicata Broc. 

 Cerithium vulgatum Brg. 

 Lima Brg. 



Cerithium perversum Lam. 

 Murex brandaris L. 

 trunculus L. 

 Tritonium nodiferum L. 



scrobiculator L. 



cutaceum L. 

 Cassis undulata L. 

 Dolium galea L. 

 Purpura hsemastoma L. 

 Buccinum mutabile L. 



reticulatum L. 

 Columbella rustica L. 

 Mitra Ebenus Lam. 

 Ringicula auriculata Men. 

 Cypra^a lurida L. 

 pyrum L. 

 spurca L. 



Land and Fresh-water Mollusca. 



Testacella haliotidea F. B. 

 Helix pisana Mull. 



cellaria Mull. 



maritima Drap. 



lenticula Fer. 



Octopus vulgaris Lam^ 

 ruber Rap. 



Bulimus ventricosus Drap. 



pupa L. 



decollatus L. 

 Cyclostoma elegans Mull. 

 Physa fontinalis L 



Cephalopoda. 



Loligo vulgaris Lam. 

 Sepia officinalis L. 



The following table shows the number of species of Mollusca 

 in the different groups of the fauna of the Canary Islands, and the 

 number and proportion of species found also in Sicily : — 





Absolute No. of 



Spec, common 

 to the two 



Proportion of species common 





Species. 



localities. 



to both. 



Canaries 



Sicily. 







Marine Bivalves 



34 



188 



23 



68 per ct. Canaries 13 Sicil. 



Brachiopoda 



1 



10 



1 





Pteropoda 



16 



13 



5 



34 „ 38 „ 



Naked marine Gas- "1 











teropoda J 



5 



54 









Conchiferous do. do. 



78 



313 



34 



461 „ u u 



Land and fresh- "1 











water do. J 



59 



186 



10 



17 „ 5 „ 



Cephalopoda 



8 



15 



4 



26 „ 



Among the groups of Mollusca represented by the largest number 

 of species, the bivalves again exhibit more species in common than 

 the marine Gasteropoda. The resemblance between the land and 

 fresh-water Gasteropoda of the two districts is very slight, most of 

 the Canary Island species being confined to that locality, obeying 

 the same law according to which the plants of islands far removed 

 from any continent are generally peculiar and elsewhere unknown. 

 Since the number of land mollusca in the Canary Islands is so 



H 4 



