DR. PHILIPPE S COMPARATIVE TABLES OF MOLLUSCA. 



107 



to both, and 18 instead of 14 per cent, of marine Gasteropoda 

 marks a similar approximation. But here also the general law 

 still holds, of the Bivalves being more widely distributed than the 

 Gasteropoda. 



If we glance at the physiognomy of the fauna as before, the 

 difference is found to be even greater than could be supposed from 

 the numbers. The following Sicilian genera, for instance, are 

 absent in the Red Sea : — 



Teredo 



Thracia 



Anomia 



Chenopus 



Pholas 



Mesodesma 



Crepidula 



Cassidaria 



Solenomya 



Astarte 



Coriocella 





Pandora 



Isocardia 



Siliquaria 





And, on the other hand, the following found in the Red Sea do 

 not appear in the Mediterranean ; namely — 



Aspergillum Crenatula Nerita (in its Ancillaria 



Sanguinolaria Perna limited sense) Harpa 



Anatina Vulsella Ampullaria Ricinula 



Cyrene Malleus Melania Terebra 



Tridacna Plicatula Melanopsis Turbinella 



Crassatella Pedum Pyramidella Strombus 



Aetheria Siphonaria Oliva Pterocera 



It is also universally the case, that the genera which in Sicily 

 are rich in number of species, in the Red Sea have very few and 

 the converse. 



In the Red Sea are — 



Chama 



5 



Cypraea 



16 



Pinna 



10 



Mitra 



10 



Ostrea 



11 



Terebra 



6 



Nerita 



4 



Cerithium 



17 



Conus 



19 



Strombus 



8 



In Sicily — 

 Chiton 

 Natica 

 Trochus 

 Pleurotoma 

 Buccinum 



8 

 10 

 27 

 18 

 28 



It will not now seem extraordinary that the species which in 

 Sicily are most common are absent in the Red Sea. As examples, 

 we have 



Solen siliqua 

 Tellina pulchella 

 donacina 

 planata 

 tenuis 

 depressa 

 Donax venusta 

 Cytherea chione 

 Venus gallina 



geographica 

 Cardium (all) 

 Cardita sulcata 

 Isocardia cor 

 Pectunculus pilosus 

 Modiola barbata 

 Myrtilus edulis 

 Lima inflata 



Pectens (all) 

 Anomia (all) 

 Pileopsis hungarica 

 Crepidula unguiformis 

 Bulla hydatis 

 Rissoa (almost all) 

 Natica millepunctata 



intricata 

 Scalaria communis 

 Trochus granulatus 

 cornulus 

 fragarioides 

 rugosus 

 fanulum 

 magus * 

 Monodonta Vieilloti 

 Jussieui 



Turbo neritoides L. 

 Murex brandaris. 

 erinaceus 

 tarentinus 

 cristatus 

 Edwardsii 

 Buccinum d'Orbignyi 

 corniculuin 

 neriteum 

 pusio L. 

 scriptum L. 

 Columbella rustica 

 Cypraea lurida 

 pyrum 

 coccinella, &c. 



* The shell that has been thought to be this is the very different Troclins 

 erythrceus Broc. 



