56 



DISTRIBUTION IN TIME AND SPACE. 



Number of Species. 



Chiton 



Patella 



FiSSURELLA. . . 



Emarginula. . 

 Capulits 



PiLEOPSIS 



Crepidula 



Calyptr^a. . . 



Sigaretus 



Natica 



Nerita 



Neritina 



avellana 



Nerin^a 



turbonilla . . 

 loxonema. . . . 

 Macrocheilus. 



scalaria 



Turritella . . 

 Phasianella.. 



Littorina 



Turbo 



Delphinula.. 

 euomphalus. . 



Solarium 



Rotella I 



Phorus j 



Trochxjs j 



murchisonia 



schizostoma 



Pleurotomaria . 



Cirrus 



Cerithium 



rostellaria 



Pteroceras 



Strombus 



MUREX 



Fusus 



Ptrula 



Pleurotoma. . .. 



Fasciolaria 



Cassis 



BUCCINUM 



Terebra 



VOLUTA 



Mitra.. 



Oliva 



Ctpr^a 



CONUS 



Total 



127 



10 



21 



30 



13 



128 



2 



1 



473 



56 



66 



15 17 33 367 701 



30 



22 1 



65 



31 



98 

 80 



34 



24 

 40 

 16 

 11 

 15 



230 

 52 

 34 

 13 

 92 

 32 

 23 

 17 



100 



296 

 29 

 31 



264 

 55 

 90 



102 

 15 

 17 



362 

 48 

 17 



310 

 14 



367 

 94 

 27 

 36 



187 



357 

 56 



350 

 34 

 36 



173 

 37 



106 



112 

 32 

 92 

 92 



90 



6 



10 



70 



210 



100 



40 



370 



15 



35 



100 



110 



70 



350 



120 



160 



270 



2783 4516 3500 8016 



