11 



DIVISION I. Having a scaly margin. 



Scientific name. 



Squamosus, 



Bistriatus, 



Fasciatus, 



Viridis, 



Tessellatus, 



Locality. 

 American Isles. 



(C M 



South America. 

 u «< 



St. Thomas. 



Scientific name. 



Sulcatus, 



Maculatus, 



Marmoratus, 



Indus, 



Locality. 



South Sea Isles. 

 East Indies. 

 Florida. 

 West Indies. 



DIVISION II. Having a coriaceous margin. 



The Chiton porosus and C. larvseformis of this division deserve particular 

 notice, as in some respects their characters differ from those of the other 

 species. The valves of the C. porosus are perforated by a small slit, and 

 the ligament of the C. larvseformis (which in other respects in the species 

 merely surrounds the margin) almost envelopes the whole shell, and gives it 

 the appearance of a caterpillar. 



Scientific name. 



Fulvus, 



Tunicatus, 



Castaneus, 



Lineatus, 



Aculeatus, 



Fascicularis, 



Punctatus, 



Ruber, 



Abbas, 



Cinereus, 



Bicolor, 



Cerasinus, 



Magellanicus, 



Fuscus, 



Granulatus, 



Locality. 



South America. 

 u u 



Cape of Good Hope. 



it a 



Nicobar Isles. 



England & Barbary. 



Europe, Asia, Amer. 



Norway. 



England. 



Goree. 



India. 



Surinam. 



Magellan Straits. 



Pulo Ponang. 



West Indies. 



Scientific name. 



Piceus, 



Minimus, 



Cimex, 



Asellus, 



Gigas, 



Islandicus, 



Marginatus, 



Laevis, 



Amiculatus, 



Tuberculatus, 



Crinitus, 



Thalassinus, 



Hispidus, 



Porosus, 



Larvae formis, 



Locality. 

 Idria and Red Sea. 

 Norway. 



African Coast. 

 Iceland. 

 French Coast. 

 England. 

 Kuiule Island. 

 West Indies. 

 Aberdeen. 



a 



West Indies. 



DIVISION III. Having a spinous margin. 



The C. spinosus is at present a very rare shell; its habitat is supposed to 

 be the Marquesas. 



