374 BATHYMETRICAL AND GEOGRAPHICAL DISTRIBUTION. 



We have in Temnechinus maculatus and Trigonocidaris albida representa- 

 tives of the Teinnopleuridae, thus far limited almost entirely to the Indian 

 and China Seas. The littoral species having the most limited bathymetrical 

 range are those which have the widest geographical distribution. They are 

 Diadema setosum, Cidaris tribuloides, Clypeaster subdepressus, Echinometra 

 subangularis, Toxopneustes variegatus, Mellita testudinata, Encope emargi- 

 nata. Some of these species extend from the southern part of Brazil to the 

 Bermudas. They all belong to genera having representatives in the great 

 tropical belt surrounding the globe, formed by the Indo-Pacific, Lusitanian, 

 West African, Tropical Atlantic, and Panamic districts, — such as Cidaris, 

 Diadema, Echinometra, Hipponoe, Clypeaster, Echinanthus, Echinolampas, 

 Echinoncus, Brissus, — the species of which have a great geographical range, 

 and are represented by the following species : Cidaris metularia, Hipponoe 

 variegata, Echinometra lucunter, Diadema setosum, Clypeaster humilis, Echi- 

 nolampas oviformis, Echinoneus cyclostomus, Brissus carinatus ; all of which 

 have an immense geographical distribution. 



The precise range of the different species of the East Coast will be found 

 in Part I., in the Synonymy and in the General Lists of the Geographical 

 Distribution. 



