160 



ROBERT TRACY JACKSON OX ECHINI. 



Table of Typical Ocular Plate Arrangement and Variation in the Centrechinoida (continued). 



B 



Suborder CAM A RODONTA (continued). 



o 



> 



> 



> 



O 



.s 

 > 



i 



605 



10 

 200 



129 

 299 

 10 

 127 

 100 



200 



16 



14 



Echinidae. 



Echinus affinis Mortensen. 



Off east coast of United States. 1,022-1,106 fathoms. 

 (Text-figs. 115, 176.) 



Echinus elegans Diiben and Koien. 

 Off Cape Remain and loc. (?) 



Echinus gracilis A. Agassiz. 



Off Carolina and Martha's Vineyard. 



Echinus esculentus Linne. 



Plymouth, England; Isle of Man; Mediterranean. 

 (Text-figs. 116, 117, 176.) 



Echinus miliaris Milller. 

 Norway; England; Isle of Man. 



Echinus microluberculalus Blainville. 

 Mediterranean. 



Echinus melo Lamarck. 

 Mediterranean; England. 



Echinus acutus Lamarck. 



Plymouth, England; Norway; Bergen; Mediterranean. 



Echinus angulosus Leske. 



Algoa Bay; Cape Colony; South Africa. (Text-fig. 

 176.) 



Echinus magellanicus Philippi. 



Patagonia; Straits of Magellan. Developing series, 



2.5-5 mm. diam. (36 specimens). (Plate 3, fig. 14.) 

 The same. 

 Falkland Islands; Straits of Magellan. Developed 



series (164 specimens). (Text-figs. 165, 176.) 



Echinus margaritaceus Lamarck. 

 Patagonia; Kerguelen Islands; Antarctic. 



Gymnechinus robillardi (Loriol). 

 Mauritius. (Text-fig. 179.) 



Gymnechinus pulcheUus Mortensen. 



Singapore; Gulf of Siam. (Text-figs. 177, 178.) 



100 * 

 605* 



1_(J0 

 8 



100 

 10 



97 

 195 



9S 

 126 



96 



287 



90 

 9 



83 

 104 



54 

 54 



97 

 35 



5 

 9 



6 

 1 



2 

 5 



W 

 1 



IS 

 23 



SO 

 30 



145 



6 

 1 



n 

 1 



3 



2 



0.3 

 1 



4 



7 



56 



OM 

 1 



e_ 

 1 



1 



2 



6 

 1 



S9 

 8 



100 

 14 



* Italic numerals represent percentages, Arabic numerals the number of specimens observed. 



