CONTENTS. 



Eehinodiscus tenuissimus 



(Agass. & Des.), Plate 



125, figs. 11, 12 . . 



Eehinodiscus bisperforatus 



Leske 



Echinodiscus bisperforatus 



var truncatus Agass. . 



Astriclypeus Verrill . . . 



Astriclypeus manni Verr. 



Plate 125, figs. 18-15 . 



Encope Agassiz .... 



Key to the Species of Encope . . 



Encope emarginata (Leske) 



Plate 125, fig. 25 . . 

 Encope micropora Agass. 

 Encope perspectiva Agass. 

 Encope michelini Agass 

 Encope californica Verr. 



Page 



71 



71 



72 

 72 



72 

 72 

 73 



74 

 74 

 74 

 75 

 75 



Page 



Encope grandis Agass., 

 Plate 125, 6g. U . . . 75 

 Mellita Agassiz 70 



Key to the Species of Mellita . . 70 

 Mellita quinquiesperforata 

 (Leske,, Plate 125, figs. 



16-21 76 



Mellita longifissa Mich. . 77 

 Mellita sexiesperforata 

 (Leske), Plate 125, figs. 



22, 23 77 



Mellita pacifica Verr. . . 77 



Rotula Agassiz 78 



Key to the Species of Rotula ... 78 

 Rotula orbiculus (L.) . . . 78 

 Rotula deciesdigitata 



(Leske) 78 



Explanation of Plates 



