CONTENTS. 



Page 



Clypeastrina Gregory 9 



General Characteristics 9 



The Spines, Pedicellariae, Sphaeridia, 



and Spicules 13 



The Families of Clypeastrina . . 17 



Key to the Families of Clypeastrina . 18 



Clypeastridae Agassiz .... 19 



Key to the Genera of Clypeastridae 19 



Anomolanthus Bell .... 20 



Clypeaster Lamarck .... 20 



Key to the Species of Clypeaster . 22 



Clypeaster rosaceus (L.), 



Plate 123, fig. 1 ... 25 

 fClypeaster pallidus H. L. 

 Clark, Plates 122, figs. 

 16-18; 123, figs. 2-4; 

 139, figs. 1-3 ... . 25 

 Clypeaster ravenelii (A. 

 Ag.), Plates 122, figs. 12- 

 14; 123, figs. 5-10 . . 27 

 fClypeaster europacificus H 

 L. Clark, Plates 123, figs 

 13-16; 129; ISO; 131; 136 



fig. 1 27 



Clypeaster audouini Four- 

 tau, Plates 122, fig. 10 



123, fig. 24 29 



Clypeaster rarispinus de 



Meij 30 



fClypeaster ochrus H. L. 



Clark, Plate 141, figs. 1-3 30 

 Clypeaster speciosus Verr.. 

 Plates 122, fig. 11; 128, 

 fig. 7; 135, figs. 1,2; 136, 



fig. 5 31 



Clypeaster australasiae 

 (Gray), Plates 128, fig. 4; 

 134, figs. 1-3; 135, fig. 6 . 32 



Clypeaster japonicus Dod. 

 Plates 128, fig. 5; 136 

 figs. 2-4; 138, fig. 5 . 



*Clypeaster lytopetalus A 

 Ag. & CI., Plates 124 

 figs. 1, 2; 138, figs. 1-3 



*Clypeaster reticulatus (L). 

 Plate 124, figs. 3-6 . 



Clypeaster humilis (Leske) 

 Plates 123, fig. 23; 137 



138, fig. 4 ... 

 Clypeaster prostratus Ra- 



venel 



Clypeaster rotundus (A 

 Ag.), Plates 122, figs. 5- 

 7; 123, figs. 25-27; 128 

 fig. 67 132; 133 . . . 



Clypeaster subdepressus 

 (Gray), Plate 123, figs. 11, 

 12 



Clypeaster virescens, Dod., 

 Plates 122, fig. 15; 123, 

 figs. 28-31; 128, fig. 8; 



139, fig. 4; 140, figs. 1,2 . 

 *Clypeaster leptostracon A. 



Ag. & CI., Pates 122, 



figs. 8, 9; 123, figs. 17- 



20; 135, figs. 5-5 . . . 



Clypeaster lamprus H. L. 



Clark, Plates 122, figs. 1- 



4; 123, figs. 21, 22 



Arachnoididae Gregory . . 



Arachnoides Leske 



Arachnoides placenta 



Plate 125, figs. 1-3 . 



Laganidae A. Ag 



Key to the Genera of Laganidae 



(L.) 



Laganum Grav 



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33 



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37 



38 



38 



39 



40 



42 

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43 



43 

 44 

 44 



Hawaiian species. 



t Nmv species. 



