

17 



/A 



15 



18 



19 



Figs. 14-20. — 14, 15, Clypeus sinuatiis Leske: 14, Apical system of USNM 131253, from the 

 Middle Jurassic (Bathonian), Great Oolite, at Kirtlington, Oxford, England, X8; 15, phyllode 

 of ambulacrurn I of specimen No. 1037 in the Museum of Comparative Zoology, Harvard, from 

 the Great Oolite, Boulogne sur Mer, France, X 4- 16, 17, Clypeus wylliei var. pentagona Currie : 

 16, Phyllode of ambulacrum I of Currie's (1925, pi. 10, fig. 2) figured specimen in the Hunterian 

 Museum, Glasgow, from the Jurassic, Bihendula, British Somaliland, X 10; 17, apical system 

 of same specimen, X 10. 18-20, Bothryopneiistcs lamberti Fourtau: 18, Adoral view of para- 

 type, USNM 131262, from Upper Jurassic (Callovian), at Gebel Oum Chabba, Egypt, X3; 

 19, apical system, partially preserved, X I5; 20, phyllode of ambulacrum II of same specimen. 



36 



