PLATE LXVI. 



Page 

 Plattckinus hemispheeicus M. and W 703 



Fig. la. Specimen showing anus and stem. 



U. Dorsal aspect of another specimen with arms spreading, and a Platyceras 



infundlbulum covering anal opening. 

 Ic. Lateral view of the calyx ; also a Platyceras infundibulum attached. 

 Id. Ventral aspect of another specimen. 



Platyceinus subspinulosus Hall 684 



2a. Lateral view of the dorsal cup ; a very large specimen. 

 2b. Base of the same specimen. 



Platyceinus veeeucosus White 705 



3a. Lateral view of the dorsal cup. 

 3b. Dorsal aspect of the same. 



Platyceinus excavatus Hall 718 



4. A specimen with arms. (The figure does not show sufficiently the abrupt 

 depressions on the radials just below their facets.) 



Platyceinus nodo-steiatus W. and Sp 698 



5a. Dorsal aspect. 



5b. Side view of a somewhat depressed specimen. 



Platyceinus Yandelli 0. and Sh 706 



G(t. Dorsal aspect of a specimen with arms. 



6b. Posterior view of calyx. 



6c. Ventral aspect of the same specimen. 



Platyceinus spinifee W. and Sp 708 



7. The type specimen with arms. 



Platyceinus oenigeanulus McChesney 701 



8. A specimen with arms. 



Platyceinus subspinosus Hall 717 



9a. Dorsal aspect of a perfect specimen with arms. (Mus. Comp. Zool.) 

 9?*. Ventral aspect of the calyx. 



Platyceinus discoideus 0. and Sh 713 



lOrt. Dorsal aspect of a specimen with arms, the outer parts of the latter slightly 



restored in two rays. 

 lOJ. Ventral aspect of the calyx. 

 10c. Posterior side of the same specimen. 



(All specimens, except Fig. 9a, in the collection of Wachsmuth and Springer.) 



