PLATE LXVIII. 



AGE 



Platyceinus veeeucosus White 705 



Fig. la. The type specimen, (ilus. Comp. Zool.) 



lb. Oblique view of the dorsal cup. (Coll. W. and Sp.) 

 Ir. Another specimen ; dorsal aspect of the calyx. (Same collection.) 

 Id. Lateral aspect of a variety from New Mexico, showiug the anal oiDening. 

 (Same collection.) 



Plattceiuus pocillifoemis Hall 706 



2a. Lateral aspect of the dorsal cup (the ornamentation from another specimen). 



(Coll. W. and Sp.) 

 2b. Base of a specimen with larger nodes. (Coll. W. and Sp.) 



Plattceinus Yandelli 0. and Sh 700 



3a. Dorsal aspect of the calyx; a very mature specimen. (Same collection.) 

 35. Ventral aspect of the same specimen. 

 3c. Posterior view of same. 



Platyoeinus Yandelli, var. peeaspee 708 



4a. Lateral view of a specimen with arms. (Mus. Comp. Zool.) 

 4b. Dorsal aspect of the same specimen (the stem removed). 



Platyoeinus sculptus Hall 691 



5. Specimen from New Mexico, lateral view of the calyx. (Coll. W. and Sp.) 



Plattceinus paevinodus Hall 090 



6«. Side view of the type, the specimen somewhat flattened. (Mus. Comp. 



Zool.) 

 6b. Anterior view of another specimen less distorted. (Coll. W. and Sp.) 



Plattceinus peculiaris W. and Sp 700 



7a. Posterior view of the calyx; the nodes partly eroded by weathering. (Colh 



W. and Sp.) 

 7b. Ventral aspect of the same specimen. 



Platyceixus geometeicus W. and Sp 697 



8. Another type specimen. (Coll. W. and Sp.) 



