PLATE XIII. 



PAGE. 



Fig. 1. Platyceras (Orthonychia) LoDiENisis 313 



la. A lateral view. 

 1&. View from above. 



Figs. 2 and 3. Melocrinus (Ctenocrinus) Bainbridgensis 158 



9. Lateral view of the specimen, looking upon the right antero-lateral ray. 

 2a. Basal view of the specimen, the anal ana being on the lower side. From the Huron shale 

 (Devonian). 



Fig. 4. pLATYCRiNtJs Bedfordeksis 161 



Yiew of a portion of the block upon the surface of which the specimens are imbedded and 

 partly covered by a pyritiferous shale. 



AlLORISMA (SeDGWIGKIA ?) PLEUROPISTHA 309 



4a. A left view of a specimen somewhat distorted by oblique pr-^ssure. 



4&. Another specimen, apparently of this spp cies, with the posterior end broken away, and the 



costEB ranging much more obliquely than in the last, the difference being probabJy due 



to oblique pressure in ane or both. 

 4c. Anterior vjbW of same, the inequivalve appearance probably accidental. 



Fig. 5. Grammysia ventricosa 303 



5a. Left view of a specimen, probably, to some extent, a little more than naturally depressed. 

 5b. An anterior view of same. 



Fig. 6. EoMONDtA? TAPESIF0RMI8 , 304 



Eight aide view. 



Fig. 7. Pleurotomaria textiligera 314 



^a. View ot a specimen that is mainly an internal cast, but shows indistinctly remaius of sur- 

 face markings. 



7&. A gutta-percha cast of the upper part of the spire taken in a natural mould, showing the 

 sharply defined marks of growth. 



