616 Contributions to Invertebrate Palaeontology. 



PAL^opALiEMON Newbekryi Whitf. Page 571. 



Fig. 19. Lateral view of the specimen enlarged to two diameters, showing the 



parts described. 

 Fig. 20, Posterior view of the last abdominal segment and telson as seen on 



the specimen, in impression of the under surface. 

 Fig. 21. View of the upper surface of the same as obtained from the matrix 



by gutta-percha, both enlarged as Fig. 19. The figures indicate 



the difi'erent elements of the caudal Jlap. 



PLATE XIII. 



Zaphrentis Cliffordana Ed. and Haime. Page 576. 



Fig. 1. View of an imperfect specimen showing the interior of the cup. 

 Fig. 2. Lateral view of another and smaller specimen. 



Fig. 3. Enlarged transverse section of a specimen just below the bottom of 

 the cup. 



Pentremites elegans Lyon. Page 577. 

 Fig. 4. Lateral view of a specimen from Newtonville, Ohio. 



Cyathocrinus Maxvillensis Whitf. Page 577. 



Fig. 5. View of the anal side of a small specimen showing the long second 



radial plates and anal series, enlarged to two diameters. 

 Figs. 6 and 7. Anterior and posterior sides of another individual showing the 



thickened outer arm of the antero-lateral ray and the small second 



radials of the anterior ray, natural size. 

 Fig. 8. Anterior view of a third specimen, natural size, showing the thickened 



lateral anus. 



Synocladia rectistyla Whitf. Page 579. 



Fig. 9. View of the inside of a frond, natural size, showing the straight rigid 



rays. 

 Fig. 10. Enlargement of a portion of the celluliferous surface showing the 



arrangements of the cells. 



Streptorhynchus crassum M. and W. Page 580. 

 Figs. 11 and 12. Impression of a vfi wral valve and a dorsal valve, retaining 

 the shell, the former, 'ing the flattening of the umbonal area. 



Productus pileiformis McChesney. Page 582. 

 Figs. 13 and 14. Front and profile views of a specimen referred to this species. 



Productus elegans N. and P. Page 581. 

 Figs. 15 and 16. Two views of a specimen of this species of characteristic form. 



