Lingula rectilateralis Emmons 



Page 91 

 Fig. i Specimen figured in natural size. 



Schenectady beds. Dettbarn quarry, Schenectady, N. Y. 



Orbiculoidea tenuistriata Ulrich 



Page 91 

 Fig. 2 Pedicle valve, x 4. 



Top of Frankfort shale, Frankfort gulf, N. Y. 



Plectambonites sericeus (typus) Sowerby 

 Page 91 



Fig". 3> 4 Two pedicle valves, showing the mesial fold. Figure 7x2; 



Figure 8 x 3. 



Fig. 5 Brachial valve, x 2. From squeeze. 

 Fig. 6 Interior of brachial valve, x 2. From squeeze. 



Snake Hill beds. Snake hill, Saratoga county, N. Y. 



Plectambonites centricarinatus nov. 

 Page 92 



Fig. 7 Holotype. Pedicle valve, x 4. 



Indian Ladder beds. Indian Ladder, Albany county, N. Y. 



Plectorthis sp. cf. whitfieldi (N. H. Winchell) 

 Page 92 



Fig. 8 Brachial valve. Natural size. From squeeze. 



Snake Hill beds. Snake hill, Saratoga county, N. Y. 



Plaesiomys retrorsa (Salter) 

 Page 93 



Fig. 9 Brachial valve. Natural size. From" squeeze. 



Fig. 10 Cardinal portion of brachial valve, x 2. From squeeze. 



Fig. II Pedicle valve. Natural size. 



Fig. 12 Enlargement (x 5) of surface. 



Snake Hill beds. Snake hill, Saratoga county, N. Y. 



Plaesiomys cf. porcata McCoy 

 Page 93 



Fig. 13 Pedicle valve. Natural size. From squeeze. 



.Snake Hill beds. Snake hill, Saratoga county, N. Y. 



Clitambonites americanus (Whitfield) 

 Page 94 



Fig. 14, 15 Two views of brachial valves. Natural size. 

 Fig. 16-19 Views of the pedicle valve. Natural size. 



Snake Hill beds. Snake hill, Saratoga county, N. Y. 

 All originals are in the New York State Museum. 



132 



