852 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 45. 



Leiopteria rubra Williams. 



Fig. 4. — A small left valve. 



Formation and locality: Hersey red shale member of Pembroke formation, at head 

 of Sipps Bay, 100 yards south of highway bridge (loc. No. 2.32. 6A). 

 Cat. No. 58971. 



Eurymyella shaleri var. minor Wilhams. 



Fig. 5. — ^A small specimen, magnified 3 diameters, showing the form of the type 

 species, but of the small size, as it occurs in the Eastport formation. 



Formation and locality: Hersey red shale member of the Pembroke formation on 

 west shore of Sipps Bay, south of the highway bridge, Pembroke Township (loc. 

 No. 2.32.9A). 



Cat. No. 58972. 



lAngula minima var. americana Williams. 



Fig. 6. — ^A specimen slightly larger than ordinary (magnified 2 diameters), showing 

 the general form and size of the species. 

 Locality: Same as Figure 5 (loc. No. 2.32.9A). 

 Cat. No. 58973. 



Modiolopsis leightoni Williams. 



• Figs. 7, 8, 9, and 10. — A set of two right and two left valves showing the ordinary 

 expression of the species where it is found in abundance, fluctuating both in form and 

 surface characters. 



Formation and locality: Argillaceous shales in the lower portion of the Pembroke 

 formation. Leighton Cove, Pembroke Township (loc. No. 6.3.8F and M). 



Cat. No. 58974, U.S.N.M. 



Modiolopsis leightoni var. quadrata Williams. 



Figs. 12, 13. — Two left valves showing the ordinary expression of the quadrate form. 

 Locality: Same as figures 7-10. 

 Cat. No. 58975. 



Nuculites corrugata Williams. 



Fig. 11. — A left valve, slightly shorter and ventral margin slightly more arched 

 than ordinary. 



Formation and locality: Gray argillaceous shale of lower part of Pembroke formation 

 at head of Leighton Cove (loc. No. 5.3.8F). 



Cat. No. 58976. 



Fig. 14.— A right valve of nearly normal form, except that the ventral border is 

 rolled under, making the edge nearly straight. 



Locality: Same as figure 11. 

 ' Cat. No. 58976. 



Platyschismxi helidtes Sowerby. 



Figs. 15, 16. — Two views of a specimen somewhat crushed, making it to appear with 

 lower spire than ordinary. 



Formation and locality: Hersey red shale member of the Pembroke formation on 

 eastern shore of Hersey Cove, Pembroke Township (loc. No. 2.42.8A). 



Cat. No. M1243. 



Fig. 18. — A slab showing molds of several small specimens which were probably 

 immature. 



Formation and locality: Hersey red shale member of Pembroke formation on eastern 

 shore Hersey Cove (loc. No. 2.52.3A). 



Cat. No. 58977. 



