144 



The interior of the large valve has a decided internal costa 

 running transversely, and a folded pleat in the posterior margin. 

 The shell bears a striking relationship to the modern Lorica volvox 

 of Reeve. 



18. Acanthoehiton, sp. indet. 



One median valve. 



Latero-pleural Area covered with triangular elongated, flattened 

 pustules. 



The Lateral Area is slightly raised. 



The insertion plates are large, being more than half the width 

 of the latero-pleural area. 



The Dorsal Area is broad wedge shape, but very much worn. 



Measurement. — Width, 8 mm.; length, 5 mm.; divergence, 

 130°. 



Bemarks. — This specimen bears a strong resemblance to 

 A. crocodilus, Torr and Ashby. 



Locality. — Muddy Creek. 



19. 



Five valves from Muddy Creek, and one valve from Schnapper 

 Point, all very worn. 



