ART. 4 CAMBRIAN CONCHOSTRACA — ULRICH AND BASSLER 115 



Page 

 T'iGURE 9. Indiana curta, new species 81 



Left valve showing the short, broadly ovate outline 

 chiefly relied on in distinguishing this form from 

 /. faba. 

 10-14. Indiana f aha, new species 79 



10, 11. Views of the right and dorsal sides of a complete 

 carapace. Valves slightly compressed so that the 

 gap of the ends is narrower than normal. 



12. Anterior views of another complete example show- 

 ing gaps. 



13, 14. Left and dorsal sides of a third specimen 

 retaining both valves but compressed so as to close 

 the gaps of the ends. The surface, when perfectly 

 preserved, in minutely punctate. 



15. Indiana faba intermedia, new xaxieiy 80 



The right valve on which this variety is founded. 

 From typical examples of the species it differs in 

 postcardinal part of outline, in lesser convexity of 

 central part of valve, and in more distant arrange- 

 ment of surface punctae. 



16. Aluta (?) rimulaia, new species 61 



A complete carapace, X 4, flattened out in the shale. 

 Middle Cambrian (33 m) (Ross Lake shale): 3 mi. 

 southwest of head of Lake Louise, Alberta. 



17. Lepidilla anomala Matthew (see pi. 7, figs. 20-23) 100 



The type X 6. Middle Cambrian (Acadian, Clc2) 



Hanford Brook, New Brunswick. 



18, 19. Lepiditta curta Matthew (see pi. 7, fig. 29) 95 



Matthew's types X 6. Middle Cambrian (Acadian, 



Cldl) : Porters Branch, St. Martins, New Brunswick. 



20. Lepiditta ? auriculata Matthew (see pi. 7, fig. 26) 96 



The type specimen, X 6. 



Middle Cambrian (Acadian, Clc): Hanford Brook, 

 New Brunswick. 



21. Lepiditta ? sigillata Matthew (see pi. 7, fig. 27) 96 



Photograph of the type X 6. 



Lower Cambrian (Hanfordian, C163) : Hanford Brook, 

 New Brunswick. 



