PLATE 16 



Modiomorpha odiata Clarke 



(See plate 1 5) 

 Page 74 



1-4 Internal casts of both valves showing the umbonal tooth and socket 

 and the long posterior dental ridge and grooves 

 Locality, Matagamon lake, east side, i mile above dam 



5 A small right valve 



Locality. Matagamon lake dam, south side 



Leptodomus prunus Clarke 



Page 76 



6 Expanded conjoined valves 

 Locality. Blind Cove point 



Ditichia cf. elliptica Maurer 



Page 78 



7, 8 Internal casts of both valves showing the extreme development of 

 the clavicular ridges and the broad row of ligament pits 

 Locality. Matagamon lake, east side, i mile above dam 



Cypricardella parmula Clarke 



Page 77 



9-12 A series of internal casts showing the form of the shell and the 

 nature of the hinge 

 Locality. Near Soccatean point, Moosehead lake 



Prosocoelus cf. orbicularis Beushausen 



Page 75 



13 Sculpture cast of a right valve 



Locality. Tomhegan point, Moosehead lake 



Prosocoelus pes-anseris Zeiler & Wirtgen var. occidentalis Clarke 



Page 7s 



14, 15 Sculpture and internal casts of this species 

 Locality. Tomhegan point, Moosehead lake 



19S 



