PLATE 20 



Spirifer cf. concinnus Hall 



Page 85 



1-3 Internal casts of shells having some of the characters of this species 



4 An exterior of the dorsal valve 



Locality. Near Soccatean point, Moosehead lake 



Spirifer aroostookensis Clarke 



(See plates 30, 34) 

 Page 85 



5 Fragment of exterior of a ventral valve showing the flat depressed or 



sulcate ribs and narrow radial grooves 

 Locality. Tomhegan point, Moosehead lake 



Spirifer primaevus Stciningor var. atlanticus Clarke 



(See plate 19) 

 Page Bi 



6, 7 Enlargements of the fimbriate sculpture from different specimens. 

 6, x 5 ; 7, x 10 



Spirifer sp. ? 



Page 85 



8-14 A series of illustrations of a small, transversely elongate species 



whose specific relationships are not clearly determined 

 Locality. Telos lake dam 



Leptocoelia flabellites (Conrad) 



(See plate 34) 

 Page 8 1 



15 Ventral aspect of an internal cast with part of the shell adhering, x \y z 



1 6 Dorsal aspect of the exterior. These two shells are not satisfactory 



illustrations of the species and the drawings give them much the 

 aspect of a Coelospira, but this is an entirely misleading effect, over- 

 looked in the correction of the workmanship. 



17, 1 8 Dorsal and ventral sides of an internal cast. Compare with speci- 

 mens from the Pine Hill Oriskany on plate 34. 

 19 Interior of dorsal valve showing structure of cardinal process 

 Localities as noted on page 81 



206 



