710 A. K FOERSTE 



Reticularia pegraniensis\ length 15""", width iq"""; median fold low, but dis- 

 tinct, 5"™ broad anteriorly; median depression shallow; no lateral plica- 

 tions ; concentric lines of growth distinct ; found only at Pegram. 



Delthyris, i species; 8""" long, 10.5°"" wide; median plication of dorsal 

 valve with faint depression along the axis anteriorly; 3 distinct and i 

 indistinct plication on each side ; cardinal angles acute ; surface orna- 

 mentation similar to that of Spirifer crispus\ 12, 16. 



Spirifer oligoptychiis ; the radiating striae are coarser than in Sp. eudora 

 from the Waldron bed, and are not crenulated by transverse lines of 

 growth, 14a, iga. 



Spirifer geronticus ; 20™™ long ; median fold and sinus distinct ; i or 2 on each 

 side at the beak, usually disappearmg within 7""" from the beak ; radiat- 

 ing striae; type from Dixon Spring; 14a, \qa, 49, Pegram. 



Spirifer foggi; 14a, \qa, Pegram. 



Spirifer saffordi; surface orhamented as in Sp. crispus, but the concentric 

 striae are much more distinct ; cited by Whitfield and Hovey from the 

 Meniscus beds of Perry county, Tenn., and by Safford from the Gant 

 locality in Wayne count)', and Bath Springs in Decatur county, formerly 

 a part of Perry county, Gant bed 44. 



Spirifer crispus \ 12, 16, 19a, 40. 



Spirifer crispus variety; concentric striae finer and closer together; shell 

 slightly narrower ; 12, 16, I4<?C 



Atrypa reticularis newsotnensis \ types from Waldron bed at Newsom, Tenn., 

 8 or 9 plications in a width of 10"""; 16, 19, Pegram, I4^C, 39, 40. 



Atrypa reticularis niagarensis \ 12 to 14 plications in a width of 10™'"; i^a, 

 16, 19, iga, 49, 103, Pegram, i^eA. 



Atrypa reticularis arctostriatus \ 28 plications in a width of 10"""; top at 16. 



Atrypa marginalis ; \\a, 15, 16, 18, 19a, 49; similar forms included by Nl 

 telroth under C, Calvini; i/^eA. 



Atrypina, i species; 16, 19a, 21. 



Uncinulus stricklandi \ 12, 16, 21, 43, 46, Gant bed 45, 46, \&,eC, 40, 15^. 



Uncinulus tennesseensis ; shell smaller than stricklandi, usually with fold and 

 sinus more distinct; 12, 14a, 16, 19, 19a, 20, Gant bed 46, Pegram, 

 \\eC, 40. 



Rhynchonella lindenensis ; outline roughly circular; with three plications on 

 fold, 2 in sinus, and 8 or 9 on each side; at 27 near Linden. A similar 

 shell with only 6 or 7 plications on each side occurs at 16 near Browns- 

 port Furnace ; interiors unknown. 



Wilsonia saffordi; \\a, 15, 16, 19, I9<a:, 49, 103, Gant bed 44, 46, \i,eA, \\eC, 

 39. 40. 



Camarotoechia ; similar in form to C. neglecta, but 12™"' long and with the 

 surface apparently smooth ; 1 2, 1 6, 1 9, 1 9a, 27, Gant bed 46, 1 4^C, 38, 40. 



Camarotoechia; cuneate in form, 11 """long; sinus and fold almost imper- 

 ceptible except on direct anterior face of shell ; 12, 16. 



