0. H. Ilershey — Florencia Formation. 



Indian Garden locality. Crane Creek locality. 



Fresh- water species. 



Pleurocera subulare Lea. 

 Planorbis parvus Say. 



" bicarinatus Say. 



Valvata tricar inata Say. 

 Limncea humilis Say. 

 Yimpara spec. ? juv. 

 Ancylus tardus Say ? 



" rivularis Say. 



" parallelus Hald. . 

 Pisidium spec. ? 



" walkeri Sterki. 



" cruciatum Sterki. 

 fallax Sterki. 



" punctatum Sterki. 



" compressum Prime. 



" var labile Prime. 

 Campeloma decisa Say, juv. 



" (embryonic). 



Sphcerium staminium Con. ? 



" striatinum Lam. 



Physa heterostropha Say. 

 Bythinella tenuipes Coup. 

 Amnicola povata Say ? juv. 



cincinnatiensis Aulh. 

 Cypris (crustacean). 

 Ostracod crustacean. 



Terrestrial species. 



Hyalinia radiatida Alder. 

 " miniiscula Binn. 

 Helicodiscus lineatus Say. 

 Pyramidida striatella Auth. 

 Pupa contractu Say. 



" corticaria. Say. 



" holzingeri Sterki. 

 Snccinea a var a Say. 

 Carychium exile Ad. ? 



" exiguum Say. 



Yallonia perspectiva Sterki. 

 iStrobilops virgo Pils. 



Pleurocera subulare Lea. 

 Campeloma decisa Say. 

 Pisidium spec. ? 



" variabile Prime. 



" compressum Prime. 



" virginicum Gmel. 



" fallax Sterki. 



" punctatum Sterki. 

 Valvata tricar inata Say. 

 Planorbis bicarinatus Say. 



" parvus Say. 

 Limncea desidiosa Say. 

 Sphcerium solidulum Say ? 



" striatinum Lam. 



" staminium Lam. 



" semile Say. 



Segmentina armigera Say. 

 Physa heterostropha Say. 

 Somatogyrus depressus Tryon. 

 Amnicola cincinnatiensis Auth. 

 Bythinella tenuipes Couper. 



Terrestrial species. 



Vallonia costata Mull. 

 Zonitoicles arbor eus Say. 

 Hyalinia radiatida Aid. 

 " minuscida Binn. 

 " indent ata Say. 

 Pyramidida alternata Say. 



" striatella Auth. 



Helicodiscus lineatus Say. 

 Succinea avara Say. 

 Pupa ventricosa var. elatior Sterki 

 ./^tf contractu Say. 

 ' k holzingeri Sterki. 

 " armifera Say. 

 Polygyra spec. ? 



" hirsuta Say. 



Vertigo indent at a Wolf. 



To the above lists of shells from the Florencia. formation I 

 will add Pisidium abditum Hald ? which was included in a 

 small collection from this horizon made near Bolton several 

 years ago. 



An analysis of the species contained in these lists shows 

 that there are undoubtedly present at least fifty distinct varie- 



