Fauna of the Morrow Group 
89 
Pterinopecten papyraceus 
Leiopteria longirostris 
Posidonomya 2 sp. 
Chaenocardiola Footii 
Ctenodonta laevirostris 
Myalina 4 sp. 
cf. 
Myalina 3 sp. 
Nucula 2 sp. 
cf. 
Nucula 2 sp. 
Nuculana stilla 
cf. 
Leda bellistriata 
Posidoniella 3 sp. 
Sanguinolites tricostatus 
cf. 
Sphenotus halensis 
Schizodus antiquus 
cf. 
Schizodus morrowensis 
Solenomya costellatus 
cf. 
Solenomya sp. 
Parallelodon semicostatus 
cf. 
Parallelodon 3 sp. 
Pseudomusium fibrillosum 
Macrocheilina 3 sp. 
Dimorphoceras 3 sp. 
Epphipioceras clitellarium 
Gastrioceras 2 sp. 
cf. 
Gastrioceras 3 sp. 
Glyphioceras 11 sp. 
Nomismoceras spirorbis 
Orthoceras 5 sp. 
cf. 
Orthoceras sp. 
Coelonautilus quadratus 
Prolecanites 2 sp. 
Temnocheilus 2 sp. 
Bellerophon Urei 
cf. 
Bellerophon 2 sp. 
As thus listed, the differences between the two faunas appear 
about as significant as the likenesses. The Pendleside is largely 
a molluscan fauna while the molluscs are numerically inferior 
in the Morrow. Moreover, the residual element of the latter 
is not represented by comparable forms in the Pendleside fauna. 
If the faunas are contemporaneous they must have developed 
either in isolated basins or under very different environmental 
conditions. 
DESCRIPTIONS OF SPECIES 
COELENTERATA 
ZAPHRENTID^ 
Genus ZAPHRENTIS Rafenesque 
Zaphrentis gibsoni White 
Plate /, figures 1-2. 
1884. Zaphrentis Gibsoni. White, 13th Rep. Geol. Surv. Ind., p. 117, pi. 
23, figs. 4-5. 
Coal Measures: Vermilion County, Indiana. 
