70 Cincinnati Society of Natural History. 



176 C3'clora miuuta, Hall. L. mimitus, small. 



177 parvula, Hall, L. parvulus, dim. of parvus, small. 



178 depressa, Ulrich. L. depressus, depressed. 



Genus Cyclonema, Hall. Gr. huklos, a circle; nema, thread. 



179 Cyclonema bilix, Hall. L. bilix, a double thread, 

 ISO conicum, S. A. Miller. L. conus, a cone. 



181 liuctuatum, James. Jj. Jluctuatus, waved. 



182 Montrealensis, Billings. 



183 percarinatum, Hall. h. per, carina. 



184 Phsedra, Billings. Mythological. 



185 pyramidatum, James. L. pyramidatus, pyramidal. 



186 varicosum, Hall. L. varicosus, full of veins or ridges. 



187 ventricosum, Hall. L. ventricosus, swollen. 



188 minus, James. L. minor, less. 



189 transversum, Ulrich. L. transversus, transverse. 



Genus Ilolopea, Hall. Gr. holos, entire; ope, aperture. 



190 Holopea paludinaformis, Hall. h. paludina, a river snail ;/o>•mr^ 



191 obliqua, Hall. L. obliquus., awry. 



Class Petropoda. Gr. pteron, a wing; pous, podos^ a foot. 

 Order Thecosomata. Gr. theke, a sheath; soma., body. 

 Family Conulariidcc. L. conulus, a little cone. 



Genus Conularia. L. conulus. 



192 Conularia papillata, Hall. L. papilla.^ a nipple. 



193 Trentonensis, Hall. 



194 formosa, Miller and Dyer. L. formosus, beautiful. 



Class Lamellibranchiata. L. lamella, a plate; Gr. bragchia, gill. 



Division Asiphonata. Gr. a, not; sijyhon., a tube. 



Family Ambonychiidoe. Gr. ambon, the umbone; onuchs, :i tnk)n. 



Genus Ambonychia, Hall. 



195 Ambon^'chia costata, James. L. costatus, ribbed. 



196 Casei, Meek and Worthen. 



197 bellastriata, Hall. L. bellus, pretty; .stria, a ridge. 



198 obtusa, Hall. L. obtusus, blunt. 



199 radiata, Hall. L. radiatus, having ra^'s. 



200 retrorsa, S. A. Miller. L. retrorsus, turned back. 



