MOLLUSCA OF OHIO. 399 
SUPPLEMENTARY LISTS. 
In the following list, some Ohio species are enumerated, 
which were not known when earlier lists and descriptive works 
were published, or misunderstood. Specimens are probably 
mixed in among other similar forms, and all such lots in collec- 
tions should be looked over carefully. 
Gastrodonta collisella Pilsbry may be among gularis, and 
ligera; (from the latter it is at once distinguished by its 
lamelle). 
Zonitoides leviusculus Sterki, among minusculus. 
Hyalina wheatleyi Bland, and others, among H. radiatula, 
Zonttoides arboreus, etc. 
Hyalina lamellidens Pilsbry, among multidentata. 
Euconulus chersinus Say, among fulvus, and vice versa! 
Vallonia excentrica Sterki, among pulchella. 
Vallonia parvula Sterki, among costata, and all of these species 
among “ pulchella.’ 
Strobilops affinis Pilsbry and virgo Pilsbry, among /Jabyrinthica. 
Bifidaria procera Gould, as Pupa rupicola Say, and among 
Vertigo. 
Bifidaria holzingeri Sterki, among pentodon. 
Bifidaria pentodon Say, among tappaniana; notice the change of 
names. 
Vertigo tridentata Wolf, pygm@a-Drap., morsei Sterki, among 
ovata. 
Vertigo parvula Sterki, bollestana Morse, among milum, gould1i, 
and others. 
Carychium exile H. C. Lea, among exiguum, and both species 
among small Pupide. 
Physa aplectoides Sterki, among gyrina etc., and Aplexa hyp- 
norum. 
Lymnea parva Lea, sterkii Baker, among any of the smaller, and 
young, Lymnze. 
Planorbis umbilicatellus Cockerell, among parvus. 
Planorbis opercularis multilineatus Vanatta, among dilatatus. 
Planorbis rubellus Sterki, among exacuous. 
Gundlachia species among Ancylus! 
Ancylus, various species, among any in collections. 
Amnicola pilsbryi Walker, and other small forms, among /imosa, 
cincinnatiensts, etc. 
Valvata bicarinata Lea, among tricarinata. 
Lampsilis fallaciosa Simpson, among anodontoides. 
Spherium flavum Prime, and probably others, among striatinum. 
Musculium, various species, among any in collections. 
Pisidium, many species, among any lots on hand, especially 
“abditum Hald.’ 
