MOLLUSCA OF OHIO. ^9'» 



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 



lamellae). 

 Zonitoides laeviusculus Sterki, among minusculus . 

 Hyalina wheatleyi Bland, and others, among H. radiatula, 



Zonitoides arbor eus, 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 " puichella." 

 Strobilops affinis Pilsbry and virgo Pilsbry, among labyrinthica. 

 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, pygmcsa-Drap., morsei Sterki, among 



ovata. 

 Vertigo parvula Sterki, bollesiana Morse, among milum, goulJii. 



and others. 

 Carychium exile H. C. Lea, among exiguum, and both species 



among small Pupidse. 

 Physa aplectoides Sterki, among gyrina etc., and Aplexa hyp- 

 no rum. 

 Lymnaea parva Lea, sterkii Baker, among any of the smaller, and 



young, Lymnaeae. 

 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 limosa, 



cincinnatiensis, etc. 

 Valvata bicarinata Lea, among tricarinata. 

 Lampsilis fallaciosa Simpson, among anodontoides. 

 Sphaerium 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." 



