110 



IOWA ACADEMY OF SCIENCES. 



and V. simplex is Ptqm edentida alticola, IngersoU. The following are addi- 

 tional species: 



Pupa curvidens, Gld.— Found at Iowa City and Eastport. Rare. 



Fupa edentula, Gld.— Two living specimens of this species were found at 

 Iowa City. 



Pupa procera, Gld. — This species, which is usually distributed under the 

 name P. rupicola, Say, is common in Fremont county at Eastport, and one 

 specimen was found at Iowa City. 



Piqya holzingeri, Sterki.— Very common at Iowa City, Davenport (Prof. 

 Sheldon) and Eastport. One specimen from Eastport is reversed. 



Vertigo tridentata, Wolf. Rare at Eastport. Not rare at Iowa City. 

 This was reported as V. gouldi, Binn. 



Vertigo boUesiana, Morse. Iowa City and Eastport. Rare. 



Family Succinid.e. 

 The form reported as Succinea higginsi, Bid. cannot be considered as 

 distinct from S. ovalis and should be dropped from the list. The very large 

 form heretofore referred to S. avara, which is common in low lands and as 

 a fossil in the Loess, and which sometimes approaches 5'. ohliqua in size, is 

 probably entirely distinct from S. avara and all described species. A 

 thorough study of the shells and anatomy of this form will be made as soon 

 as possible in order that this point may be settled. 



Siiccinea lineata, W. G B. should be added to the list. It is common 

 in the Loess westward, and a few bleached though probably recent speci- 

 mens were found near Hamburg, Fremont county. 

 Family Auriculid.e. 

 Oenus Carychium. 

 C. exiguum var. exile, H. C. Lea. This slender form is common at Iowa 

 City and Eastport, and probably in all other portions of the State in which 

 C. exiguum occurs. 



Faynily Limn.bid.e. 

 Physa lordi, reported on the authority of Call, should be dropped from 

 the list. The specimen proved to be a deformed P. heterostropha, Say. 



Planorbis albus, Muell., reported as rare and only in the northern part 

 of the State; is common in "Cedar Lake" at Cedar Rapids. 

 Family Cyrenid.e. 

 Genus Sphoirium. 

 Twelve species were reported in the former list, but this number must be 

 cut down. S. solidulum, Pr. is without doubt S. sulcatum. Extreme forms 

 differ, but a great number of immediate links can easily be found. S. 

 stami7ieum. Con. as reported, were old S. rhomboidexim. The specimens 

 were named by Call, and included in the list on his authority. Comparison 

 with a series of 8. rhomboideiim, since dredged in the same pond, shows 

 that the shells were old, heavy S. rhomboidetim. 



The true S. stami7ieum, Con. is common at Iowa City, but after an exam- 

 inaton of several quarts of specimens I cannot distinguish this from S. stria- 

 timim, and more than that the S. sulcatum and 8. striatinum series often 

 approach so close together that it is almost impossible to satisfactorily place 

 some species. 



