33 



Dall, Br>^ant Walker, the writer will work up our Pisidia, 

 which are the most neglected of all North American Mol- 

 lusca, and he expects to obtain materials from all parts of 

 the continent, and especially from our state. 



In August 1893, while collecting in the Auglaize river, 

 at Wapakoneta, O., I found a very beautiful Sphaerium, 

 which ma)^ be the true Sph. solidiilum Pr. ; j-et this is some- 

 what doubtful, as a few specimens from the author himself, 

 named solidHliini. closely resemble what we take for Sph. 

 staviineuiii Con. Most specimens received under the name 

 of Sph. solidulum, are .some form of Sph. striatinum Lam. 

 The Scioto river, at Columbus, seems to contain quite a series 

 of different forms of this group. To judge definitely about 

 them, whole suites from young to adult, and in good num- 

 bers should be at hand from as many places as possible. 



At New Philadelphia, in pools and ditches, there are 

 several forms of Spli cerium partumeium Say, some of them 

 so considerably different from the type, that they may be dis- 

 tinct, and such will probably be found throughout the state. 

 Only by studying rich materials from many different places 

 it will be possible to come to conclusions as to their real 

 affinities. 



The same must be .said of Sphcrrium (Calyculina) 

 sphczriaini Anth. which is known onl}- from the Black river, 

 in Ohio. 



In the Tuscarawas river there is a new species of An- 

 cylus, rather common, very small, only two mill, long; the 

 shell rather elevated with the sides parallel. Very probably 

 it lives also in other parts of the country, and has been over- 

 looked, or taken for the young of some other species, for its 

 minute size. It is named Ancylus exiguus (n. sp.) 



As to a GiDidlacJiia found in this vicinity, I refer to the 

 printed list of the Tuscarawas county mollusca, with notes. 

 (No. 78.) 



Also in the Tuscarawas river another minute Gundlachia 

 has been found in November past, about which considerable 

 discussion has been had with leading scientists. Only four 

 examples were collected, all dead shells, but in good condi- 



