272 The Ohio Naturalist. [Vol. XIV, No. 5, 



Musculium jayense Prime. Big Reservior, Summit Co. (Rush 



& St.); Midvalc, Tuscarawas Co.; rare (St.). 

 Musculium sphaericum Anthony. Authentic specimens are in 



the T. Prime collection, Mus. Comp. Zool., and in the National 



Museum. A small pond at Wooster (vSt.) ; pools near Geauga 



Lake, and west of Lorain (Allen). 

 Musculium parvum Sterki. Summit, Stark and Tuscarawas 



Cos. (St.). 

 Musculium "sp." = rosaceum Prime. Also: Mishler, Portage Co. 



(Allen); Hudson (Rush); Turkey foot Lake (St.); New Phila- 

 delphia (St.). 

 Pisidium minusculum Sterki. Navarre, Stark Co. (St.). 

 Pisidium regulare Prime. Cuyahoga and Geauga Cos. (Allen) ; 



Lucas Co. (Goodrich); Cincinnati (Anthony collection). 

 Pisidium subrotundum Sterki. Hudson (Rush, St.); ditch on 



Congress Lake (St.). 

 Pisidium. tenuissimum Sterki. Turkeyfoot and Springfield Lakes 



(St.), rather different from the typical Michigan fonn. 

 Pisidium trapezoideum Sterki, in the catalogue, is probably a 



form of P. neglectum. (Typical trapezoideum is eastern). 



Introduced Species. 



Arion hortensis Ferusac. Storrs and Harrison's nurseries, 



Painesville (St.). 

 Stenogyra octona Chemnitz. Greenhouses at Painesville, and 



Akron (St.) 

 Lymnaea (Radix) auricularia Linne. Toledo! (Goodrich). 



Field Manual of Trees by John H. Schaffner, is a convenient 

 pocket manual for the study of trees at any season of the year. 

 It includes in its area Southern Canada and the Northern United 

 States to the Southern boundary of Virginia, Kentucky, and 

 Missouri, westward to the limits of the Prairie. It contains 

 among other things a key to the genera of trees in the summer 

 condition; a key to the genera of trees in the winter condition; a 

 general key to the families and genera based on the flowers; a 

 key to the fruits and a general classification of the wood. A 

 unique feature is the brief but distinctive characterization of each 

 genus by vegetative characters. The publishers are R. G. Adams 

 & Co., Columbus, Ohio. j. h. s, 



