160 BULLETIN OF THK 



Bulimulus Schiedeanus, Pfeiffer. (p. 391.) 



Plate III. Fig. K. 



Jaw sli;,'litly arcuate, ends scarcely attenuated, Ijluut ; anterior surface with 

 17 rilis, denticulating either niarj^in. It is dilUcult to decide the exact charac- 

 ter ol" these ribs. I have usually called the ribs in Baliiiialus, Cijlindrdla, etc. 

 narrow and widely separated. They should perhaps be described as very 

 broad, with narrow interstices, and with a ^ijradual increase of thickness tt)wards 

 their outer longitudinal margin. This plaiidy thickened margin is w hat I have 

 formerly described as narrow ribs. In the jaw before me there is no tendency 

 to obliiiue arrangement of the ribs at the upper central portion. 



The lingual membrane (see plate) is hmg and narrow. Teeth of the same 

 type as described by me under Bid. dcalbatas, Say, in Vol. V. 



Bulimulus multilineatus, Say. (p. .395.) 

 Mexico (Fischer and Crosse). 



Orthalicus undatus, Brcg. (p. 408.) 

 The upper ligure of Plate LIV. is referred by Von Martens to 0. Ferussaci. 



Succinea ovalis, Gould, (p. 417.; 



To the synonymy add : — 



S. Calumttcnsis, Calkins, Valley Naturalist, Vol. I. No. 2, p. 1, with a figure. St 

 Louis. 



PruRious Species of Helicid/E. (p. 4.31.) 



Clausilid anolcjiia, " L'Anieriquc Uusse" is a typographical error for " L'Armcnie 

 Kusse." ZoiJl. Itee., 1881. 



In the following list T have incorporated all the foregoing additions and 

 alteraticms. 



