342 ADDITIONS AND CORRECTIONS. 



Genus PARARHYTIDA Anc. (p. 52). 



Mr. T. D. A. Cockerell has called my attention to the fact that 

 the name Saissetia (p. 53) is preoccupied in entomology (Coccidce\ 

 see Zool. Rec. 1865, and Proc. Amer. Ent. Soc. 1893, p. 54. He 

 proposes to call the molluscan group PLATYRHYTIDA, the species 

 saisseti being its type. 



Genus THYSANOPHORA. 



P. 58, add to synonyms of T. boothiana, H. mauriniana Orb., 

 (" lavalleana" on plate). The reference after T. incrustata should 

 stand : ii, 204. 



Genus POLYGYRA (p. 68). 



Add to list on pp. 76, 77, P. thyroides v. pulchella Ckll., (Journ. 

 of Conch. 1892, p. 39), and 

 P. sanburni W. G. Binn., iii, 145. Kingston, Idaho. 



Genus POLYGRATIA (p. 81). 



Cancel the sectional name Entodma, (p. 83) and the species rey- 

 rei Souv., as a radula received from Prof. G watkin proves it to belong 

 to Streptaxidce. The other species are quite different, and may as 

 well be placed in Systrophia, from which they differ only in the 

 parietal lamina. 



Genus PLEURODONTA, Section Isomeria (p. 93 ). 

 P. meyeri Strubell, Conchyl. Cab., p. 693. 



Genus CAM^ENA (p. 101). 

 C. stolidota Quadr. & Mlldff. Paragua, Philippines.' 



The radula of 0. cicatricosa is figured on pi. 34, fig. 10, from a 

 mount kindly lent me by Prof. Gwatkin. 



Section fseudobba Mlldff. (,p. 105). 

 C. brunonis Kobelt, Conch. Cab., p. 681. Halmaheira, 



Genus OBBA (p. 107). 

 Add H. conomphala Pfr. to synonymy of 0. par mala (p. 109). 



O. viridiflava Mlldff. O. marginata v. nana Mlldff. 



G. subhorizontalis Mlldff. v. pullescens Mlldff. 



O. flavopicta Mlldff. O. moricandi v. rndiata Mlldff. 



O. basidentata v. grandis Mlldff. O. BCrobicuIata v. conoidalis 



Mlldff 



