342 ADDITIONS AND CORRECTIONS. 



Genus PARARHYTIDA Anc. (p. 52). 



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

 the name Saixsetia (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. maiiriniana Orb., 

 (" lavalleana " on plate). The reference after T. incrnstata 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 Entodina, (p. 83) and the species rey- 

 rei Souv., as a radula received from Prof. Gwatkiu 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. 



Genns 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 Pseudobba Mlldff. (p. 105). 

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



Genus OBBA (p. 107). 

 Add H. conomphala Pfr. to synonymy of 0. jx.irm.ii fa (p. 109). 



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



G. subhorizontalis Mlldff. v. pallescens Mlldff. 



O. flavopicta Mlldff. O. moricandi v. radiata Mlldff. 



O. basidentata v. grandis Mlldff'. O. scrobiculata v. conoidalis 



Mlldff. 



