1831.] Mollusca of the Indo -Malay an Fauna. 133 



Subgenus Acusta, Albers. 

 In my Hand-list, p. 45, I have 'erroneously classed this group as a 

 subgenus of Manilla. It is, however, a subgenus of Helix, not of Mcminn ; 

 I overlooked a note to that effect by Prof, von Martens, Moll. Ost-Asien, 

 describing the jaw, &c. 



Trochomorpha percompressa, Blanford, PI. V, Fig. 22. 

 Proc. Zool. Soc. 1869, p. 448, Bharao, "coll. J. Anderson." 

 I know of no other specimen but the type, of which I now give a 

 figure. 



Helix (Aegista) perplanata, G. Nevill, PI. V, Fig. 21. 

 J. A. S. B., 1877, p. 19, Mimboo, Upper Burma, diam. 17£, axis 4^ mil. 

 I now give a figure of the type of this species, which is closely 

 allied to the Indian H, tapeina on the one hand and to the Chinese H. 

 trichotropis on the other. It was discovered by Dr. Anderson at Mimboo, 

 near the Yunnan frontier. In my Handlist, I have classed this group 

 under the subgenus Plectotropis, Martens (1860, type H. elegantissima, 

 Pfr.), but I now consider that it is not separable from the previously described 

 Aegista, Albers (1850, type H. ocuhis, Pfr.) ; Prof. Martens has lately given 

 an important tabular arrangement of Aegista (restr.) in his c Conch. Mitthei- 

 lungen', Bd. I, Heft. 5-G, with figures and descriptions ; I fancy, however, 

 the professor has overlooked an important locality I have recorded for H. 

 trichotropis, viz., Upper Burma; perhaps, too, the localities recorded for 

 S. setocincta " Sando and Ava" are printer's errors for those given by A. 

 Adams as " Sado and Awa-Sima" ; at any rate, I do not suppose Ava 

 in Upper Burma or Sanda in Yunnan are intended. 



Subgenus Acavus, Montfort. 



The specimens of some of this group in the Indian Museum are in- 

 correctly registered in my Hand-list, page 8 ; the entries should be corrected 

 as follows : — 



Helix (Acavus) h^mastoma, Linnaeus. 

 Syst. Nat. X, 1758 ; Reeve, Con. Ic. fig. 366 and Conch. Indica, pi. 127, fig. 2. 

 30 Ceylon ; coll. H. F. Blanford and G. Nevill, Esqrs. 



var. melanotragus, Born. 

 Index and Test. Mus. Vindob. 1780, as H. melanotragus ; Reeve, I. c. fig. 3G6 C. 

 and Conch. Indica, pi. 127, fig. 3. 



10 Ceylon ; coll. H. F. Blanford and G. Nevill, Esqrs. 



18 



