474 Records oj the Indian Museum. [Vol. XXII, 



lyig. Gyyanltis co>ivexiiisciiliis, Annandalu and Frasliad, Rec. Ind. 



Mus. XVUI, pp. 52-54, figs. 6c, -jb, 8l>. 

 IQ20. Gyratiltis coiivexiiisciiltis, Annandale, Rer. Ind. Mm. Will, 



p. 14S. 



As has been recently shown by Dr. Annandale and myself 

 the correct name for the species identified as Planorbis compres- 

 sus by von Martens is G. convexiuscuhis. In the same paper we 

 have published figures of the shell, the radula and the genitalia. 

 I have now compared a shell from Makassar, Celebes, identified 

 l)y the late Dr. E. von Martens as P. compressus with Indian and 

 Mesopotamian specimens and have no doubt that they are identi- 

 cal. 



The specimens before me are from freshwater areas at Padang 

 Boelan and from Anak Laut (a fresh-water lake) at Sabang. 



Gyraulus sumatranus (v. Martens). 



1897. Planorbis sumaivanus. v. Martens, op. cit., p. 12, pi. i, figs. 8- 

 10 ; pi. xii, figs. 6-q. 



An examination of one of von Martens' co types from Danau 

 di bawah, Sum.atra, has confirmed my impression that this species 

 also belongs to the genus Gyraulus and not to Planorbis, as von 

 Martens believed. 



In the present collection the species is represented by a 

 number of small specimens from Anak Laut (Sabang), collected 

 along with those of P. convexiusculus and G. proclivis. 



Gyraulus proclivis (v. Martens). 



1897. Planorbis proclivis. v. Martens, op. cit.. pp. 12, 13, pi. i, figs. 

 II -if). 



This species also belongs to the genus Gyraulus. The few 

 specimens of it were collected along with those of the other two 

 species of the genus in the freshwater lake Anak Laut (Sabang). 



Genus Segmentina, Fleming. 

 Segmentina calathus (Benson). 



1897. Planorbis {Segmentina) calatlius, v. Martens, op. cit., p. 15. 

 19x7. Ses;nienfina calailiiis, Annandale and Prashad, Rec. Ind. Mus. 

 XVIII, pp. 56, 57, figs. 5D (not Ij)and8C. 



A few dry shells of this widely distributed species are repre- 

 sented in the collection from near Medan. The specimens are all 

 rather small in size, and are of a shining amber colour. 



Genus Physastra, Tapparone-Canefri. 



In a recent paper Annandale ' has discussed the question of 

 the synonymy of the genus Bullinus. Shortly before this Hedley ^ 



1 Rec. Ind. Mus. XV, pp. 167, 16S (1918). 



2 Rec. Aust. Mus. XII, p. 18, pis. i, ii (1917). 



