340 DR. O. F. VON MOELLENDORFF ON [June '.i, 



almost mucronate, the mouth much more protracted to the ri<;ht, 

 the upper parietal lamella much smaller and uot, as in P. artata, 

 covering the upper canal ; the outer margin of the peristome is more 

 receding above, forming a decided, almost tooth-like angle before it 

 recedes. All these differences are quite constant in the dozen of 

 examples which I have examined and entitle the form to specific 

 distinction. Judging from de Morgan's figure, they belong to the 

 following species. 



81. PupiNA TCHEHELENSis, de Morgan. 



Papina tchehelensis, de Morgan, Bull. p. 66, t. iii. fig. 4. 



Pupina artata, v. ]\IulldfF. 1. c. p. 314 (won Benson). 



Mt. Tcheoel {de Morgan); Bukit Pondong {Hungerford). 



82. COPTOCHILUS SECTILABRUM, Gould. 



Perak (Townsend) ; Larut (coll. Ind. Mus.}. Known from Penang, 

 Tenasserim. 



83. Hybocystis elephas, de Morgan. 



Hybocystis elephas, de .Morgan, Le Nat. 1885, p. 70 ; Bull. p. 56, 

 t. iii. fig. 1 ; Fischer, J. de Conch. 1885, p. 174, t. x. (anat.) ; Crosse, 

 ibid. p. 183, t. xi. ; v. MoUdfT. 1. c. p. 314. 



Valley of Perak river (de Morgan) ; Larut (coll. Ind. Mus.). 



Ilifbocgstis jousseaumi, de Morgan (Le Nat. 1885, p. 70; Bull, 

 p. 57, t. iii. fig. 2), from the same locality, appears to be based on 

 smaller and dead specimens and is to be suppressed (cf. v. Moildff. 

 1. c. p. 315 ; Crosse, J. de Conch. 1887, p. 2/5). 



Fam. Hydrogen I D.E. 



84. Georissa monterosatiana, Godw.-Aust. & G. Nev. 

 Georissa monterosatiana, Godw.-Aust. & G. Nev. P. Z. S. 1879, 



p. 738, t. lix. fig. 6 ; v. Moildff. 1. c. p. 316. 

 Bukit Pondong (Townsend, Hungerford). 



85. Georissa semisculpta, Godw.-Aust. & G. Nev. 

 Georissa semisculpta, Godw.-Aust. & G. Nev. P. Z. S. 1879, 



p. 740, t. lix. figs. 3, 3 a. 

 Bukit Pondong (Townsend). 



Fam. Ampullariid.e. 



86. Ampullaria turbinis, Lea, var. subampullacea, G. Nev. 

 Ampullaria turbinis, var. subampullacea, G. Nev. Handl. Moll. 



Ind. Mus. ii. 1884, p. 6. 



Ampullaria sumatrensis, de Morgan, Bull. p. 70. 



Perak (Townsend). Malay Peninsula generally (de Morgan). 



Ampidlaria perakensis, de Morgan (1. c. p. 70, t. iv. fig. 12), and 

 A. wellesleyensis, de Morgan (1. c. p. 71, t. iv. fig. 13), are probably 

 young shells. 



