346 DR. O. p. VON MOELLENBORFF ON [Juiie L;, 



almost mucronate, the mouth much more protracted to the right, 

 the upper parietal lamella much smaller and not, 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 dififerences 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. 



Pupina tchehelensis, de Moi'gan, Bull. p. QQ, t. iii. fig. 4. 



Pupina artata, v. MolldfF. 1. c. p. 314 {non Benson). 



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



82. COPTOCHILUS SECTILABRUM, Gould. 



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

 Tenasserim. 



83. Hybocystis elephas, de Morgan. 



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

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

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



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



Hybocystis 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. Molldff. 

 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. MoUdfe. 1. c. p. 316. 

 Bukit Pondong {Townsend, Hungerford). 



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

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



p. 740, t. hx. figs. 3, 3«. 

 Bukit Pondong {Townsend). 



Fam. AMPtlLLARIIDiE. 



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). 



Ampullaria 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. 



