GODWIN-AUSTEN : ON PERAK LAND SHELLS. 367 



the Durgellinse. The character of the anatomy of H. permolle 

 approaches that of Sitala. Stoliczka says of the shell ' ' ad basin 

 striis spiralibus sub-obsoletis notata," and also "the rather strongly 

 elevated spire and membranaceous transparent structure of the shell 

 separate this species from the numerous allied forms of the Philippines." 

 The italics are mine, vide figs. 11-1 U? (PI. XV, Fig. 3). 



H. permolle, Stol., is included by Mr. Collinge in his paper on 

 the mollusca collected by the " Skeat Expedition" in the Malav 

 Peninsula (Journ. Malacology, 1902, vol. iv, p. 73); hab., Gunong 

 Inas, 3000 feet, State of Perak. It was not figured or described. 

 Mr. Collinge says, "This is certainly the mollusc described by 

 Stoliczka, for both externally and internally it agrees with his 

 descriptions and figures." Some mixing of species in submitting 

 them to the British Museum must have occurred. The animal 

 named H. permolle, which I now describe, cannot possibly be the 

 same Mr. Collinge examined and catalogued. Compare the radula 

 figured by Stoliczka of H. permolle, with the central and admedian 

 teeth on quadrate plates, and that of the specimen I received from 

 Mr. E. A. Smith, with its very numerous and similar teeth on very 

 narrow plates, showing generic differences. The shell and genitalia 

 also differ in the two species. 



Further, in order to clear up the doubt hanging over the distribution 

 of the Penang shell H. permolle, with the kind assistance of 

 Dr. S. F. Harmer and Mr. C. L. Boulenger I have been able to 

 examine the specimens under that name in the Cambridge Museum. 

 The tube contained the right number of specimens, but they represented 

 three species. 



(«) One specimen similar to those in the Natural History Museum 

 {Leptodontarion). (PI. XV, Fig. \h, animal and shell.) 



{b) Three specimens which I feel sure from the form of the shell 

 represent H. permolle, yet when compared with Stoliczka's figures 

 on pi. i, figs. 11-113, cannot be that shell, although there are many 

 resemblances indicated in Stoliczka's description of the animal. 

 They possibly belong to the same genus. I now put them both 

 provisionally in Sitala. This genus now holds in the Indian region 

 ("Fauna British India" (Mollusca), 1908, p. 225) some twenty-six 

 species, and of the majority nothing is known of their anatomy. 

 In course of time, as our knowledge increases, it is quite evident 

 they will require to be separated into new generic divisions. 



(c) A shell which much resembles the young of Macrochlamys (?) 

 Toivnsendiana, G.-A. & Nev. 



2. Sitala (?) Gunongensis, n.sp. (shell and animal). PI. XV, 

 Figs. 2-2c. 



Ilal. — Gunong Inas, Perak State ; " Skeat Expedition." 

 Shell globosely conoid, not umbilicated, with well-defined wavy 

 longitudinal striation, strong on base ; colour pale burnt sienna, milky- 

 white on apical whorls ; spire low, sides flat ; apex blunt ; suture 

 shallow; whorls 4, tlie hxst inflated, regularly increasing; aperture 



