32 



Lieut.-Col. H. H. Godwin- Austen on 



VII. — On a supposed neiv Species o/" llhiostoma _/rom Borneo , 

 ond Notices of Two other- Species of Shells from Palawan. 

 By Lieut.-Col. H. H. Godwin-Austen, F.R.S. &c. 



The Rhiostoma I now describe was collected by Mr. Boxall 

 and was sent by him to Dr. Hungerford, who asked me to 

 describe and name it after its discoverer; but I received it too 

 late to bring into my paper on Bornean shells published in 

 the Proc. Zool. Soc, June 1889, p. 332. 



Rhiostoma Boxalli, sp. n. (Fig. 1, a, 6, c.) 



Loc. Near Kina Balu {Boxall). In Coll. Dr. Hungerford. 



Shell discoid, widely and perspectively umbilicated ; sculp- 

 ture smooth ; colour dark madder-brown, with a few white 

 splotches on the second and third whorls ; spire scarcely 

 raised above the last whorl, apex rounded ; suture deep ; 

 whorls 4, round, rapidly increasing, the last separated for a 



Fio-. 1. 



Nat. size. 



Rhiostoma Boxalli. 

 a. Specimen from Kiua Balu ; b, c. Ditto from Palawan. 



short distance from the penultimate ; the sutural tube short, 

 horizontal; aperture oblique, circular ; peristome double, the 

 inner simple, the outer expanded at right angles to the body- 

 whorl, and curved slightly backwards on the outer margin 

 and with a slight nick near the sutural tube. 



Size : maj. diam, 24*0, min. diam. 16'25, alt. axis 5*75 mm. 



This species comes nearest to R. iris, G.-A. (described in 

 the Proc. Zool. Soc, June 1889, p. 343), in the expanded 

 peristome ; the general form differs, it is not so turbinate or 

 streaked with zigzag markings. 



