32 Lieut.-Col. H. H. Godwin-Austen on 
VII.— On a supposed new Species of Rhiostoma from Borneo, 
and Notices of Two other Species of Shells from Palawan. 
By Lieut.-Col. H. H. Gopwiy-Austen, F.R.S. &e. 
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. 
fhiostoma Bowalli, sp.n. (Fig. 1, a, 6, c.) 
Loc. Near Kina Balu (Bowall). 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 
Fig. 1. 
Nat. size. 
> al 
Rhiostoma Boxall. 
a. Specimen from Kina Balu; 8, ec. 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. cris, 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. 
