112 COL. R. H. BEDDOME ON NEW [Mar. 5, 



3. Descriptions of Land-Shells from the Island of Koror, 

 Pelew Group. By Col. R. H. Beddome. 



[Received February 19, 1889.] 



(Plates XI. & XII.) 



The following interesting shells were collected for Dr. Hungerford 

 by Mr. Gibbon, who resides in Koror, or Coror, one of the Pelew 



Islands. 



1. DiPLOMMATINA LUTEA, Sp. UOV. (Plate XI. figS. 1, 1 fl.) 



Shell sinistral, broad ovate, not rimate, thick, yellowish, irregularly 

 blotched with black towards the apex : whorls 6|-7, gradually in- 

 creasing downwards, the penultimate being the largest ; sculpture a 

 fine, close, regular oblique striation across all the whorls, last whorl 

 ascending much on to the penultimate ; a slight constriction on the 

 penultimate, just above the columellar margin : peristome very thick, 

 3 breadth of shell, dilated at its outer margin ; inner lip much ex- 

 panded, shining, continuous round the apex of the aperture, where it 

 is faintly striated across : aperture vertical, subquadrate, furnished 

 with a tooth-like process on the columellar margin, which is lamella- 

 like, running back into the shell. Length 3i millim. 



Hab. Koror. 



The peristome of this and the five following species is of very 

 great thickness in comparison with the size of the shell, much more so 

 than in any Indian species with which I am acquainted; it might be 

 misguiding to describe the peristome as double in these species when 

 the outer margin is dilated, and single when there is no dilatation, 

 as this dilatation certainly varies in different individuals of the 

 same species and may be altogether absent, or more or less prominent 

 in the same species. 



I do not see how the subgenus Palaina can be kept up for these 

 Pacific species of Biplommatina, as they differ more amongst them- 

 selves than many of them do from Himalayan forms, and the same 

 may be said of Diancta and Paxillus. 



2. DiPLOMMATINA PLATYCHEiLtTs, sp. nov. (Plate XI. figs. 2, 

 2 a.) 



Shell sinistral, ovate, fusiform, thick, iuconspicuously rimate, dull 

 brick-coloured : whorls 6|-7 : sculpture, the upper 14-2 minute 

 whorls glabrous or very finely striated, the 3rd and 4th with prominent 

 coarse, rather thick ribs, the antepenultimate partly furnished with 

 similar ribbing, and partly with a close fine striation, penultimate 

 finely striated, the last whorl furnished with a few swollen convex 

 ribs ; penultimate much the largest and most swollen, with a slight 

 constriction above the columellar margin ; last whorl not ascending 

 much on to the penultimate : peristome very thick, about g breadth 

 of shell, finely costulate outside, the inner lip continuous : aperture 

 much broader than high, transversely auriculate, narrowing inwards 



