iy89.] LAND-SHELLS FROM BORNEO. 353 



Helicina martensi, Issel. 



Helicina citrinal (Pfr.), var., v. Martens, Malak. Blatt. 1873, 

 p. 161. 



Helicina martensi, Tssel, Moll. Born. .\nn. Mus. Civ. Genova, 

 vi. p. 444, pi. vi. figs. 23-25 (1874). 



Georissa, Blanf. 

 X'). itfif-} 59. Georissa hosei, n. sp. (Plate XXXIX. fig. 11.) 



Shell elongately conoid, rather solid, imperforate ; sculpture ill- 

 defined spiral liration ; colour ruddv ochraceous ; spire high ; apex 

 blunt; suture impressed; whorls 4, sides flat, auguhite -above and 

 below on the periphery, the median side of" each whorl being parallel 

 with the axis of the shell, more rounded on the last whorl ; aperture 

 oval, oblique ; peristome simple, somewhat thickened above ; colu- 

 meliar margin strai)ihf. 



Size: maj. diam. 1'5; alt. axis 19 millim. 



Ilab. Borneo (f. Hose, ISj^g). In Brit. Mus. collection. 



The square form of the second whorl is peculiar, and distinguishes 

 it from the other Bornean species. Only two S|)eciiiiens are in the 

 collection. The exact locality I have not yet ascertained ; it 

 occurred a mono; a small collection of shells sent to the British Mu- 

 seum by Mr. Ilose in May 1889, which Mr. Edgar Smith has kindly 

 let me fisrure and describe. 



>3«^ 



106'^ 



60. Georissa williamsi, ii. sp. (Plate XXXIX. fig. 10.) 



Shell elongately ovate, solid ; sculpture indistinct spiral liration, 

 showing strongest on the apical whorl; colour ruddy ochraceous; 

 spire high ; apex blunt, smooth ; suture <vell impressed ; whorls 4|, 

 convex, the last very ample ; aperture oval, oblique ; peristome 

 simple, sharp-edged; columellar margin straight. 



Size: maj. diam. 1"7; alt. axis 2'."^0 millim. 



Hab. Borneo (C Hose). In Brit. Mus. collection. 



Only one example occurred among four specimens of GeorisscB 

 sent by Mr. Hose to the British Museum, one being G. niahensis, 

 and two others of a new species and very distinct form, which I have 

 named G. hosei. I have named this species after Dr. Williams, who 

 served with Rajah Brooke on the first occupation of the country. 



j-^ 61. Georissa niahensis, n. sp. (Plate XXXIX. fig. 8.) 



Shell elongately conoid, solid, imperforate ; sculpture a very in- 

 distinct, ill-defined spiral liration, about 20 on the penultimate whorl, 

 upon a rough surface crossed by transverse lines of growth ; colour 

 ruddy ochre ; spire high ; apex pointed, finely papillate, minutely 

 lirate ; suture impressed ; whorls 4|, convex ; aperture oval, 

 obhque ; peristome simple, acute below ; columellar margin 

 straight. 



Size: maj. diam. 23 ; alt. axis 3'6 miUim. 



Hab. Niah Hills {A. Everett). 



