246 On new Sj^ecies of Land- Mollusca from Borneo. 



This very beautiful shell is another spined form, a com- 

 petitor for tlie admiration of the conchologist with Opistho- 

 stoma graiuJespinosa, lately described by me; in this species 

 the spines are not so large and have more the character of 

 raised rings. 



Opisthostoma Hosei, sp. n. (PI. VII. fig. 2.) 



Shell pyramidal, very narrowly perforate; sculpture of the 

 upper whorls quite smooth, the free portion of the last being 

 strongly costulate, the ribs near the aperture being in high 

 relief; colour shining ochre; spire conic, flat-sided, apex 

 blunt ; suture shallow ; whorls 5, flat, the last free, with con- 

 siderable twist, compressed, producing a keel ; aperture 

 circular; peristome widely expanded. 



Size: major diam. 1'8 ; alt. axis 1"6 millim. 



Locality. Baram district, Borneo [C. IJose). 



This is another very distinct form from the same part of 

 Borneo. In the very smooth surface of the first five whorls 

 it is unlike any species Avith which I am acquainted. 



Diplommatina Aldriclii^ sp. n. (PI. VII. fig. 3.) 



Shell elongately turreted, rather solid ; sculpture strong dis- 

 tant costulation ; colour dull ochre j spire becoming rapidly 

 pointed, apex sharp ; suture well impressed; Avhorls 8, convex, 

 the constriction in centre above the aperture, penultimate the 

 largest and rapidly decreasing in size above ; aperture ovate- 

 vertical ; peristome double, expanded ; columcllar margin 

 vertical and angulate below. 



Size: maj. diam. 1*75 ; alt. axis 3'75 millim. 



Locality. From either the Kusan or Penggiron districts, 

 S.E. Borneo {William Doherty). 



This shell is identified as D. concinna, H. Adams, in " List 

 of Shells from Borneo," published in the 'Journal of the 

 Cincinnati Society of Natural History,^ April 1889, p. 25, by 

 Mr. T. H. Aldrich. This gentleman has very kindly sent 

 his specimen to me to examine, and this I find docs not agree 

 with Adamses species. 



EXPLANxVTlON OF PLATE Ml. 



Fi'ff. 1. Ophfhostoma jmMiella, SY>- ^^- X 1-. 



I'u/. 2. Opift/iosfoDia Jlosei, sp. n., X 1-. 



7'Vy. 3. Diphmimatiiia Aldiichi, sp. n.. X 7. 



Fitj. 4. lihiostoma iris, Godw.-An:?t., X 2 5. 



Fiy. 5. Ii/iivffu}na JIuuijcrfordi, CKuiw.-Aust., X 2'0. 



