246 On new Species of Land- Mollusca from Borneo . 
This very beautiful shell is another spined form, a com- 
petitor for the admiration of the conchologist with Opistho - 
stoma grandespinosa, lately described by me ; in this species 
the spines are not so large and have more the character of 
raised rings. 
OpistJiostoma Hosei , sp. n. (PL 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 ((7. Hose). 
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 with which I am acquainted. 
Diplommatina Aldrichi , sp. n. (PI. VII. fig. 3.) 
Shell elongately turreted, rather solid ; sculpture strong dis- 
tant costulation ; colour dull ochre ; spire becoming rapidly 
pointed, apex sharp ; suture well impressed; whorls 8, convex, 
the constriction in centre above the aperture, penultimate the 
largest and rapidly decreasing in size above ; aperture ovate- 
vertical ; peristome double, expanded ; columellar 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 cc List 
of Shells from Borneo,” published in the 6 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 does not agree 
■with Adams's species. 
EXPLANATION OF PLATE VII. 
Fig. 1. Opisthostoma pulchella, sp. n., X 12. 
Fig. 2. Opisthostoma Hosei , sp. n., X 12. 
Fig. 3. Diplommatina Aldrichi , sp. n., X 7. 
Fig. 4. Fhiostoma iris , Godw.-Aust., X 2*5. 
Fig. 5. Fhiostoma Hungerfordi , Godw.-Aust., X 2*5. 
