7 8 COLLI nge: non-operculate land and freshwater molluscs. 



blue. Foot-sole yellow, not divided into medium and lateral planes. 

 Extremity of foot rounded. 



Length (in alcohol) 24 millim., breadth of foot-sole 7 millim. 



Hah. — Summit of Bukit Besar, 3,500 ft.. State of Nawng Cliik. 



One specimen, damaged. 



Although I think this is a new species of Crijptomma, I hesitate 

 to name it, as it was in a very damaged condition when recei\'ed, in 

 fact the only internal parts of its anatomy present were the terminal 

 ducts of the generative organs, and of these I give a figure (PI. iv, 

 fig. 24). The penis is of considerable size, \ery long, and (juite 

 distinct in form from that of any described species. 'Inhere is a small 

 kalk-sac just before the commencement of Lie vas deferens. The 

 dart-gland and dart-sac are proportionally small, at the distal end of the 

 gland there is a short muscle ; a dart, partial ;_,' formed was present in 

 in the dart-sac. 



Rhysota, Albers. 



Rhysota eymatium, Bens. 



Helix ryniafium, Benson, apud Pfr. : Novit. Co ich., i, j). 58, 



pi. xvii, figs. I, 2. 

 Rhij^'ufa I'lpiiatiuiii, Stol. : J. As. Soc. B-ngal, 1873, vol. xlii, 



p. II, pi. i, figs. 1-3, pi. ii, figs. 13-15. 

 Hah. — Penang. 



Hemiplecta, Albert. 



Hemipleeta humphreysiana, Lea. 



PI. iv, figs. 16-23. 



H('mi[)h'ria Inniqilirey'^iaiia, Lea. : Trans. Amer. Phil. Soc, 1841, 

 vol. vii, p. 463, pi. xii, fig. 16. 



Hah. — Kwala Aring, State of Kelantan. 

 vVfter a careful examination of the shells and animals of the s[)ecimens 

 collected, I have come to the conclusion that there are here three 

 distinct forms. Fortunately I have had two or three examples of each, 

 and quite recently I have been able to confirm my observations 

 made some months back. 



Respecting the different forms, which it will be convenient to 

 refer to as A, B, and C respectively, the different characters in the 

 shell were in each case found to be associated with differences in the 

 animal. 



The Shell. — In the form A the apex is fairly high, and the keel on 

 the whorls slightly produced with only a single band below the keel 

 on the last whorl ; generally the whorls are flattened. 



