1895.] BORNEO AlfD NBIGHBOUBIXG ISLANDS. 125 



78. CiCLOTUS LINIT0S, Grodwin-Austeii. 



Cyclotus linitus, Godwin-Austen, Proc. Zool. Soc. 1889, p. 345, 

 pi. xxxvi. fig. 3. 



Hah. Mount Eabong, West Sarawak. 



Some of the specimens from this locality are larger than the 

 types from Busau, being 10 millim. in their greater diameter. 

 With the exception of the apes, they are entirely coated with the 

 thick earthy deposit, which is possibly to some extent protective. 

 The body-whorl descends in front, and is slightly detached from 

 the penultimate at the aperture. 



79. Helicina usukanensis, Grodwin-Austen. 



Helicina usuJcamnsis, Gr.-A. Proc. Zool. Soc. 1889, p. 352, 

 pi. xxxix. fig. 7. 



Hah. Mengalun Island, Usukan Island, Banguey Island, Man- 

 tangak Island, and Palawan ; also Sibutu and Bilatan, Sulu Islands 

 (A. Everett). 



The specimens from Sibutu and Bilatan were at one time 

 supposed to belong to H. contermina, Kobelt \ That species, 

 judging from the description, appears to be somewhat more globose, 

 and the keel is said to be thread-like ("carina fiUformi"). 

 Perhaps a comparison of specimens, however, may yet show that 

 they really are the same as that species. I have no hesitation in 

 placing all the specimens from the above localities under H. 

 imikanensis, although there are slight differences in size and the 

 colour is variable. It may be uniformly yellowish or pinkish red, 

 but the keel is always whitish, and a narrow reddish zone beneath 

 the carina is more or less visible in most specimens. 



80. GrEORISSA ETEEETTI. (Plate IV. fig. 15.) 



Testa turhinata, imperforuta, rufescens, lineis obliquis minute 



decussata ; anfractus 4, perconve.n, primus Icevis, ylohosus, 



ultimus antice subdescendens ; apertura rotunde ovata ; peristoma 



ienue, marginibus callo tenui jmictis, columellari pallido, refiexo. 



Longit. 2 miUim., diam. li : apertura 1 hnr/a, | lata. 



Hub. Eumbang, W. Sarawak. 



Only a single specimen of this pretty species was collected by 

 Mr. Everett. It is distinguished from all the other Bornean 

 species by the decussation of the surface, formed by the mmute 

 curved lines of growth being crossed by others obliquely sloping in 

 the opposite direction. Under a powerful lens the points of 

 intersection appear somewhat granulous. 



81. Geoeissa banguetensis. (Plate IV. fig. 16.) 



Testa turbinata, rufescens, fere Icevis ; anfractus 4, perconve.ii, 

 sutura profimda sejimcti, lineis incrementi obliquis substriati, 

 primus subglobosus) apertura oblique semiciraularis ; peristoma 



1 Ann. Mag. Nat. Hist. 1894, vol. xiii. p. 59, pi. iv. figs. (5, 6 a. 



