1895.] BOEIflO AXK yEIGHBOI"BI>'G ISLAyDS. 103 



angulato-hmata, ohliqua; peristmna temmsimiim, margins 

 columellan siqyra umhilicum hreviter refiexo. 



Diam. maj. 29 millim., mi7i. 26'5, alt. 16. 



Hab. Mount Eabong in the south-western part of Sarawak. 



This species, which may possibly be a dextral Bi/aJcia, is quite 

 distinct from H. det^sa or H. egeria. It has a more raised spire 

 than the latter, is more strongly sculptured both aboA-e and beneath, 

 and is less glossy upon the under surface. B. densa is more 

 widely umbilicated, is differently sculptured, and has much more 

 rapidly enlarging whorls, which also, in shells of the same dimen- 

 sions, are fewer in number. 



8. Dtakia trNDSTEDTi (Pfelffer). (Plate II. fig. 10.) 



Eelix lindstedti, Pfr. Proc. Zool. Soc. 1856, p. 387 ; Mon. Hel. 

 vol. iv. p. 31. 



Rah. Malacca (Pf>'.) ; Penrisen Mountain, Sarawak, up to 3500 

 feet (A. Everett). 



Two varieties were collected at the above locality by 3Ir. Everett. 

 Both are represented by dextral and sinistral specimens, the 

 latter appearing to be the more common form. The rate of 

 growth in all of these specimens is imperceptibly slower tban in 

 the type of the species, so that the last whorl is very slightly 

 narrower. One of the varieties is of the same uniform pale 

 greenish horn colour as the type ; the other (var. castanea) of a 

 rich brown tint, excepting the keel and suture, which are yellowish. 

 This ma)^ be Nanina janus (Chemn.), as identified by Dr. E. 

 von Martens (Preuss. Exped. Ost-Asien, Zool. vol. ii. p. 226, pi. xi. 

 fig. 4). The sculpture is precisely similar in all. 



This species approaches very closely to D. rerjalis in form and 

 sculpture, but it does not exhibit the plications at tlie upper part 

 of the spire which are characteristic of that species. D. irgaUx, 

 however, which is variable in colour, is usually rather smaller; 

 the basal portion of the latter around the umbilicus is of an 

 opaque creamy tint. A somewhat similar pale zone exists in the 

 type of D. lindstedti and is also faintly indicated in some of the 

 Penrisen shells. Probably the two species pass imperceptibly one 

 into the other. 



The shell figured is the type specimen described by Pfeiffer from 

 Malacca. 



9. DxAKiA BUSANENsis, Grodwin-Austen, var. 



DyaJcia busanensis, Gr.-A. Proc. Zool. Soc. 1891, p. 31. pi. ii. 

 fig. 1. 



Eab. Batang Lupar district, Sarawak. 



The specimens fi'om this locality differ from the typical form in 

 being of a uniforn horny browTi colour (var. concolor). The spire 

 may be a trifle less conical, but as regards the number of whorls 

 and the character of the sculpture they are practically identical. 

 The whorls are a trifle convex and distinctly impressed above the 



