1895.] BOETEO AND NEIGHBOURING TSL VNDS. 117 



Although the difEerences between the extreme forms of this 

 species are considerable, still there is such a general resemblance 

 throughout the series, that it seems advisable to consider the 

 various forms as local races of one and the same species rather than 

 to describe them as distinct. The variation in the tongue-like 

 reflection of the peristome over the umbilicus is one of degree, 

 passing from tlie typical form, where it is obvious, to the var. 

 pyfimcva, where it is almost imperceptible. 



50. Altc.i:us hosei, Godwin-Austen. 



Alifcreushosei, G.-A. Proc. Zool. Soc. 1889, p. 347, pi. xxxvii. f. 2. 



Hah. Busau and Eumbang Hills, Sarawak (Everett). 



In the description of this species the apex of the spire is said 

 to be " pointed." In both the figure, however, and the shells also, 

 it certainly is blunt. It is distinguished from A. dohrm thus : 

 " apex distincte obtusior ; tubulus suturalis aperturae magis approxi- 

 matus ; apertura suhverticalis, non diagonalis ; peristoma utrinque 

 distincte auriculatum, margine columellari cum basali angulum 

 efficiente perdistinctum etc." (Dr. O. Boettger in litt.). 



51. ALYCiEUS (OETHVLVdirs) CONGENER. (Plate III. fig. 26.) 



Testa A. hosei similis, sed minor, spira elatiore, graciliore, anfractii 

 ultimo minus gihhoso, peristomate expaiiso, duplice, margine 

 columellari rejlexo, ad umhilicum sinuato, hand oblique recti- 

 lineare, 

 Diam. maj. 5|- millim., alt. 6. 

 Hah. Mulu and Barit Mountains, Sarawak. 

 In colour and general appearance this species looks very like 

 A, hosei. It differs, however, in the above particulars. It also, 

 in some specimens, exhibits traces of spiral strise. In hosei the 

 inner peristome is somewhat porrected, in this form it is more 

 reflexed. The sinuation at the umbiUcus is very peculiar. 



52. Altc-EFS (ORTHALTCiEus) SADONGENSis. (Plate III. fig. 27.) 



Testa A. fultoni similis, sed paulo minor, grisea, umhilico latiore, 

 anfractihus qtiinq^ie, oblique costulato-striatis et spiraliter tenu- 

 issime striatis, idfimo minus gibboso, perisiomate expanso, tenui, 

 haud duplice. 

 Diam. maj. 5^ millim., cdt. 5^. 

 Hah. Sadong, Sarawak (Everett). 



Although not mentioned by Dr. MoellendorfE in the foDowing 

 description, excessively minute spiral striae exist in A. fultoni ; they 

 are visible only under the microscope, and are less observable than 

 in the present species. The spire of the latter is slightly less 

 elevated and the whorls more rounded than in A. fidtoni. 



53. Alyc^us (ORTHALTCiETTs) FULTONI, MUdff. (Plate III. 

 fig. 28.) 



" T. perforata, elate turbinata, sat tenuis, subpellucida, confertim 

 costidato-striata, Icete citrina ; spira valde ele>'ata, s^ihregulariter 



