412 land and freshwater 



Altc^tjs eubinus, G.-A. 



Moll. Ind. vol. ii. ]897, p. 3, pi. Ixiii. figs. 2, 2 a. 



Localitij. Ruby Mines District, Upper Burmah. No. 2685 B.M. 

 Type. 



Altc^ps sctjlptilis, Bs. (Plate CXXXIX. figs. 7, 7a; 

 Plate CLV. fig. 8, aperture.) 



Benson, A.M. N. H. ser. 3, xvii. (1856) p. 226; W. Blf. 

 A. M. N. H., June 1864, p. 458, type of sec. v. ; Theobald, Cat. Siipp. 



ii. p. 35 ; Beeve, Conch. Icon. 1877, A. microstoma. 

 Specimen figured No. 2648 G.-A. Coll., B.M. 



Original description: — "■Testa late umbilicata , tvrhinata, suhtrocM- 

 formi; acute costidata ; sjv'ra coiiica,svtura 2>rofunda, apice attenuato, 

 acutiusculo ; anfractihv.s 5 convexis, ultimo ad latusinjlato eo costulis 

 confertissimis munito, turn constricto, antice laivioH, tuniido, tubulo 

 suttirali ynediocri, ah apertura remote, incumbente, circa umbilicum 

 obtuse angidato, intns concavinsculo ; ap>ertura obliqua, circulari ; 

 jjeristomate duplici, interiori suhjwrrecto, incrassato, marginesuperne 

 profunde incise, interiore dextrali interne creniilato vel denticulate, 

 externa incrassato, expanso rejlexiusculo, superne incrassato pro- 

 minente, ah anfractu penidtimo sinu pjrofundo separate. Oper- 

 culo ? 



''Diam. 3^, axis 2| mill. 



'^'^ Bab. raro ad Thyet-Mio prope fluvium Irawadi, non procul a 

 finibus provinciae Biirmanicse Britannicae. 



"The specimen is much weathered, and has lost all its colour, 

 so that I am unable to describe that part of its characters. Jt 

 presents a new form in the genus, and exhibits a peculiar charac- 

 ter in the slit inside the aperture at its upper part, and in the 

 crenulation or denticulation along the callous interior of the right 

 lip. The teeth are twelve in number and are disposed in pairs. 

 The incision resembles that observable in some of tlie species of 

 Fterocijchs, and there is a slight disposition towards the formation 

 of a wing." 



The aperture of this species is unlike that of any other I am 

 acquainted with ; it is not well seen in the specimen shown on 

 Plate, CXXXIX — there is only just an indication of the small 

 crenulation on the outer and lower margin. I give an enlarged 

 sketch of the aperture of another specimen from Thayetmyo 

 (No. 70.06.4.4) in I)r. Blauford's collection, in which the almost 

 denticulate border is well developed, with a tendency to arrange- 

 ment in pairs. 



