422 LAKD AND FEESHWATER 



interno expnnso, rrtrorelicfo, in processum auriformem suhtus producto. 

 Operc. teniie corneum midtisjnruin. 



" Diam. major '-^k, minor 3, alt. 2g, ap. diara. 1 mm. 



" Hah. prope Tongoop iu Arakaii. 



" This very pretty and distinct little species occurred rarely at 

 the roots of trees near Thaloo and Bandij^o, on the Prome and 

 Tongoop road, not far from the last-named place. It combines the 

 canaliculate inner peristome of A. succineus, with an ear-shaped 

 process like that at the base of A. poli/r/oiioma ; while the ridge on 

 the peristome is curved backwards in a similar manner to that in 

 A. hehes, Bens., A. (jemmula, Bens., and A.footei, Blanf., although 

 much less elevated than in either of those species, to which the 

 shell now described has otherwise but little resemblance. The 

 somewhat flattened base is peculiar. 



" The preceding species show how numerous must be the forms 

 belonging to this peculiar and Avell-marked little genus. Ten 

 species, including ^6)»6o?^ff?^s, arm'dlatus, and sculptilis of Mr. Benson, 

 have now been described from the partially explored provinces of 

 Pegu and Arakan." In footnote : — " Since the above was written 

 I have obtained two more species from U])per Burma." 



The specimen I have figured is one of three in the Blanford Col- 

 lection from Manya Khyoung, Arakan. 



Altc.eus politus, "W. Blanford. (Plate CXXXIX. figs. 5, 5 a.) 



Typical si)ecimen figured, Blf. Coll. 178.06.4.4 B.M. 



W. T. Blanford, J. A. S. B. 1865, xxxiv. pt. 2, p. 83 ; Hanley 

 & Theobald, Conch. Ind. 1870, p. 39, pi. xciv. figs. 1, 2, ;5 ; 

 Theobald, Cat. Supp. 1876, p. 40. 



Oriqinal description : — " Shell moderately umbilicated, tur])i- 

 natelv depressed, smooth, polished, shining, amber-coloured. Spire 

 depressly conoidal, suture deep ; apex obtuse, rather redder than 

 the remainder of the shell. Whorls 3|, convex, the last round, 

 scarcely descending towards the mouth, very little swollen at the 

 side, and ornamented on the inflated portion for a short distance 

 with close fine costulation, which extends beneath to the umbilicus 

 and renders the shell opaque in that spot. Constriction long, 

 smooth, swelling considerably in front towards the mouth. Sutural 

 tube short, about i to Jr of the periphery of the penultimate whorl. 

 Aperture oblique, circular, deeply sinuate at the junction with the 

 penultimate whorl and at the lower right margin ; peristome double, 

 the inner lip projecting and continuous, outer lip retrorelict. 

 Operculum horny, multispiral, externally concave. 



" Major diameter 3, minor do. 2|, axis 1^ mm. 



" Habitat. Phoungdo, near Cape Xegrais, Arakan. 



" Very near A. humilis, W. Blf., from Pegu, but distinguished by 

 its lower spire, wider umbilicus, more sinuous mouth, and especially 

 by its high polish, in which it is only equalled by A. nitidus, 

 W. Blf." 



