MOLLUSCA OF INDIA. 407 



circular, diagonal. Peristome thickened, double, external lip 

 expanded, inner continuous and projecting slightly at the base. 

 Operculum thin, horny, multispital, very concave externally and 

 convex within, wanting the central boss. 



" Maj. diam. 3|, min. 3 ; alt. 2 ; diam. ap. 1 mm. 



" Hah. The hills east of Mandalay and Ava, 



" This species approaches A. strangulatus, Hutt., which is larger 

 and more discoid." 



Altc^us bifeons, Theobald. (Plate CXXXIX. figs. 3, 3 a.) 



Theobald, J.A. S. B. xxxix. 1870, p. 396, pi. xviii. fig. 1; 

 id. Cat. Supp. p. 39, Upper Salween Valley ; Nevill, Hand-1. 1878, 

 p. 293, no. 33, 6 sp., Shan States ; Hanley & Theob. Conch. Ind. 

 p. 38, pi. xciii. figs. 1 , 4. 



Specimen figured No. 20. 1906.5.5, Elanford Coll., P.M. (Fedden). 



Original description : — " Testa perspective umbillcata, depresse 

 conoidea, tranducente, cornea, apice rubello ; spira elevatiuscula, 

 sutura impressa : anfractihus quatuor, rotundis, juxta stricticram 

 reyidariter et confertim striata costidatis, reliqua parte aliquando fere 

 Icevigatis, aliquando levissi^ne striatis. Strictura glabra, longa, fere 

 quartam partem ult. anfract-us cequante, duabus costis fortissimis 

 munita, qaarutn posterior paido robustior et anteriore longior est, 

 tubulo suturali tenuissimo, adpresso, quartam peripherice cequante ; 

 apertura av)pla, circulari sensim dejiecta ; perist. diiplici, albido, 

 lahio adnata ungustissimo, labro infra modice incurvato, 



" Diam. maj. 20, min. 15 ; alt. 10 unc. 



^^ Habitat. Shan States." 



Altc^us cucullatus, Theobald. (Plate CLV. fig. 5.) 



Theobald, J. A. S. B. xxxix. pt. 2, 1870, p. 396, pi. xviii. fig. 2; 

 Hanley & Theob. Conch. Ind. 1870, p. 39, pi. xcvi. figs. 1, 4; 

 Theobald, Cat. Supp. p. 39. 



Specimen figured No. 19. 1906.5.5, Blanford Coll., P.M. (Fedden). 



Original description : — " Testa umbilicata, depresse subdiscoidea, 

 rubente cornea, transversim striata, juxta suturani fortioribus sive 

 costulis Jiliformibus confertissime ornata, apice glabra, rufescente, 

 elevatiuscula ; anfraclibus quatuor, canvexis ; tubulo suturali modico, 

 quartam peripherice vix cequante; strictura brevi, Icevigata, striis 

 nonnullis costiformibus ad basin et casta crassa transversa notata. 

 Apertura parum abliqua, subrotundata, fere soluta, labro exterae 

 modice expanso, lamellose undulato, ad marginem pcndo incrassato, 

 5-inciso, lamella supera maxime producta ; labro simplici, paulo 

 arcuato, supra vix adnata ; operculo cornea, margine elevate 

 nucleoque centrali parum excavata. 



" Diam. maj. 21, diam. min, 20 ; alt. 21 unc. 



" Habitat. Shan States." 



This is a remarkably fine species with the crenulated lip of 

 A. plectocTieilus much exaggerated. 



PART XII. 2 K 



