342 LAND AND FUESEWATER 



"A well marked form, reminding one of A. expairiafus ; the 

 depressed form, very open nmbilicus, and scarcely distinguishable 

 constriction, all good characters." 



The sculpture and coloration is very similar to that of A. straa- 

 f/alatus. 



ALTCJ3US PHTsis, lis. (Plate CXXXIV. figs. 1,1a.) 



A. M. X. H. ser. 3, vol. iii. 1859, p. 179; Pfr. Mon. Pneum. 

 vol. iii. p. 48 ; Hauley, Conch. Ind. p. 38, pi. xcii. figs, 5-6 ; Theob. 

 8upp. Cat. p. 40 ; Nevill, Hand-list, p. 294, Xo. 53. 



Original description : — " Testa mediocriter umhilicata, conoideo- 

 depressa, tenui, regidariter i^lanato- striata, striis opacis, minime 

 elevatis, confei'tissimis, ad umbUiciim perspectlvum nonmdlis elevatis 

 acutis, hi/alina, nitida ; spira brevl, apice suhpapillari, sutura im- 

 pressa ; anfractibns 4 suhconvexis, idthno ad latus, pone constricti- 

 onem, valde injlato, tubuJum siUuralem eloitgatum gerente, pone 

 labrum tumidiusculo ; apertura obliqua, suheirculari, p>eyistomale 

 daplici, interno breviter expanso, incrassato-rejlexo, externum celanie, 

 marginibus callo parietali expansiuscxdo semicirculari juaciis. 



" Operc. ? 



" Uiam. major 10, minor 8 ; axis 6 ram. 



"Habitat in valle Itungit (alt. 2000 ped.) prope Darjiling, I'are 

 occurrens. 



" Larger than the Khasia A. prosectus, from which it is abund- 

 antly distinguished, by the characters of the aperture, the less 

 mucronate spire, its peculiar striation- and lustre, shorter sutural 

 tube, and the greater inflation of the whorl. In prosectus the 

 space between the constriction and the aperture is suddenly tumid 

 near the constriction, the swelling decreasing towards the peristome; 

 in Physis the swelling increases gradually towards the mouth, which 

 is not inclined to be so very oblique. There are faint indications 

 of spiral sculpture evident in the facet-like appearance of the 

 surface. Within the umbilicus, near the inflated part, every fourth 

 or fifth of the scarcely elevated stria3 (which would elsewliere be 

 hardly distinguishable except for their white opacity on the hyaline 

 ground) is raised into a knife-like edge. 



" In size and form A. p)liyus nearly approaches iimbonalis : but 

 the colour, opaqueness, great solidity, and the more moderate 

 inflation of the last whorl, in addition to the more remote con- 

 striction, and the very different sculpture presented by the Burmese 

 species, preclude any danger of confounding it with its Himalayan 



ally." 



The specimen figured came from Western Bhutan (Xo. 2773, 

 B.M. Coll.) ; it measures : major diameter 9-75 ; alt. 3-5 mm. 



Altcj^us plectocheilus, Bs. (Plate CXXXIV. figs. 4-4 c.) 



A. M. N. H. ser. 3, vol. iii. 1859, p. 180 ; Pfr. Mon. Pneum. 

 vol. iii. p. 53 ; Hanley, Conch. Ind. p. 39, pi. xcvi. figs. 5 & 6, 

 too small ; Theob. Supp. Cat. p. 40 ; Xevill, Hand-list, No. 52, 

 p. 294. 



