4 AMPHIDROMUS, S.-G. BEDDOMEA. 



p. 3642 DILLAVYN, Descr. Catal. ii, p'. 933. Bidimus trifasciatus 

 BRUG. Encycl. Me"ih., p. 317. DESII. in Lam., An. s. Vert, viii, p. 

 261. PFR., Monogr. ii, 58; iii, 323; iv, 382; vi, 28; viii, 43; 

 Conchyl. Cab., p. 50, pi. 41. f. 16, 17 REEVE, Conch. Icon., pi. 



39, fig. 237 HANLEY & THEOBALD, Conch. Indica, pi. 21, f. 3. 



LAYARD, Ann. and Mag. N. Ii. (2), xi, p. 226 (1853). Amphidro- 

 mus trifasciatus Jouss., Me"m. Soc. Zool. France, vii, 1894, p. 295. 

 Buliminus (Cerastus) trifasciatus Brng., Nevill, Hand List Moll. 

 Ind. Mus. i, p. 132. Buliminus (Beddomea) trifasciatus, Chemnitz, 

 KOBELT, Conchyl. Cab., p. 677, pi. 102, f. 22. Amphidromus (Bed- 

 dotnea') ceylanicus (Pfr-), PILSBRY, Proc. Malac. Soc. Lond. iv, p. 

 159 (anatomy), pi. 16, f. 3 (jaw), of specimen figured on pi. 1, fig. 

 8 Helix (Coc/Jogena) trizonaUs FER., Prodr., no. 417. Bulimus 

 zonatus SWAINSON, Zool. lllustr. i, pi. 17 (1820). Bulimus fusco- 

 ventris BENSON, Ann. and Mag. N. H. (2), xviii, p. 96. PFR., 

 Monogr. iv, 404; vi, 51. (= young trifasciatus according to Hani. 

 & Theob., Conch. Ind., p. 11, from examination of the type) B. 

 ceylanicus HANLEY & THEOBALD, Conch. Indica, p. 11, pi. 21, f. 2 ; 

 p. 59, pi. 148, f. 9. 



Bulimus rufopictus BENS., Ann. and Mag. N. H. (2) xviii, p. 96. 

 PFR., Monogr. iv, 404. HANL. & THEOB. Conch. Ind., p. 11, pi. 

 21, f. 10 Buliminus (Beddomea) rufopictus Bens., KOBELT, Con- 

 chyl. Cab., p. 670, pi. 102, f. 11. Amphidromus rufopictus Jouss- 

 EAUME, Mem. Soc. Zool. France vii, 1894, p. 295. 



A. trifasciatus varies notably both in form and coloring, the wide 

 specimens, like fig. 1, being typical. Narrow shells with the aperture 

 smaller and a light peripheral girdle between two wide brown bands 

 are more abundant. It varies to forms like fig. 3 of the Conchologia 

 Indica, and others (pi. 1, fig. 2) before me from Matella, etc., having 

 the spire more or less maculate, and sometimes with a subsutural 

 brown line, leading to var. rufopictus. In another series, by loss of 

 spiral bands a streaked form (fig. 8) is produced, such as that taken 

 by Mr. Collett at Columbo, or a nearly uniform color. At Tamanka 

 Layard collected specimens varying from cream-white, with only the 

 faintest traces of streaks, to white with t\vo heavy chestnut bands 

 below and a faint line below the suture (pi. 1, fig. 5). A somewhat 

 similar shell, but with the peristome purplish, is figured by Hanley 

 and Theobald as a variety of ceylanicus, locality not given. Speci- 

 mens collected by Mr. O. Collett at Uda Pussellawa (pi. 1, fig. 6), 



