AMPHIDROMUS, S.-G. BEDDOMEA. 



p. 3642 DILLWYN, Descr. Catal. ii, p. 933. Bulimus trifasciiitus 

 BRUG. Encycl. Mth., p. 317. DESK, 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. H. (2), xi, p. 226 (1853). Amphidro- 

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

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

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

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

 domed] 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 (Cochhgena) trizonaHs FER., Prodr., no. 417 Bulimus 



zonatus SWAINSON, Zool. Illustr. 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 Haul. 

 & 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 two 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. 0. Collett at Uda Pussellawa (pi. 1, fig. 6), 



