DRYMJEUS, WEST INDIES. 19 



D. IMPERFECTUS (Guppy). PI. 12, figs. 1, 2, 14. 



Shell narrowly perforate, oblong conic, thin; milk-white, translu- 

 cent below the periphery a*nd on the spire, with five chestnut bands, 

 the second (from above) usually narrowest, the fourth widest, apical 

 two whorls red-brown. Surface very glossy, under a strong lens 

 showing delicate growth-lines and minute engraved spiral strias. 

 Spire straightly conic, the apex rather obtuse. Whorls 5^, nearly 

 flat, the earlier 1^ convex, witli typical Drymceus sculpture, the last 

 whorl perceptibly angular at the periphery in front. 



Aperture less than half the shell's length, oblique, ovate ; outer lip 

 thin, unexpanded, white-edged, the bands not continued quite to the 

 edge; columella slightly concave, triangularly reflexed above. 



Alt. 15, diam. 7^, length of aperture 7 mill. 



Alt. 14, diam. 7, length of aperture 6^ mill. 



Southern part of Trinidad (Guppy). 



Bidimus multifasciatus var. irnperfectus GUPPY, Ann. Mag. N. H. 

 (3), xvii, 1866, p. 49 ; BLAND, Amer. Jour, of Conch, iv, 1868, p. 



184 B. aureolus var. irnperfectus GUPPY, Amer. Jour, of Conch. 



vi, p. 308; Jour, of Conch, vii, 1893, p. 219. Bidimidus (Drymceus) 

 trinitarius E. A. SMITH, Jour, of Conch, viii, p. 242, pi. 8, f. 7, 7a 

 (1896). ? Bidimidus aureolas var. fasciatus GUPPY, Amer. Journ. 

 Conch, vi, p. 184. 



With the band pattern of D. vincentinus, this shell is smaller and 

 has an aperture and lip of very different form. Description and fig- 

 ure 14 are from specimens received from Mr. Guppy. The series 

 of seven before me shows but slight variations. 



Mr. E. A. Smith has described the same species as B. trinitarius 

 (figs. 1, 2), apparently overlooking Mr. Guppy's good diagnosis of 

 imperfectus published thirty years previously. His specimens are a 

 little larger than those before me, alt. 19, diam. 9, length of aperture 

 9 mill., with 6 whorls, and the lip is described as somewhat expanded 

 in front. 



It is allied to D. rufolineatus Drouet, but differs somewhat in form 

 and banding. 



D. AUREOLUS (Guppy). PI. 12, fig. 3. 



Shell subperforate, ovate-conic, rather acuminate, thin, yellow, 

 shining, translucid ; finely striated by minute and close longitudinal 

 lines of growth, crossed by finer decussating stria?. Whorls 5 to 6, 



