202 CYCLOSTOMID^E. 



Lam. Anim. s. Vert. (ed. Desh) vol. viii. p. 3(50. — HA^,•r^f. 

 in Sturm Deutsch. Fauna, pt. 7, pi. 3. — Kickx, Moll. Brabant, 

 p. 69. — RossMASsL. Iconog. Land und Siissw. Moll. pt. 1, 

 p. 90, f. 44 ; pi. 5, f. 81, animal.— Philippi, Moll. Sicil. vol. i. 

 p. 143; vol. ii. p. 119. — Gras, Moll. Ter. et Fluv. France, 

 p. 55, pi. 4, f. 25. — Meumet, Moll. Pyren. p. 72. — Dupuv, 

 Moll. Gers, p. 63. — Sowerby, Thesaur. Conch, vol. i. p. 101, 

 pi. 23, f. 32, 33. — KiJsTER, Conch. Cab. vol. i. sec. 19, pi. a, 

 f. 1 to 3 (animal). 



Shell ovate-conic to oblong-conic, tolerably strong, not 

 polished, only a little transparent, pale purplish or livid 

 grey, mottled with purplish brown or pale violet liver 

 colour, sometimes in cloudy longitudinal waves, sometimes 

 in the form of two, or more frequently three, spiral bands of 

 irregular angulated spotlike markings ; top whorls usually 

 wholly livid, brown, or purplish. Surface densely encir- 

 cled by blunt costellar striae, that are about as broad as 

 their intervals, and are very nearly of the same size 

 throughout each volution ; decussated, likewise, by still 

 more closely set minute lamellar stria?, that are chiefly 

 perceptible in the spiral interstices. Whorls about five, 

 tumid, simply rounded, of moderate longitudinal increase, 

 divided by a simple suture, which is not crenated beneath; 

 apex blunt, not particularly small. Body about as long 

 as the spire ; its basal declination abruptly rounded. 

 Mouth filling about three-sevenths of the ventral length, 

 almost orbicular, but with a very obtuse angle above, 

 where the otherwise free peritreme is attached to the 

 body ; throat smooth, reddish fixwn colour ; peritreme 

 whitish or yellowish white, rather advancing anteriorly, 

 not thickened ; outer lip simple, acute, a little disposed to 

 expand ; pillar lip a little turned back, the space behind it 

 not differing either in sculpture, convexity, or markings 

 from the rest of the surface. Umbilicus neither larse nor 

 profound. Operculum spiral, solid, pale horn-coloured, 



