PLEKOCHEILUS-EURYTUS. 79 



whorl interrupted by irregular or zigzag light streaks. Sculpture, 

 a dense, fine malleation of the whole body-whorl, covered by a micros- 

 copic granulation, the granules tending toward arrangement along 

 striae in the direction of growth-lines (fig. 4) ; penultimate whorl 

 somewhat less malleated, not granulate ; first whorl with fine irreg- 

 ular oblique striae ; the whorls of spire plicate below sutures. Apex 

 planorboid, a pit at the tip. Whorls 3f, the earlier slightly convex, 

 latter 1 decidedly convex ; last half of body-whorl rapidly and 

 deeply descending. 



Aperture about three-fifths the total alt., ovate-pi riform, flesh- 

 colored inside, with a sub-margin of brown within the lip, peristome 

 expanded and narrowly reflexed, brown-tinted white, convex on the 

 face ; columella narrow, reflexed and adnate above, the inner edge 

 whitish, extending upward in a rather long, feebly convex fold ; 

 parietal wall smoky-brown, covered by an almost imperceptible, 

 transparent film. Alt. 31, greatest diameter 19, alt. of aperture 19 

 mill. 



Between La Plata and Tocaima, U. S. of Colombia (J. H. Gibbon, 

 M. D.). 



Bulimus glandiformis LEA, Trans. Amer. Philos. Soc. (n. s.), vi, 

 1836, p. 83, pi. 23, f. 92 (June 15, 1838) ; Obs. Gen. Unio, ii, p. 83, 

 pi. 23, f. 92. 



Description and figures from Lea's type, no. 105045 of the Smith- 

 sonian Institution collection. There is some superficial resemblance 

 to P. pulicarius, but that species has more whorls, a deeper suture 

 and rounder mouth, is variegated with dark brown, and it lacks the 

 conspicuous and characteristic malleation of glandiformis. The 

 superficial dents in this species are arranged in obliquely descending 

 series in some places, elsewhere are irregular; the mesh of wrinkles 

 around the indentations is mainly light yellow, where the thin, 

 glossy cuticle is retained ; but on the body-whorl there are some 

 oblique stripes of a darker chestnut, without buff net-work. P. sub- 

 glandiformis Mouss. is a longer shell than this, but is apparently 

 its nearest ally. 



P. MABILLEI Crosse. PI. 21, figs. 44, 45. 



Shell slightly subrimate, ovate, thin, longitudinally rugose, closely 

 granulate ; brown under a thin, partly deciduous, buff epidermis, 

 marked transversely with few and inconspicuous blackish spots. 

 Spire conic, the apex moderately obtuse ; whorls 4, slightly con- 



