217 
115. Ampullär ia crassa var. monticola Vernhout. 
Taf. 76. Fig. 8. 9. 
Differt a typo testa minore, apertura breviore sed latiore. 
Long. 23, diam. 22,5, long. apert. 17,5, diam. 13 mm. 
! Ampullaria crassa Swains. var. monticola n. var., Vernhout, in: Notes from 
Leyden Museum vol. XXXVI. 1914 p. 47 t. 1 fig. 15. 
Hab. Mount Cottica in French Guyana. 
„The specimens seem to me to be fullgrown, owing to the thick callus on the 
inner lip, and the rather broadly reflexed columellar margin. The Shells are very 
much eroded at the apex. The colour is olivaceous brown ; the whorls are encircled 
by several wider and narrower blackish brown bands. The surface, which seems 
smooth to the naked eye, appears under a strong lens to be finely granulated.“ 
Vernhout. 
116. Ampullaria sowerbyi Vernhout. 
Taf. 76. Fig. 10. 
Shell imperforate, rather solid, ovoid, olivaceous with brownish bands, in some places 
darker coloured, encircling the whorls. Spire conic, whorls (in the single young specimen 
only 4 1 j i ) convex, sculptured by spiral striae, irregularly placed which are decussated by also 
irregulär grooves, thus giving origin to small knobs, varying in size and shape ; under a strong 
lens the larger knobs are seen to be finely striated longitudinally. Aperture ovate, straight. 
Columella oblique. — Vernhout. 
Long. 14, diam. 11 mm. 
Ampullaria sowerbyi Vernhout, in: Notes Leyden Museum vol. XXXVI p. 29 
t. 1 fig. 13. 
Lawa, Surinam. 
„A very small Shell, probably immature, but characterized by a remarkable 
sculpture, that will make it easily recognisable. Mr . Sowerby wrote to me it being 
quite diflerent from anything he knew. As very infortunately, is the case with 
many Shells collected by the Surinam-Expeditions, only a single specimen of this 
interesting species is found.“ 
J 
4 
ß 
I. 20. II. 
9. VH. 1914. 
28 
