217 



115. Ampullaria crassa var. monticola Vernhoul. 



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 Prench Guyana. 



„The specimens seem to me to be fuUgrown, 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. Thecolouris 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 pla*ces 

 darker coloured, encircling the whorls. Spire conic, whorls (in the Single young specimen 

 only 4^4) convex, sculptured by spii-al 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 different from anything he knew. As very infortunately, is the case with 

 many Shells coUected by the Surinam-Expeditions, only a single specimen of this 

 interesting species is found." 



I. 20. II. 9. VII. 1914. 28 



