NON-MARINE MOLLUSCS OF SURINAM. 29 
The smaller specimen has the granulation of the surface 
coarser than the larger one. 
* 71. AMPULLARIA CASTELLOI Sow. 
Ampullaria castelloi, Sowerby, Proc. Mal. Soc. I, 1894, p. 48, 
Pl. 4, f. 22. 
Lawa. Gonini-Expeditie. 
A small, much eroded specimen, with the surface very 
finely granulated. 
* 72. AMPULLARIA CRASSA Swains. 
Ampullaria crassa, Swainson, Zool. [llustr., ser. I, Vol. III, 
1822-33, Pl. 101. 
Reeve, Conch. Icon., Ampullaria, spec. 5. 
Sowerby, Proc. Mal. Soc. VIII, 1909, p. 347. 
Lawa. Gonini-Expeditie. 
The specimens are not fully developed. The surface of 
the last whorl is sculptured with a fine granulation. Some 
of the youngest specimens are still partly covered by a 
brownish epidermis, showing spiral folds. All specimens, 
the youngest included, have the apex eroded. 
* 73. AMPULLARIA SOWERBYI nov. sp. (fig. 13). 
Shell imperforate, rather solid, ovoid, olivaceous with 
brownish bands, in some places darker coloured, encircling 
the whorls. Spire conic, whorls (iu the single young spe- 
cimen only 4'/,) convex, sculptured by spiral striae, irre- 
gularly placed, which are decussated by also irregular 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. 
Length 14, diam. 11 m.M. 
Type in the Leyden Museum. 
Lawa. Gonini-Expeditie. 
A very small shell, probably immature, but characte- 
rized by a remarkable sculpture, that will make it easily 
Notes from the Leyden Museum, Vol. XXXVI. 
