1913.] NATURAL SCIENCES OF PHILADELPHIA 647 



Rocha. They are slightly shorter than typical Cuban siDecimens 

 and the whorls are a little more convex. 



Genus STROBILOPS Pilsbry. 

 Strobilops brasiliana n. sp. PI. XXI, figs. 8, 9. 



Shell rather narrowly perforate, broadly conic with slightly convex 

 outlines, subcarinate at the periphery, and with a moderately rounded 

 base; color light chestnut, a thin, close epidermis present; apex 

 obtuse; first 1| whorls nearly smooth, and, beginning on the second 

 whorl, everywhere sculptured with irregularly spaced, narrow, 

 sharp, strongly retractive costae, much weakened on the base, but 

 extending into the umbilicus, separated by broad, nearlj^ flat inter- 

 spaces marked by gro^vth lines, the costae being rather close on the 

 third whorl and wddely separated on the last (about six to the 

 millimeter on the penultimate whorl). Whorls 5|, moderately con- 

 vex; sutures well impressed. Aperture irregularly triangular; 

 peristome thickened and slightly reflected, extremities not approach- 

 ing and joined by a heavy callus, which is sharply defined externally 

 and dips deeply into the mouth, over which are laid two revolving 

 lamellae which reach the exterior edge of the callus, one very large 

 just exterior to the middle of the parietal wall and a second of less 

 than half the size half way between this and the columella; columella 

 marked near the top by a third quite prominent revolving lamella, 

 leaving a very narrow slit between it and the parietal wall; base 

 showing externally two revolving lines, probably representing internal 

 basal revolving laminae. 



Alt. 2.22, greatest diam. 2.61, least diam. 2.4 mm. 



Eight living specimens, all apparently mature, were taken under 

 the bark of a decaying tree in the dense forest surrounding water 

 works of the city of Para. 



The species is the first representative of this genus to be taken 

 south of the Amazon River, so far as is known to the Avriter. 



SUCOINEID^. 



Genus SUCCINEA Draparnaud. 

 Suocinea pusilla Pfeiffer. 



Mon. Hel. Viv., Ill, p. 18; Conchyl. Cabinet, Succinea,. pi. .5, figs. 27-29. 

 Two dead specimens, one taken at Baixa Verde, a second from 

 Ceara sent by Mr. Rocha, agree in the main with this species as 

 described by Pfeiffer with some doubt as from Ceara. They are 

 somewhat larger and do not show the obsolete decussation mentioned 

 by him, but this may be due to their being worn. 



