SIMPULOPSIS PLATYSUCCINEA. 223 



Tliis species is larger than S. progaslor, which is evidently closely 

 allied. It is much more ventricose than S. citrinovitrea, of different 

 color, has a whorl less, and, on close inspection, is seen to be belted 

 by an angle at the periphery. This is not conspicuous, but is con- 

 stant in the series before me. 



S. PKOGASTOR (Orbigny). PI. 64, figs. 1, 2, 3. 



Shell globose, about as high as wide, thin, transparent; amber 

 tinted, slightly brownish, and uniform ; smooth, or with merely some 

 traces of growth-lines near the suture. Spire elevated, conic, the 

 apex obtuse ; formed of 4 whorls, separated by a quite deep suture. 

 Aperture about as wide as high, oblique, the peristome thin and 

 sharp. Length 7 mill. (Orb.). 



" Province des Mines " Brazil (Fontaine). 



Helix progastor D'ORB., Synops., in Mag. de Zoo'l., 1835, p. 2 : 

 Voy. dans 1'Amer. Meri.d., Moll., p. 255, pi. 22, f. 12-15 Vitrina 

 progastor PFII., Monogr. iii, p. 74. Succinea progastor BECK, Index 

 Moll., p. 99. PFR., Monogr. ii, p. 527 Simpulopsis progastor PFR., 

 Monogr. v, p. 23. 



Evidently allied to S. boissieri, but much smaller, with about the 

 same number of whorls. I have not seen specimens. 



S. LIMPIDA (Drouet). PI. 63, figs. 69, 70. 



Shell imperforate, ovate-ventricose, very thin and very fragile, 

 pellucid, striated, shining, transparent-yellowish. Whorls 5, convex, 

 the last large, swollen. Aperture ample, ovate-pear-shaped ; peri- 

 stome simple, unexpanded, acute. Alt. 13, diam. 8, length of aper- 

 ture 8, width 5 mill. (Drouet.) 



Jlet-la-Mere, French Guiana, on leaves (Eyries). 



Bulimus limpidus DROUET, Moll. Terr, et d' eau douce de la Guyane 

 Fran9aise, p. 64, pi. 2, f. 23, 24 (1859). PFR., Monogr. vi, p. 108. 



" In its pellucid texture and coloration, this pretty and very fragile 

 shell approaches certain Vitrinas." The species is known to me by 

 Drouet's account only. It seems to be either a Simpulopsis or a 

 Dry mams, some forms of the latter genus, such as D. dominicus, being 

 equally fragile and transparent. 



Subgenus PLATYSUCCINEA Ancey, 1881. 



Platysuccinea ANCEY, Le Naturaliste iii, 1881, p. 484. Type S. 

 portoricensis. 



