216 SIMPULOPSIS. 



impossible to reconcile Sowerby's figures with these shells. More- 

 over, Sowerby described his species too briefly, and simultaneously 

 proposed two specific names for it. 



Moricand had been incorrectly informed by Ferussac that Sowerby 

 had named this species " brasiliensts," and therefore attributed the 

 name to that author. 



S. OBTUSA (Sowerby). PI. 64, figs. 86, 87. 



Shell ovate, corneous, longitudinally striated; spire very short; 

 whorls 3, a little convex ; aperture ovate, oblique. Length to the 

 breadth as 2 to 3 (Sowerby). Brazil. 



Succinea ovata SOWERBY, Genera of Shells, pt. ix, second page of 

 text, Succinea. 



Succinea obtusa SOWERBY, Genera of Shells, legend at foot of plate 

 of Succinea (1820 or 1822 ; see Ann. Mag. N. H. (6), xiii, p. 371). 

 REEVE, Conch. Syst., ii, p. 89, pi. 180, f. 2 (reprinted from 

 Sowerby's plate) Helix obtusa FER., Hist., pi. 9 B, f. 5 (copy of 

 Sowerby's figure). Simpulopsis obtusa BECK, Index, p. 100. 



According to Sowerby's figures, which there is no reason to think 

 incorrect, this species has a decidedly more projecting spire than S. 

 brasiliensis, and the outer lip is inserted much lower on the penul- 

 timate whorl. 



Sowerby called this species " S. ovata " in the text, " S. obtusa" 

 on the plate. Pfeiffer has chosen to retain the latter, ignoring the 

 former name. As I can add nothing to our knowledge of the species, 

 it is not worth while to question the propriety of Pfeiffer's favoritism 

 in dealing with the twins. 



S. RUFOVIRENS (Moricand). PL 64, figs. 88, 89, 90, 91, 



Shell semi-globose, very thin, olive-green or brown-tinted olive ; 

 somewhat shining but not glossy. Surface closely and strongly cor- 

 rugated, the corrugation rather regular, though sometimes folds split 

 or are intercalated. Spire conic. Whorls 3^, moderately convex, 

 the last globose; suture slowly descending in front. Aperture 

 rounded-ovate, very oblique, the outer lip thin, its upper end inserted 

 at or near the periphery of the penultimate whorl; colurnellar lip 

 very thin and regularly arcuate. 



Alt. 14, diam. 14, longest axis of aperture 12.4, width 9.5 mill. 



Province of Bahia, Brazil (Blanchet, Anthony). 



