74 ACHATTNA. S.-G. LEPTOCALA. 



Jousseaume's description and figure (pi. 34, fig. 15) are 

 given. The latter differs from von Martens' illustration of 

 pulclidln in the less obtuse summit, narrower columella and 

 in having a half- whorl more ; but the two agree exactly in 

 measurements. The discrepancy may be due to inaccurate 

 drawing by Jousseaume's artist. It is therefore doubtful 

 whether the Cameroon form is separable even as a variety; 

 d'Ailly uniting them. The original figure of A. pulchella 

 is copied in pi. 34, fig. 14. The original description follows: 



"Shell oblong-ovate, very minutely spirally lineate, other- 

 wise smooth, glossy; whitish, painted with close narrow wavy 

 stripes of orange. Spire conoid, the apex obtuse. Whorls 

 6 to Gi/o, a little convex, suture rather deep and simple. 

 Aperture somewhat oblique, occupying two-fifths to three- 

 fourths the length, sinuate-oval, acute above; peristoine thin, 

 unexpanded ; columella arcuate, orange tinted, obliquely trun- 

 cate. Length 32, diam. 15, aperture 8 mm. wide, 13.5 long. 

 Bonjongo, in the Kamerun mountains." (v. Mart.}. 



The names pulchella Martens, smithi Sowerby and soiuerbyi 

 Smith pertain to the Cameroon form, which if it proves dis- 

 tinguishable from that of the Congo, will be. called var. 

 soiucrbyi Smith. All of these are larger than Morelet's 

 A. mollicella. 



2. A. SPECULARIS Morelet. PL 2, figs. 15, 16. 



Shell ovate-elongate, very thin, nearly smooth, diaphanous, 

 whitish corneous, the base obscurely marked with reddish 

 streaks. Spire long-conic, the apex obtuse, suture impressed, 

 nearly simple. Whorls 8, slightly convex, the last a little 

 swollen, more than two-fifths the total length. Columella 

 lightly arcuate, abruptly truncate at the base. Aperture 

 semioval, the peristome thin, unexpanded. Length 27, diam. 

 12 mm. (Morel.). 



West Africa: banks of the Rio Moembege, district of 

 Cazengo, Angola (Welwitsch). 



Acini/tint K'pccularis MOREL., J. de C. 1866, p. 159; Voy. Wel- 

 witsch p. 74, pi. 4, f. 4. PFR. Monogr. vi, p. 219. 



A fragile, transparent shell, sometimes unicolored, some- 



