ANTILLEAN LEPTINARIA. 291 



(June, 1849). Leptinaria valenzuela Jouss., Bull. Soc. Zool. 

 de France, xii, 1887, p. 170, pi. 3, f. 4. Achatina lamellosa 

 Moricand, REEVE, Conch. Icon., v, pi. 19, f. 107 (June, 1849). 



The form with widely -spaced, arcuate riblets on the spire 

 may perhaps be distinguished varietally from L. lamellata, 

 under the above name. It is chiefly South American, though 

 specimens with distant costellae may also be found among the 

 specimens from Barbados, Porto Rico, etc. 



Reeve's type (fig. 3) was from Bolivia. I figure a speci- 

 men, fig. 1, from Raiz do Serra, Sao Paulo, Brazil (v. Iher- 

 ing). Others are before me from Trinidad, Demerara, Suri- 

 nam, San Estevan, Pto. Cabello, Venezuela, Marmato Colom- 

 bia, etc. Most of these specimens are imperforate, but a 

 narrow perforation appears in some individuals. 



Long variety, pi. 46, figs. 2, 4. A series of ten from 

 Caracas consists of much lengthened shells with as many as 

 7y 2 whorls. There are inconspicuous, widely-spaced riblets 

 on the spire, and the parietal lamella is small or even wanting. 

 Three are imperforate, the others narrowly umbilicate or 

 rimate. 



The following are synonyms of concentrica. 



"Ackatina lamellosa. Shell acuminately ovate, whorls 6, 

 somewhat rounded, very finely concentrically plicately lamel- 

 lated, columella twisted, slightly truncated, furnished at the 

 upper part with a small ridge; transparent, horny. A very 

 transparent shell, most delicately concentrically lamellated. 

 Hab ?" (Reeve). 



Leptinaria valenzuela Jousseaume, from Coca, Ecuador, is 

 a synonym of concentrica. It is described as with widely 

 spaced, slightly projecting striae parallel to the lip-edge, and 

 a parietal lamella. It measures, length 10, diam. 4.5, aper- 

 ture 4x3 mm., with 6 whorls. M. Jousseaume does not com- 

 pare it with any of the described species. 



2. L. MONODON (. B. Adams). PI. 43, figs. 41, 42. 



"Shell ovate-conic; dingy white; with some slight striae of 

 growth; spire with the outlines somewhat convex; apex sub- 

 acute ; whorls nearly five and one-half, a little convex and 



