DliVMjEUS. 



Section Stenosty/us Pilsbry, 1898. Peru to Colombia. 

 D. kocbi Pfr., xi, 314. D. meleagris Pfr., xi, 315. 



D. guttula Pfr., xi, 314. D. colrneiroi Hid., xi, 31 f>. 



D. goudoti Pet., xi, 314. D. tapadoides Pli., xi, 317. 



D. troscheli Phil., xi, 314. I), ignobilis Pli., xi, 317. 



D. nigrolimbatus Pfr., xi, 315. 



Submenus LEIOSTKAOUS Alb., 1850. 

 ALBERS, Die Hel., 1850, p. 15G. PII.SBRY, Manual xii, p. 90. 



Perforate, ovate pyramidal shells willi the brilliant and usually 

 banded or streaked surface of Drymseits ; but the nepionic shell has 

 extremely minute spiral stria? and occasionally some slight vertical 

 wrinkles. 



The jaw (of D, perlucidus} is like that of Drymaus. The radula 

 (pi. 58, fig. 78) has brace-shaped ( ^-^-y^-- ) transverse rows running 

 forward from middle to margins, and with comparatively few teeth in 

 a row, the formula of D. perlucidus being 19.9.1.9.19. The centrals 

 have a single rather wide cusp shorter than the basal-plate. The 

 laterals have a very broad, rounded main cusp and a well developed 

 ectocone. The main cusp becomes emarginate on the marginals, and 

 finally bifid, and the ectocone also splits (pi. 58, fig. 76, D. perlucidus.) 

 The mantle is green in this species. 



Leiostracus differs widely from Urym&us in its diverse, probably 

 degenerate, apical sculpture, in the reduced number of teeth, and the 

 entire, rounded cusps of the laterals. In all true Drymseus the lateral 

 teeth are tricuspid. These differences will probably make it advis- 

 able to raise the group to generic rank; but until the radula of the 

 type species, D. vittatus, is examined, 1 prefer to treat it as a sub- 

 genus of Drymoeus ; the natural position of Leiostracus being between 

 DrymtjEUS and Zaplagius. The species are all Brazilian. 

 D. vittatus Spix, xii, 91. D. vimineus Moric., xii, 95. 



H. coxeirana Moric. D. manoeli Moric., xii, 96. 



H. caxoe.irana Moric. coxiranus P. & M. 



B. candidus Gray. D. cinnamomeolineatus Moric., xii, 



B. omphalodes Mke. 97. 



D. obliquus Rve., xii, 93; xiv, 1G3. D. perlucidus Spix, xii, 98. 



jeffreysi Pfr. opalinus Sowb. 



D. clouei Pfr., xii, 94. H. angulosa Per. 



D. onager Bk., xii, 94. 



zebra Spix. 



v. subtuszonata Pils., xii, 95. 



