CLASSIFICATION OF OLEACINID^E. XV11 



short retractor muscle is seated on the epiphallus, which 

 minates in a long slender flagellum (pi. 34, fig. 4, fl). The 

 base of the spermathecal duct is globosely swollen (sp. d.). 

 This inflation may be homologous with the sack-like inflation 

 of the vagina in V. denticulata suturalis, described below. 



The buccal mass is small and short, and the radula very 

 small, about 2 mm. long in a shell 22 mm. long. 



Varicella denticulata suturalis Pils., from Sans Souci. 

 A specimen much hardened in strong alcohol was examined. 

 The foot is much shorter than usual in Oleacinida, shaped 

 more as in the Ackatinida. No labial processes could be 

 made out. The penis is long and simple. The vagina is 

 dilated into an ample sack, somewhat bilobed above, and 

 coarsely corrugated within. No other features could be dis- 

 tinguished (pi. 34, figs. 6, 7, lower portion of genitalia). 



The buccal mass is comparatively very small for an Olea- 

 cinoid snail, and quite short, the radula about 2 mm. long in 

 a shell 16 mm. long. This species belongs to a group prob- 

 ably separable from Varicella s. sir. as a section or subgenus, 

 comprising the Cuban, Haitian and Porto Rican species, 

 no. 58 to 70 of my account (pp. 113 to 123). 



The radula of Varicella is characterized by its very small 

 size and minute teeth, and the comparatively straight trans- 

 verse rows. In V. nemorensis and V. denticulata the radula 

 is somewhat over 2 mm. long. V. nemorensis has bow- 

 shaped transverse rows of teeth with 31,1,31 to 35,1,35 in 

 different parts of the radula (pi. 37, figs. 25, 26). The cen- 

 tral tooth is well developed, the laterals of the usual thorn- 

 shaped form. V. denticulata suturalis has over 72 rows of 

 43,1,43 teeth, the rows very broadly v-shaped, the sides meet- 

 ing at an angle of about 105 degrees (pi. 37, fig. 24). The 

 central tooth is narrow but distinct, the laterals thorn-shaped, 

 decreasing very gradually, and with many very small teeth at 

 the sides. V. semitarum has 30,1,30 teeth (p. 46, pi. 25, fig. 2). 

 V. mandevillensis has only 14,1,14 teeth (p. 50, pi. 25, fig. 1)-. 



OLEACINA. 

 The soft anatomy of the type species, 0. voluta, is un- 



