RUMINA. 211 



Found underneath granite boulders on hills above Adona, 

 altitude over 2000 feet (Balfour). 



S. hirsutus is the type and only species of the undefined 

 section Balfouria Crosse, 1884. 



Genus RUMINA Risso, 1826. 



Bumina Risso, Hist. Nat. Eur. Merid., iv, p. 79, for R. de- 

 collata L. Orbit ina Risso, t. c., p. 82 (young of R. decol- 

 lata). Cylindrina SCHLUETER, Syst. Verzeich., p. 7, 1838, for 

 C. decollata. Sira A. SCHMIDT, Der Geschlechtsapparat der 

 Stylommatophoreii in taxonomischer Hinsicht, in Abhandl. 

 naturwiss. Veredns fiir Sachsen u. Thiiringen in Halle, i, p. 

 42 (1855), type 8. decollata. Stenogyra of many authors. 



Shell perforate, cylindric or tapering, 4 to 7 whorls re- 

 maining in adults in which the summit is truncate and closed 

 by a spiral convex septum ; about 8 to 10 whorls having been 

 lost by successive breakages. Aperture subvertical, ovate, the 

 outer lip simple, obtuse; columella vertical, slightly concave, 

 continuous with the basal lip ; columellar margin reflexed. 

 Apex globular, smooth, fine striae appearing on the third 

 whorl ; young shells with concave lateral outlines. 



Genitalia (pi. 65, fig. 46, x 3). The penis is a rather slen- 

 der sack, with terminal retractor and vas deferens, the latter 

 imbedded in its integument. The vagina is longer than the 

 penis; duct of the spermatheca short. 



The pallial organs (pi. 65, fig. 44, x 3) resemble those of 

 Limicolaria and Achatina in the type of venation of the lung, 

 but differ in the much shorter kidney (fc), less than double 

 the length of the pericardium. The secondary or gut ureter 

 (s. u.) is closed. 



The right ocular and tentacular muscles are united prox- 

 imally with the columellar muscle. The pharyngeal retractor 

 unites with the left ocular band (pi. 65, fig. 45). The re- 

 tractor of the penis is a branch of the right ocular band. The 

 salivary glands are united around the oesophagus (pi. 65, figs. 

 43, 44, s. 01.)- 



The jaw is arcuate, with rather weak vertical striae. 



The radula (page ix, fig. 5) has a narrow tricuspid central 



