Mascarene Land-Mollusca. 425 



forms — Pachystyla, Rotula, &c. being subgenera based mostly 

 upon shell-character alone. 



Erepta leucostyla, Pfr. (PI. IX. figs. A, A 1.) 

 = mauritiana, Pfr., = mauritianella, Morelet. 



Locality. Mauritius (E. Dupont). 



Animal. Grey throughout. Foot divided, the mucous pore 

 large, extremity of foot truncate. The peripodial grooves 

 present, but their parallelism is not very distinct, nor is the 

 margin of the foot fringed, it is plain and concolorous. 



Membrane of the branchial cavity finely mottled upon 

 the margins of the veins, defining them well. 



There are no shell-lobes; the right dorsal lobe is small, the 

 left dorsal lobe in two parts. 



Genitalia (rig. A). The shell being closely wound, the 

 different organs are much elongated. In the penis the epi- 

 phallus (ep.) (i. e. the portion between the retractor muscle 

 and vas deferens junction) is very long, and at this last 

 point a peculiarly long caecum calciferum or flagellum (Ji.) 

 is given off. There is no amatorial organ. The sperma- 

 theca (sp.) is extremely long, buried in the folds of the 

 ovo-testis (ov.), and extending close up to the albumen-gland. 



The jaw (fig. A 1) is moderately arched with a central 

 projection. 



The radula (fig. A 1) has the formula 



68 . 1 . 17 . 1 . 17 . 1 . 68 



86 . 1 . 86 



The outermost lateral teeth, up to the number of about 30, 

 are very minute, bicuspid, so are all the rest, the inner point 

 slightly the longest. The adinedian teeth and central tooth 

 are of the usual form seen in Macrochlamys &c. ; they are 

 rather short, not elongate, on rather broad basal plates. 

 The radula extracted was complete and had 118 rows. 



Erepta rufozonata, H. Adams. (PI. IX. fig. B.) 

 = ochroleuca, Ferussac. 



Locality. Mauritius (E. Dupont). 



The shell of this species is much smaller than the pre- 

 ceding, but very similar in its general form, and quite 

 distinct conchologically. The animal is dark grey, with two 

 narrow parallel white streaks on dorsal side of the neck and 



Ann. & Mag. N. Hist. Ser. 8. Vol. ii. oO 



