Mascarene Land-Mollusca. 435 



Animal (PI. X. fig. 3 b) ovoviviparous ; one shell con- 

 tained three immature ones. Sole of foot narrow elongate, 

 with a peripodial margin, probably a mucous gland. It is 

 somewhat similar in its form to L. insularis, but I failed to 

 see the mucous gland ; it no doubt possesses that organ, the 

 radula and eye-tentacles being of similar type. 



The radula (fig. 3 c) has the formula 25 . 8 . 1 . 8 . 25, or 

 33 . 1 . 33, 



The central tooth and admedians are similar on broad 

 plates, with a long central point rising well above basal 

 cusps on either side ; the transition-teeth have one outside 

 cusp, and the laterals are curved and tricuspid. The jaw 

 (fig. 3 c) is high, rounded above, and with a central projection 

 on the cutting-edge, which is slightly concave. 



Raliella fourneauxensis, sp. n. (PI. X. figs. 4, 4 a.) 



Locality. Island of Fourneaux, S.W. of Mauritius (Duponi), 

 15.V.07. 



Shell (fig. 4) pyramidal, very narrowly perforate ; sculp- 

 ture irregular transverse striation, finer and more regular on 

 the apical whorls ; colour pale ashy ; spire nearly as high as 

 diameter of base ; suture shallow, marked by a fine lirate 

 line ; whorls (3, slightly convex, the last carinate and lirate ; 

 aperture semicircular ; peristome thin, columellar margin 

 slightly reflected. 



Size : major diam. 3'25, alt. axis 30 mm. Largest 

 example. 



The formula of radula (fig. 4 a) is 25 . 7 . 1 . 7 . 25, or 

 32 . 1 . 32. The central and admedian teeth are alike, on 

 broad plates, tricuspid, basal cusps on both sides of the main 

 point ; the marginal teeth also tricuspid, but more evenly so. 



EXPLANATION OF THE PLATES. 

 Plate IX. 



Fig. A. Erepta hucostyla, genitalia, part of, X 2-25. 



Fig. A 1. Ditto, jaw, X 9-25, and teeth of the radula, X 277. 



Fig. B. Erepta rufozonuta, part of genitalia, X 2-25. 



Fig. C. Erepta {Ccelatura) rufa, part of genitalia, X 2 - 2o. 



Eiys. D, D. Erepta (Ccelatura) ccelatura, part of genitalia, X 2*25. 



(The male organ in upper figure is shown detached.) 

 Fig. E. Erepta {Dupontia) lew's, sp. n., shell, X 34. 



Fig. E 1. Ditto, extremity of loot, with mantle-edge and part of the 



visceral sac, X 6. 

 Fig. E 2. Ditto, right and left dorsal lobes, X 6. 

 Fig. E3. Ditto, genitalia, part of, x 6\ 

 Fig. E4. Dittojaw, X 22'5 ; teeth of radula, x 277. 



