1870.] On the Land Shells of Bourbon. 415 



38. Omphalotropis rubens, Quoy, Voy. cle l'Astrol. p. 189, (var. 

 Moreleti, Desh. Moll. delaKeun. p. 81). 



Of this species I found two varieties, one tlie typical, often 

 undistinguishable from the Mauritian form ; the other a slightly 

 smaller variety, named by D e s h a y e s, 0. Moreleti, Moll, de la 

 Keun. p. 84 ; it is a little smaller, more attenuated, the whorls 

 are slightly less ventricose, and the sculpture, though the same, 

 a shade more obsolete, the broad brown bands round the whorls 

 are very striking and are nearly always more or less present, 

 the Bourbon typical form also often possesses them, though not 

 so generally ; at Mauritius, on the contrary, the striped variety, 

 is very rare indeed, in this respect presenting a remarkable 

 analogy to Helix similar is, of which Deshayes has also made a 

 species from an extreme form, as I have previously mentioned, which 

 may well be compared with his Omphalotropis Moreleti in their re- 

 lationship to their respective type forms. 



89. Omphalotropis Borbonica, H. A d., Proc. Zool. Soc. 1868, 

 p. 289. 



This very distinct species cannot be confounded with any other 

 of the genus, it can instantly be distinguished from 0. rubens, 

 with which it agrees in size, by its being very minutely and indis- 

 tinctly spirally punctated, instead of finely, distinctly, longitudinally 

 striated, the whorls are much more convex, the last one more 

 ventricose, the outer margin of the aperture not reflexed, the 

 colouring more constant and more sombre, the umbilicus wider, 

 the keel scarcely raised, obtuse, and broad, instead of narrow, 

 acute and thread-like. In the plate accompanying Mr. Adams' 

 description, the colouring does not give a quite correct idea, the 

 ground colour is a darkish brown, sometimes indeed without 

 any markings at all, but generally minutely and rather closely 

 maculated with dull yellow, in rather a zigzag manner, the broad 

 keel also, where it shows through in the interior of the aperture, as 

 it does in fresh specimens, should be of a light yellow and not dark 

 brown. I think too in the description, it should not be " et circa 

 perforationem eompresse carinato," as it is decidedly less compressly 

 carinated round the umbilicus than its near ally, the type of the 

 genus, 0. rubens. In damp woods, tolerably abundant. 



