13/i). ' ON ARACHNIDA FROM THE MASCARENE ISLANDS. 729 



Helix (Eurycratera) ibaraoensis, n. sp. (Plate LVII. 

 figs. 3, 4.) 



Shell imperforate, globosely ovate, moderately solid, shining, trans- 

 versely irregularly rugosely striated in front and very finely granu- 

 lated on the upper whorls, the granules descending to the base 

 behind, yellowish olive, encircled with numerous narrow dark brown 

 bands that lose themselves and become darker towards the aperture 

 and base ; spire flatly convex, apex depressed ; whorls 3|, rapidly 

 increasing, the last very large and inflated ; aperture oblique, large, 

 roundly ovate, pearly bluish violet within ; peristome slightly thick- 

 ened, the margins united by a thick callus ; columella smooth. 



Diam. maj. 3 poll. 6 lin., min. 2 poll. 8 lin., alt. 2 poll. 4 lin. 



Hab. S.E. Betsileo, Madagascar. 



This fine shell somewhat approaches H. magnified, Fer., but is 

 much more globular and compact, with the position of the spire 

 less remote ; and it has also a different style of coloration. 



Examples of this and the preceding species have lately been 

 received from S.E. Betsileo, Madagascar, by Mr. Edward Bartlett, 

 of Maidstone, who has kindly placed them in my hands for descrip- 

 tion. 



EXPLANATION OF PLATE LVII. 



Pigs. 1, 2. Helix (Eurycratera) betsileoensis, p. 728. 

 3, 4. ( ) ibaraoensis, p. 729. 



4. On Arachnida from the Mascarene Islands and Madagascar. 

 By Arthur G. Butler, F.L.S. &c, Assistant Keeper, 

 Zoological Department, British Museum. 



[Eeceived November 1, 1879.] 



(Plate LVIII.) 



Last year a small series of Spiders was obtained through Mr. H. 

 H. Slater from Reunion and Mauritius, of which the following is a 

 list. 



1. Scytodes major, Simon. 

 Plaine des Palmistes, Reunion. 



2. Uloborus borbonicus, Vinson. 

 Mauritius. 



3. Olios leucosius, Walckenaer. 



Mauritius. 



The identification of these three species, however, is a little doubt- 

 ful, owing to the imperfection of the figures in Vinson's ' Arane'ides 

 des iles de la Reunion ' &c. 



47* 



