PUPOIDES, ADEN. 129 



Arabia: Djebel-Maharas, 10 leagues north of Aden (Col. 

 du Couret) ; Kursi, Aden (Issel). 



Seems to be a large form of "samavaensis". 



100. Bulimus marebiensis Bgt. Shell rimate-perf orate, 

 elongate-oblong, subopaque, corneous, glossy, nearly smooth 

 or, under a very strong lens, obliquely strongly radiatulate. 

 Spire acuminate-elongate, apex smooth, glossy, rather obtuse ; 

 whorls 61/2, convex, regularly increasing, separated by an im- 

 pressed suture, the last whorl % the length, rotund, at the 

 aperture rather strongly ascending. Aperture oblique, a 

 little lunate, ovate; peristome whitish, thick, flatly expanded 

 and acutely reflected throughout ; columella short, immersed, 

 straight; margins approaching, joined by a thin callus bear- 

 ing a tooth at the insertion of the lip. Length 5, diam. 2 mm. 

 Environs of the town of Mareb, at the ruins of the ancient 

 Saba, Arabia, found by Colonel L. du Couret (Bourguignat, 

 Species Novissimas, 1876, p. 23). 



10/. Bulimus vermiformis Palad. (pi. 13, fig. 15). Shell 

 rimate, elongate-subcylindroid, slightly fusiform, corneous, 

 somewhat tawny, rather thin, inconspicuously striatulate in 

 places, little shining, slightly pellucid. Spire drawn out, 

 conic-tapering; whorls 7, convexly swollen, slowly and rather 

 regularly increasing, separated by an impressed suture; last 

 whorl a little larger than the penult, at aperture slightly more 

 than 14 the length ; free margin somewhat arcuate, suboblique 

 to the axis of the shell, regularly, slowly ascending to the 

 insertion. Aperture rounded-elongate, peristome disjoined, 

 simple, a little reflected, the right margin subarcuate, a fold 

 in the parietal margin contiguous to the insertion ; columellar 

 margin a little excavated; basal rounded; the margins nar- 

 rowly but strongly reflected outward. Length 5, diam. 1% 

 mm. (PaladUhe). 



Arabia: Aden (Issel). 



Bulimus vermiformis PALADILHE, Ann. Mus. Civ. Genova, 

 iii, 1872, p. 15, pi. 1, f. 24, 25. 



Paladilhe states that some specimens have up to 7% whorls. 



The Aden forms collected by A. Issel were from debris of 

 the Kursi, a watercourse dry most of the time. The shells are 

 washed down from the high interior of Yemen, and, as usual, 

 forms from many colonies are mingled, hence the variety in 

 form and size. 



