C^CILIOIDES OF AFRICA AND ARABIA. 35 



Turkestan: Totkaul (Kasnakow, in Zool. Mus. St. Peters-, 

 burg). 



Cacilianella (Aciculina) praclara WESTERL., Annuaire Mue. 

 Zool. Acad. Imp. Sci. St. Petersburg, iii, 1898, p. 176. 



31. C. RETTERI Rosen. 



Shell fusiform, slender, whitish-glassy, pellucid, the apex 

 obtuse; whorls 5, very slightly convex, the penultimate nearly 

 as long as those above it; aperture drop-shaped; columella 

 arcuate; peristome a little protracted below the middle. Length 

 4.5 to 4.75, diam. 1.25, alt. aperture 1.75 mm. (Rosen). 



Central Asia: Aman-Kutan. 



Cacilianella retteri ROSEN, Nachrbl. d. D. Malak. Ges. vol. 35, 

 Dec. 1903, p. 181. ROSEN Moskva Izv. Obsc. Hub. jest. Dnevn. 

 Zool. iii, 3, 1901. 



Species of South and N. -E. Africa and Arabia. 



32. C. AD VENA Ancey. 



Shell slender, imperf orate, tapering-subfusiform, diaphanous, 

 polished, whitish-hyaline. Spire long-subconic, the apex ob- 

 tuse. Whorls a little more than 5, subconvex, separated by a 

 well impressed and delicately margined suture, flattened in the 

 middle, the first two regularly, lower whorls more rapidly in- 

 creasing, the suture there being more oblique; last whorl more 

 than one-third the total length of the shell; the sides convex 

 beyond the middle, tapering at the base. Aperture long, piri- 

 form, subvertical, in the middle of the parietal wall distinctly 

 angularly thickened within. Columella below the angle broadly 

 arcuate, obliquely truncate at base. Peristome simple, unex- 

 panded, acute, the outer margin arcuately produced forward, 

 basal margin receding; margins remote, joined by a distinct 

 callus. Length 4! 33, diam. 1.25, aperture 1.5 x 0.66 mm. 

 (Anc.) 



S.-W. Africa: Disappointment Key, Ovampoland ("Luder- 

 itzland," or Damara). 



Ccecilianella advena ANCEY, Le Naturaliste x, 1888, p. 215. 

 "This Cecilianelle resembles some of those known as inhabitants 

 of temperate Europe and North Africa, without being assign- 

 able to any of them." 



