OBELISCELLA. 101 



The name Obeliscella was proposed as a substitute for 

 O'beliscus Beck, but it was first used for the species B. lucidis- 

 simus, which is, in fact, the only species mentioned in Jous- 

 seaume's note. Professor von Martens, whose general know- 

 ledge of land shells has probably never been surpassed, re- 

 cognized features which led him to suspect an affinity to 

 Ennea. Although we have as yet no anatomical knowledge 

 of the Arabian form, I have little doubt that it will prove 

 to belong with Ennea, Elma, Streptostele etc., in the Agna- 

 thous family Streptaxidce. The genus is included here merely 

 for temporary convenience, because the shell would naturally 

 be looked for in or near Opeas. 



O. LUCIDISSIMA (Paladilhe). PL 26, figs. 35, 36, 37. 



Shell imperforate, elongate-subcylindric, nearly smooth, 

 very glossy, subpellucid, amber or white-hyaline, quite solid. 

 Spire a little attenuated above, the apex obtuse. Whorls 

 9%, scarcely convex, slowly increasing, separated by a super- 

 ficial suture which is margined below; the last whorl at the 

 aperture over one-fourth the total length, a little ascending 

 to the aperture; its free margin straight oblique, strongly 

 receding. Aperture oblique, rounded-subpiriform, angled at 

 the insertion of the outer lip ; peristome unexpanded, slightly 

 subpatulous; columella rather wide above, reflexed, narrow 

 below; right margin much longer, rather arcuate,, the mar- 

 gins joined by a conspicuous callus. Length 15, diam. 4 

 nun. (Palad.) 



Arabia: near Aden (Issel) ; debris of the torrent Kursi 

 near Aden (Jouss.). 



Bulimus lucidissimus PALAD., Ann. Mus. Civ. Genova iii, 

 1872, p. 17, pi. 1, figs. 18, 19. PFE., Monogr. viii, p. 134. 

 Oleliscella lucidissima Bgt., JOUSSEAUME, Bull. Soc. Mai. 

 France vi, 1889, p. 359. 



Readily distinguished by its regularly tapering, obtuse- 

 topped shape, brilliant gloss, the closely appressed columellar 

 callus and blunt, smooth lip. A single specimen before me 

 measures 13.5 mm. long, 3.8 wide, the aperture 3.5 mm. long. 

 It has 9% whorls. The dimensions are therefore between 



