BOETTGEll : ON NEW AFIilCAN LAND SHELLS. 353 



increasing in size, separated by a very flat suture, the last wliorl 

 measuring about f the length of the shell ; aperture oblong-ovate, 

 oblique, displaying the external band ; peristome simple, acute ; the 

 margin of the whitish columella forming a very indistinct angle with 

 the basal margin. 



This beautiful little shell can easily be recognized by its legular 

 conical shape and its ])retty markings. I received it from Mr. M. 

 Stahlberg, in honour of whom it is named. 



12. Rhachis obeliscus, n.sp. PI. XVIT, Fig. 4, 



Testa rimata, elongata, conica, fere ecarinata, flavo - albescens, 

 guttis parvis nigro-cseruleis ii-regulariter picta, ad carinam linea 

 I'usco-purpurascente ornata ; apex niger ; anfractus 7-h, superiores 

 subconvexi, sequentes plani, sutura plana separati ; ultiraus circa 

 f longitudinis totius sefjuans ; apertura oblongo - ovata, oblicjua, 

 tusco-purpurascens, linea externa translucente ; peristoma simplex, 

 acutum ; raargo columellaris purpurascens, cum basali angulum 

 indistinctissimum formans. Long. 22*5, diam. ll"5mm.; apertura, 

 alt. 1 1'5, lat. 7 mm. 



Sab. — Kipatimu, German East Africa. 



Shell rimate, elongate, conical, very faintly keeled, yellowish 

 white, irregularly dotted with small dark-blue spots; at the keel 

 ornamented with a purplish-brown band ; apex black ; whorls 7^, 

 upper whorls moderately convex, the others flat, regidarly increasing 

 in size, separated by a flat suture, the last whorl measuring about 

 |- the length of the shell; aperture oblong-ovate, oblique, purplish 

 brown, displaying the external band; peristome simple, acute; the 

 margin of the pui'ple columella forming a very indistinct angle with 

 the basal margin. 



This new species was received from ^Ir. G. Naegele. 



13. Ligatella LETOURNEUxr, Bourg., var. intekmedia, n.var. 

 PL XVII, Figs. 5-6. 



Differt a typo figura raajore. Testa linea brunnea lata et alia 

 angustiore superiore ornata. Alt. 16-5 mm. ; diam. mag. 17, min. 

 14 mm. ; apertura, alt. 9-5, lat. 8-5 mm. 



JJab. — Kipatimu, German East Africa. 



This new sub-species differs from the typical form iu being 

 constantly larger, but never so large as var. Stuhhnanni, v. ]\[art. 

 The shell is ornamented with a dark-brown band and a paler one 

 above it. I received this fine new form from Mr. G. Naegele. 



EXPLANATION OF PLATES XV-XVIL 

 Plate XV. 



Figs. 1-3. Trochonanina Germnini, n.sp. 



,, 4-6. Thapsia calamichroa, Jon., var. depr&ssa, n.var. 

 ,, 7. Ennea (Gulella) qitinqiiedentata, n.sp. 

 ,, 8. Edentulina affinis, n.sp. 

 ,, 9. E. affinis, var. gracilis. 

 .,, 10-12. Gonaxis helicoides, n.sp. 



