African Non-marine MoUusca. 353 



Homorus ilUtus, sp. n. (PI. I. fig. 2.) 



Shell large, elongate-turriform, imperforate, rather solid, 

 rather rugose, but shining, translucent, chestnut-brown. 

 Spire produced, sides regular, apex acutely mamillate 

 Whorls 11, ratlier flat, gradually increasing, the first micro- 

 punctate, 2nd and 3rd nearly smooth, with very faint, 

 irregular, scratchy spiral lines: commencing faintly in the 

 suture of the 3rd whorl, the remainder are covered with 

 regular, nearly flat, curved, moderately oblique transverse 

 striie, curved backward in the upper suture and fainter on 

 the lower half of each whorl ; the spiral sculpture continues 

 nearly throughout, being visible, in patches, with a weak 

 lens ; suture simple, shallow. Aperture subovate, interior 

 pale blue with a narrow brown border; peristome simple, 

 acute; outer lip nearly straight in profile, receding mode- 

 rately to the base; columella short, concave, abruptly 

 truncate at its extreme base ; paries white, devoid of 

 epidermis. 



Long. 31-5, lat. 7*9 ; apert., alt. 67, lat. 3-9 ; last whorl 

 11*5 mm. 



Hab, KenYxV, Lari (Gooc/i), 



Type in British Museum. 



A fine species, whose solid, varnished, unicoloured chest- 

 nut shell appears to differ from any other of the genus. 



Homorus involutus (Gould), 1844. 



1837. Helix funiculata, Valenciennes MS. (in Paris Museum). 



1844. Achatma invuluta, Gld. Proc. Boston Soc. i. p. 158. 



1846. Achat inafraseri, Pfr. Symb. iii. p. 90. 



1861. Achatma foxo'ofti, Pfr. P.Z.S. p. 25. 



The above synonymy may be accepted as correct. Pfeiffer 

 himself acknowledged that fraseri was identical with invo- 

 lutus^ and careful examination of the ww^gwvQ^foxcrofti, the 

 type of which is in the British Museum, proves it to be 

 quite inseparable. As mentioned by d'Ailly, a prominent 

 feature in H. involutus is the strong, distant rib-striation in, 

 or just below, the early sutures after the first 1^ whorls. 

 The type set of foxcrofti are much bleached, but retain 

 enough of the epidermis to show that it was originally dark 

 brown, while they agree both in form and sculpture with 

 Gould's species. 



Homorus zehra^ sp. n. (PI. I. fig. 3.) 



Shell rather large, elongate-turriform, imperforate, rather 

 thin, smooth, shining, pale yellow, the first 4 whorls rather 



