152 HOMORUS, WEST AFRICA. 



H. nebulosa Morel, in color, the attenuate spire, strong 

 peripheral keel, etc. 



30. H. SUBCRENATUS (Boettger). 



Shell large, not rimate, turrite, club-shaped, thin, glossy, 

 corneous-yellowish, covered with a brownish cuticle irregu- 

 larly ornamented with numerous obsolete darker streaks; 

 darker towards the aperture. Spire cylindric-turrite, the 

 apex mucronate, cylindric, obtuse. Whorls 12, very slowly 

 increasing, wider than high, a little convex, separated by a 

 slightly impressed suture, distinctly crenate from the be- 

 ginning, striatulate, the striae deeper and more distinct at 

 the suture; the last whorl well rounded, its height one and 

 one-half times that of the penultimate whorl, and, scarcely 

 one-fourth the length of the shell; the base usually worn. 

 Aperture irregularly ovate, more acute above than below. 

 Columella slender, deeply concave, sigmoid, abruptly truncate 

 at base, deeply excised and canaliculate, the margins joined 

 by a thin callous. Length 54, diam. 13.5, diam. of third 

 whorl 3 mm.; alt. of aperture 13, width 7.5 mm. (Bttg.). 



West Africa: Akkra on the Gold coast (E. St. Vraz). 



Pseudoglessula subcrenata BTTG., Nachrbl. d. d. Malak. Ges. 

 1892, p. 202. 



"Differs from the West African Pseudoglessula species 

 known to me by the blunt, cylindric summit set upon a some- 

 what club-shaped shell, the suture from the apex on appear- 

 ing very strongly crenulated. These sutural denticles gradu- 

 ally diminish, but usually are lost only on the last whorl to- 

 wards the mouth " (Bttg.). 



31. H. BACILLIFORMIS (Jonas). PL 59, fig. 69. 



Shell long-turrited, narrow, thin, fragile, milk-white cov- 

 ered with a buff cuticle, longitudinally striated. Whorls 9 

 (the upper ones broken), a little convex, slowly increasing, 

 separated by an impressed suture, which is seen to be crispate 

 under a lens; the last whorl small. Aperture small, oval; 

 columella arcuate, truncate; lip simple. Length of specimen 

 broken above 11.5, width of last whorl 2.5 lines [about 23 x 5 

 mm.] (Jonas). 



