CYLICHNA. 311 



0. biplicata AD., Thes., p. 593, pi. 125, f. 143. COOKE, Ann. 

 Mag. N. H., (5), xvii, p. 128. 



C. MONGII Audouin. PL 27, fig. 96. 



Shell quite small, delicate, ovate-cylindric, slightly more con- 

 tracted below than above, white, smooth, not striate nor sulcate, a 

 little shining ; apex concave, not perforated ; aperture narrow, a 

 little larger below than above ; right margin regularly arcuate, sim- 

 ple, rising above the vertex at the upper part ; visible portion of the 

 columella quite short and not truncated. Alt. 2, diam. 1 mill. (J- 



sel~). 



Red Sea. 



SAVIGNY, Desc. de FEgypte, pi. v, f. 7. Bulla mongii AUD., 

 Expl. des PL de Savigny, etc., p. 178, l827. Cyliehna mongii 

 ISSEL, Mai. Mar Rosso, p. 170. 



. BACILLUS Ehrenberg. Unfigured. 



Shell cylindrical thin, transversely striated throughout, white; 

 lip adnate above, not plicate, the other end rounded. One empty 

 specimen seen, which is in the Berlin Museum. Length 4|, width 

 2 lines. Aperture extends beyond the body at both ends ; lip not 

 inflexed ; spire not umbilicate. (Ehrenb.). 



Eed Sea. 



Bulla bacillus EHRENB., Symb. Phys., Bulla, sp. 6. 



C. PULVISCULUS Ehrenberg. PL 27, fig. 95. 



Shell semilinear, oblong, cylindrical, thin, transversely striated at 

 both ends, dull whitish ; lip adnate above, not plicate, rounded at 

 the other extremity. Alt. I, diam. lines. (Ehrenb.). 



Arabian shore of the Eed Sea; Suez. 



Bulla pulviseulus EHRENB., Symb. Phys., Anim. Evert., Bulla, 

 no. 8. Cylichna pulviseulus ISSEL, Mai. Mar Rosso, p. 169. 

 COOKE, Ann. Mag. N. H., (5), xvii, p. 128. SAVIGNY, Descr. de 

 PEgypte, t. v, f. 6. Bulla desgenettii AUDOUIN, Expl. PL Savigny, 

 p. 178, (1827). Bulla ( Cylichna') pulvisulcus A. AD., Thes. ii, p. 

 602. 



C. MICA Ehrenberg. PL 27, fig. 94. 



Shell semilinear, cylindrical, thin, longitudinally striated through- 

 out, not transversely sculptured, white, the lip adnate above, not 

 plicate, rounded at the other extremity; spire flat. Alt. I, diam. 

 i of a line. (Ehrenb.*) 



Eed Sea ; Suez. 



