312 CYLICHNA. 



Bulla mica Ehrenb., Symb. Pbys., Bulla, no. 7. — Cylichna mica 

 IssEL, Mai. Mar Rosso, p. 169. — Bulla fourieri Aud., Expl. pi. 

 Savigny, p. 178. — Savigny, Descr. pl.v, f. 5. 



The figure of Savigny, which is the only illustration yet pub- 

 lished, evidently represents this species, says Issel, but does not 

 show the characteristic longitudinal stride. 



In the case of this species as well as the preceding, Issel adopts 

 Ehrenberg's name instead of the earlier one of Audouin, evidently 

 because Ehrenberg gave descriptions. 



C. viLLiERsi Audouin. PI. 27, fig. 98 ; pi. 59, fig. 7, (minuta). 



Shell quite small, fragile, translucent, a little attenuated below, 

 not striated ; apex flattened. Si)ire two whorled, the second of 

 which does not completely envelope the first ; last part of the sec- 

 ond whorl divided from the body of the shell by a profound sinus ; 

 aperture linear, narrower in the middle and above than toward the 

 base; right margin subrectilinear ; left margin almost rectilinear 

 above, sinuous below. Alt. 1, diam. J mill. (Issel). 



Bed Sea. 



Savigny, Descript. de I'Egypte, Coq., t. v. f. 4. — Bulla villiersi 

 Aud., Expl. des PI. de Savigny, xxii, p. 178, 1827. — Cylichna vil- 

 liersi Issel, Mal. Mar Rosso, p. 170. — Cooke, Ann. Mag. N. H., 

 (5), xvii, p. 128. — ? Cylichna minuta H. Adams, P. Z. S., 1872, p. 

 11, pi. 3,f. 10.— Conf. Ann. Mag., (5), xvii, p. 129. 



The C. minuta is thus described : " Shell cylindrical, thin smooth, 

 subpellucid ; aperture linear, dilated anteriorly, columella short, 

 simple ; lip a little produced behind, the margin arcuate. Alt. I5, 

 diam. i mill. Red Sea." 



C. PERPUSILLA E. A. Smith. JJnfigured. 



Shell very minute, oblong-ovate, wider above than at the base^ 

 pellucid, smooth throughout, shining ; aperture moderately wide 

 above, produced above the vertex, a little dilated at base. Vertex 

 imperforate, slightly depressed through the rising of the lip ; col- 

 umella slightly thickened, scarcely twisted. Al, I4, diam. f mill. 

 {Sm.). 



Persian Gulf, 14 fms. (Col. Pelly). 



C. perpusilla Sm., Ann. Mag. N. H., (4), ix, p. 353. 



One of the smallest forms yet discovered. It is quite smooth, 

 white and shining, of an oval form, rather narrower at the base 

 than toward the vertex. (Sm.). 



