BELA. 221 



surface and canal distinguish this from B. exarata (a form of B. 

 turricula}. A var. acuta is described by Prof. Yerrill as having 

 a more slender form, with a longer and more acute spire and 

 narrower aperture, the whorls more flattened, the nodules on the 

 shoulder more prominent and sharper, and the carina higher; 

 there are intermediate forms between this and the type. It is 

 the B. mitrula of Verrill, not Loven. B. Molleri, Reeve (PI. 27, 

 fig. 27), is a rather problematical species, which Petit refers to 

 B. Trevelyana, and Jeffreys to B. exarata, Moll. It appears to 

 me to agree better with this species ; it is a young shell, the 

 figures being about twice its natural size, and its identification 

 with B. concinnula is not sufficiently certain to authorize a 

 change of name. 



B. TREVELYANA, Turton. PL 33, fig. 65 ; PI. 27, fig. 29. 



Shell somewhat thin, ovately fusiform, subventricose ; whorls 

 six, slightly planate above the carina: aperture nearly equally 

 contracted above and below ; outer lip a little insinuate below 

 the shoulder ; surface lightly decussated by inconspicuous longi- 

 tudinal plications, evanescent below the middle of the body-whorl, 

 and close, fine revolving striae ; whitish. Length, 8-13 mill. 



Europe, Spitzbergen, Nova Zembla, Boreal America. 



A smaller, more fragile and more delicately sculptured species 

 than B. turricula, with shorter spire, and more oval form. The 

 synonymy includes B. decussata, Macgill. (PI. 27, fig. 29) and 

 B. reticulata, Brown. The latter name has priority, but may be 

 regarded as obsolete. A variety Smithii, described by Jeffreys, 

 is doubtfully referred by Yerrill to B. incisula, Yerrill (= 

 decussata, Couth, var.). 



B. CONOIDEA, Sars. PL 29, fig. 61. 



Shell narrow, with long spire ; whorls seven, convex, without 

 carina; plications slight, somewhat sigmoid, almost obsolete on 

 the body-whorl : everywhere covered with moderately strong 

 revolving striae ; white. Length, 15 mill. 



Norway. 

 B. LYCIACA, Forbes. PI. 27, fig. 28. 



Shell rather shortly fusiform, whorls convex, narrowed at the 

 upper part, longitudinally ribbed, with revolving elevated striae, 



