378 AKERA. 



B. glohosa Cantraine, Mai. Medit., p. 82. — B. elasttca Danilo & 

 Sandri, Gast. Test. Mar., p. 26, (1856), c/. Brusina, Contr. pella 

 Faun. Moll. Dalm., p. 10. — Aceras elegans Locard, Coq. Mar. 

 France, p. 24. 



Smaller, more tapering toward the ends and less cylindrical than 

 A. soluta. Long as is the above list of references, it could readily 

 be doubled ; but everything of value is believed to be here in- 

 cluded. 



A. SOLUTA Gmelin. PI. 42, fig. 18. 



Shell large, fragile, cylindrical, tapering toward the ends ; cov- 

 ered with a thin pale yellowish-brown epidermis. Spire projecting 

 but low and obtuse, terraced ; shoulder of whorls acutely keeled, a 

 flat, wide anal fascicle between keel and the deeply impressed suture. 

 Whorls nearly 5, the first one a minute, uptilted and half immersed 

 apical nucleus; body whorl forming most of the shell, densely 

 spirally striated throughout. Aperture narrow in its upper half, 

 with a wide posterior sinus extending back about a third of a 

 whorl ; lower half dilated and ovate, effuse at base. Outer lip fra- 

 gile, arching forward in the middle ; columella very concave, with 

 a narrowly reflexed cord-like edge. Alt. 45, diam. 25 mill. 



Zanzibar; Querimba Is. (Peters); 3Iauritius (JJiensLYd) ', Ceylon 

 (Thorne) ; PhiUppines (Cuming) ; Torres Straits (Cuming) ; Fort 

 Jackson, Port Lincoln, Hardwick Bay, Botany Bay, etc., New South 

 Wales (Angas) ; Spencer's Gulf, S. Australia (Angas). 



Bulla soluta Gmrl., Syst. Nat. (13), p. 3434.— A. Ad., Thes ii, 

 p. 572, pi. 121, f. 40. — Akera soluta Sowb., C. Icon., f. 4. — Angas, 

 P. Z. S., 1865, p. 189 ; 1867, p. 227.— Smith, Zool. Coll. Alert, p. 

 87. — Martens, Mobius' Reise n. Maurit., p. 803 ; Monatsber. K, 

 Akad. Wissensch., 1879, p. 738, and of many authors. — B. ceylan- 

 ica Brug., Encyc. Meth., i, p. 377. — B. (A.) tenuis A. Adams, Thes. 

 ii, p. 573, pi. 121, f. 45.— Sowb., C. Icon., f. 7. 



The spire in this form projects more than in any of the other spe- 

 cies. It varies much in size, some Australian specimens being less 

 than half the dimensions given above. Fig. 16 of plate 42 repre- 

 sents the A. tenuis of Adams, which Angas and Smith agree is a 

 synonym. A. Adams and Sowerby have given an incorrect syn- 

 onymy. The animal has been figured by Arthur Adams (Zool. 

 Samarang, pi. 18, fig. 2). 



