ATYS. 279 



representation of his species, is sufficient to fix its identity beyond 

 doubt. Compare A. diaphana Arad. 



Subgenus ROXANIA Leach, 1847. 



For anatomy see under Atys. 

 A. UTRICULUS Brocchi. PL 28, figs. 28, 29. 



Shell oval, with a tendency to become cylindrical, rather solid, 

 semitransparent and glossy . sculpture, numerous spiral striae or im- 

 pressed lines, which are visible to the naked eye ; towards each end 

 they are stronger, and alternately large and small (sometimes two 

 or three smaller strke between two of the larger size), and they are 

 throughout closely pnnctate in consequence of the interstices being 

 crossed by fine longitudinal stride ; the spiral striae are much slighter 

 in the middle of the shell, which in the young is usually quite 

 smooth ; epidermis reddish-brown, it is chiefly persistent on the 

 spiral striae, which are, therefore, darkly lineated ; color pale yel- 

 lowish or cream color, occasionally milk-white ; spire partly ex- 

 posed ; crown perforated, and obliquely encircled by a thick angu- 

 lar rim ; mouth as in H. navicula, but narrower, its length ex- 

 ceeds that of the spire ; outer lip not much curved in the middle, 

 nor folding inwards ; it projects a little beyond the crown ; inner 

 lip slight ; pillar short, thick, and flexuous ; at its base is a rather 

 strong fold, which makes the lower part of the mouth appear chan- 

 nelled ; behind the pillar is a small and groove-like umbilicus 

 G/e/r.). Alt. 12, diam. 7* mill. 



Var. oblonga. Smaller, longer in proportion to its breadth, and 

 more cylindrical (Jejfr.~). 



Finmarlc to the Canary Is. ; Mediterranean Sea. 



Bulla utrieulus BROCCHI, Conch. Foss. Subap. i, p. 633, pi. 1, f. 

 6. Bulla utrieulus JEFFR., Brit. Conch, iv, p. 440 ; v, pi. 95, f. 4. 

 Bulla cranchii LEACH, in Flemings' Brit. An. p. 292. FORBES 

 & HANLEY, Hist. Brit. Moll, iii, p. 533, pi. 104, f. 8, 9, and pi. VV, 

 f. 2 (animal). Atys cranchii AD., in Thes. ii, p. 586, pi. 125, f. 

 115. SOWB., in Conch. Icon. pi. 1, f. 9. Bulla punctura JOHNSON, 

 Edinb. New Philos. Journ. 1828, p. 79. Roxania utrieulus MONTS., 

 Nom. Gen. e Spec. p. 145. Bulla intermedia ARADAS. 



A. PUNCTULATA A. Adams. Unfigured. 



Shell ovoid, solid, perforate, rounded at each end, decussate stri- 

 ate, transversely profoundly sulcate, the sulci strongly punctate. 



