\KI 



Tin* shell of this L r 'inis is peculiar in its sutural minis or slit, and 

 tin- wholly exposed spire. Tin- animal is ehararteri/ed l>y tin- 

 long and narrow head shield, the epipodial lobes bein<j as in // 

 m-<i. The dentition also resembles that of Ilmnuixi, but the stom- 

 ach is differently armed. 



The young animals use tbe epipodial lobes as swimming organs, 

 flitting about like butterflies. 



A. nn.i.ATA M.iller. PI. 42, figs. 11, 12, 17. 



Shell fragile, ovate, squarely truncated above, the spire nearly 

 flat and encircled by an acute keel as in A. soluta ; covered with a 

 thin pale brownish epidermis; surface densely microscopically 

 striated. Aperture nearly as long as the shell, narrow above and 

 deeply sinused, gradually widening below, becoming broadly round- 

 ed at base ; outer lip arched forward in the middle ; columella sim- 

 ply arcuate with a thin reflexed, appressed callus. Alt. 14, diam. 

 9 mill., sometimes larger, alt. 28 mill. 



Norway and seas of North and West Europe generally ; Mediter- 

 ranean. 



Akera bullata MULL., Zool. Danica, p. 242, pi. 71, f. 1-5 (1776). 

 FORBES & HANLEY, Hist. Brit. Moll., p. 527, pi. 114d, f. 4-6 

 (shell) ; pi. vv, f. 6 (animal). Sown., Conch. Icon., f. 6. Accra 

 bullata MEYER & MOBIUS, Fauna Kieler Bucht., p. 81, plate (ani- 

 mal). SARS, Moll. Reg. Arct. Norv., p. 281, pi. 26, f. 1 (shell), pi. 

 xii, f. 17 (dentition, anatomy). LANGERHAUS, Zeitschr. Wissensch. 

 Zool., xxiii, p. 171, pi. 8 (embryology), abstract in Zool. Rec., ix, p. 

 151. MAZZARELLI, Zool. Anzeiger, xiv, p. 241, f. 6 (genitalia). 

 VAYSSIERE, Rech. Moll. Opisth., p. 23. JEFFREYS, Brit. Conch., 

 iv, p. 430; v, pi. 95, f. l.Aceras bullatum LOCARD, Coq. Mar. France, 

 p. 24, f. U.Bulla akera GMEI,, Syst. Nat. (13), p. 3434, and of 

 MONTAGU, FLEMING, DILLWYN, WOOD, and other early English 

 conchologists. B. norvegica BRUG, Encycl. Meth., i, p. 377, pi. 

 360, f. Bulla reviliens DONOVAN, Nat. Hist. Brit, shells, pi. 71), 

 (1804). B. fracjilis LAM., An. s. Vert. (edit. Dh.) vii, 67l>. 

 BLAINV., Man. Malac., pi. 45, f. 7. Sown., Conch. Man., f. 247. 

 Akera flex'dis BROWN, Illustr. Conch. G. B., p. 59, pi. 19, f. 31, 32. 

 B. (A.) bullata A. AD., Thes. p. 572, pi. 121, f. 41. B. (J.) 

 hanleyi A. AD., /. c. p. 573, pi. 121, f. 46. Eucampe donor* mi 

 LEACH, Syn. Moll. G. B., p. 42. Bulla <'<ni<iHculnt<< OLIVI, <t. <tl., 

 and possibly of LINN.*;US, see HANLEY, Shells of Linn., p. 207. 



