— 26 — 



Akera 0. F. Miiller. coutin. 



Etym. ax8Qog, non cornutus. 



Novum genus Univalvium testa patulo. Typus: 



Bulla akera Gmel. 

 CuviER 1812. Ann. du Mus. tom. 18. * et 1817. 

 Regne an. * ct 1830. R. a. ed. 2a (ed, Voigt. III. 

 p. 135.) — genus Tectibranchiatorum. Subge- 

 nera: Doridium, Bullaea, Bidla. 

 ScnwEiGG. 1820. Natgesch. p. 744. — genus Poma- 

 tobranchiorum. Subgenera: Doridium, Bullaea, 

 Bulla. 

 Coiifer. Blainv. in Dict. sc. nat. I. suppl. p. 16. sub 

 voce Aceres. 

 = Bullaeacea Lamck. 

 Akera subg. Clvier 1812. Ann. du Mus. tom. 18. * et 1817. 

 R. a. * e( 1830. R. a. ed. 2a (ed. Voigt. III. p. 140.) 

 = Doridium Meckel. 

 Akera Blaiw. 1825. Malac. p. 476. 



Monopleurobranchiorum famib^aquarta. Genera : BuIIa, 



Bellerophus, Bullaea, Lobaria, Gasteroptera, Atlas. 



Akera G. B. Sow. jun. 1839. Conch. Man. (ed. 2a p. 60.) 



Subgenus Bidlae. Tvpus: Bulla akcra Gmel. 

 Alaea Jeffreys 1820. Trans. Linn. Soc. vol. 13. * 

 Etym. aXaios, caecus. 

 A Pupis segregaluin genus. Typicae spccies: Pu[)a 



museorum Linn. ct antivertigo Drap. 

 Pariter G. B. Sow. 1839. Man. et 1842. ed. 2a 



p. 61. 

 Beck 1837. Ind. p. 85. — subgenus Pupae, arctius 



constrictuin. Typus: Pu|)a antiverligo Drap. 

 SynoiK Istlunia Gray. 

 Pupella (pars) Swains. 

 Alai^Biaidia Rafinesoue 1820. Monogr, Biv, Ohio. * teste 

 Desh. Enc. meth. II. p. 13. 

 Eiym. vid. Alasmidonta. 

 Pedilerorum tribus. Unicum genus: Alasmidonta. 



