350 AKERIDJE. 



of his B. magdelus Lister, from Middle Harbor and Long Bay, N~. 

 S. Wales. The name " magdelus " seems to be an odd error for 

 amygdalus (Lister, pi. 714, f. 72), a West Indian form. 



The following species described by Schroeter are in my opinion 

 not identifiable with certainty unless the types can be found. All 

 but the latter three or four are undoubted typical Bullas. The 

 localities of none of them are known. 



B. MAPPA Schroeter, Archiv fiir Zool. u. Zoot. (Wiedemann) iv, 

 p. 17, 1804, may be B. oblonga Ad. or solida Gmel. The coloring 

 is hardly that of ampulla. 



B. ADSPERSA Schroeter, t. c. p. 18, may be B. aspersa Ad., B.. 

 solida Gmel., or some other white-sprinkled form. 



B. CINEREA Schroeter, t. c. p. 18, may be amygdala Dillw. 



B. TIGRIS Schroeter, L c. p. 19. Undetermined. 



B. RUFESCENS Schroeter, t. c. p. 19. Undetermined. 



B. DISCORS Schroeter, t. c. p. 19. Undetermined. 



B. NEBULOSA Schroeter, t. c. p. 20, may be B. australis. 



B. MARMOREA Schroeter, /. c. p. 20, may be B. adamsi. 



B. PENNATA Schroeter, t. c. p. 21. Undetermined. 



B. PULVERULENTA Schroeter, t. c. p. 21. Undetermined. 



B. LIGATA Schroeter, t. c. p. 21. Undetermined. 



B. ANNULATA Schroeter, t. c. p. 23. Undetermined. 



B. PUNCTATA Schroeter, t. c. p. 24. Undetermined. 



B. PURPUREA Schroeter, t. c. p. 24, =Ackaiina purpurea Gmel. 



BULLA (BULLEA) CYPRAEOLA Menke, Zeitschr. f. Mai., 1853, p. 

 140, habitat unknown. 



BULLA (BULLEA) NUX Mke., t c. p. 140, from Cuba, may prove 

 to be either B. occidentalis or B. amygdala. 



BULLA (BULLEA) SPLENDENS Mke., t. c. p. 137, habitat un- 

 known. 



Family AKERID^E Pilsbry. 



==Bullid(je in part, of FISCHER, Man. de Conch., p. 558. 



Shell oval or cylindrical, thin and fragile, of a light yellow.. 

 brown or green tint, the spire low or concealed. 



