18 



BULLETIN 125, UNITED STATES NATIONAL MUSEUM. 



Geological distribution. — Stampian, environs of Paris (Canu) ; Helvetian of 

 Touraine (Collection Canu); Astian of England (Busk). 



Habitat. — Arctic Ocean: Franz Josef Land (16-205 meters) (Waters), Barentz 

 Sea. Eastern Atlantic: English Channel, North Sea off Germany, Denmark, 

 England, Norway (19-24 meters). Gulf of Gascony (17-180 meters), mouth of the 

 Tagus, Cape Verde Islands. Western Atlantic : Woods Hole (3-30 meters) , Panama. 



This species lives principally at the mouth of streams and large rivers. 



Plesiotypes.—Cixt. Nos. 68396-68398, U.S.N.M. 



E.Pyripora 



F.Heterooecium 



Fig. L— Genera of the family Electrinidae D'Orbigny, 1851. 

 A. £fec«ro Lamouroux, 1816. £. piiosa Linnaeus, 1758, X 46. Recent' 



-a. Membrmnpom Blain^■ille, 1834. M. membranacea Linnaeus, 1758, X 15 (left) and M. tuberculata 

 JJose, 180J, X 20. Recent. 



C. Herpetopora Lang, 1914. //. anglica Lang, 1914, X 27. Cretaceous (after Lan.- 1914) 



D. Mystnopora Lang, 1915. M. mockleri Lang, 1915, X 26. Cretaceous of England 



nc«n^' ^'"'^°™ D'Orbigny, 1852. P. catenularia Jameson, 1914, X 25. Recent. (A E., after Hincks. 



19090' '^'''''"""'"'" °'°''''' ^^^^- "■ '''^VlecUm Ilincks, 1892, X 55. Recent. (After Levinsen. 



