150 NATUEAL HISTORY OF ARCTIC AMERICA. 



{E. lobata (Lamx.)=^. Sarsii Smitt, and U. rosacea), both common in the 

 Gulf of St. La^^Tencc. This genus, with an Escharine growtli, has aj^er- 

 tures much as in Uscharina, except that the lateral avicularia are situ- 

 ated within their borders by the side of the sinus. 



Discopora Lam., following Edwards, should be restricted to forms like 

 D. Slicnei^ with median avicularia, the type of Lamarck being D. verru- 

 cosa^ a species closely related to D. SJcenei, but not the Cellejpora verru- 

 cosa of Esper, a very dift'erent form, to which Gray erroneously restricted 

 this generic name. 



Celleporella hyalina '1j.\ Gray. 



('cllij)ora Jnjaliua LiNXl^;. 



MolUa hyalina Smitt, op. cit. p. 16, tab. xxv, f. 84,85. 



Ilippotlioa hyalina Smitt, Florida Bryozoa. 

 Very common, Annanactook llarbor, 7 fathoms, on Luminaria, May 

 19, and 9 fathoms, May 20, 1878, lot 570. Penny Harbor, low-water, on 

 Margarita helicina, October 4, 1877, lot 220. Gravel beach, head of Gulf 

 of Cumberland, May 28, 1878, lot G42, and on Ilalocynthia rusttca, lot 

 572, May 19. 



