150 NATURAL HISTORY OF ARCTIC AMERICA. 



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

 Gulf of St. Lawrence. This genus, with an Eschariue growth, has aper- 

 tures much as in Escliarina, 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. STcenei, with median avicularia, the type of Lamarck being _D. verru- 

 cosa, a species closely related to D. Skenei, but not the Cellepora verru- 

 cosa of Esper, a very different form, to which Gray erroneously restricted 

 this generic name. 



Celleporella hyalina 'L.^ Gray. 



Cellepora Jiyalina LiNisrfi. 



Mollia Jiyalina SMITT, op. cit. p. 16, tab. xxv, f. 84, 85. 



Hippothoa hyalina SMITT, Florida Bryozoa. 



Very common, Annan actook Harbor, 7 fathoms, on Laminaria, May 

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

 Margarita helicina, October 4, 1877, lot 226. Gravel beach, head of Gulf 

 of Cumberland, May 28, 1878, lot 642, and on Halocyntliia rustica, lot 

 572, May 19. 



