lOO 



BULLETIN OF THE BUREAU OF FISHERIES. 



Tubularia crocea (chart 19). 

 Clytia cylindrica. . 

 Campanularia verticillata. 

 Obelia commisuralis. 

 *Obelia geniculata (chart 20). 

 Hebella sp. undet. 

 Keratosum complexum. 

 Lovenella grandis. 

 Opercularella pumila. 



Calycella syringa. 

 *Halecium halecinum (chart 21). 



Sertularia pumila. 

 *Thuiaria argentea (chart 22). 



Thuiaria cupressina. 



Sertularella gayi. 



Sertularella tricuspidata. 



Hydrallmania falcata. 

 *Schizotricha tenella (chart 23). 



ACTINOZOA. 



*Alcyonium cameum (chart 24). 



?Pterogorgia gracilis (one small dead fragment). 



*Metridium dianthus (chart 25). 



Tealia crassicomis. 

 *Astrangia danse (chart 26). 



If we consider, with respect to their known ranges upon our coast, these 13 species 

 of coelenterates which were of most frequent occurrence in our dredge hauls, we may 

 group them as follows : 



Predominantly northern. 



Hydractinia echinata Greenland (Morch) to Charleston, S. C. (McCready). 



Eudendrium dispar Bay of Fundy to Vineyard Sound (Verrill). 



Halecium halecinum Gulf of St. Lawrence (Whiteaves) to Long Island Sound (Hargitt). 



Thuiaria argentea North Polar regions to Maryland (Nutting). 



Alcyonium cameum Gulf of St. LawTence (Whiteaves) to Rhode Island (Verrill). 



Metridiura dianthus Labrador to New Jersey (Verrill). 



Predominantly southern. 



Pennaria tiarella Maine to West Indies (Mayer). 



Schizotricha tenella Marthas Vineyard (Nutting) to Beaufort, N. C. (Fraser). 



Astrangia danse Cape Cod to Florida (Verrill). 



Having range of approximately equal extent north and south. 



Eudendrium ramosnm Labrador (Verrill) to Bermuda and Beaufort, N. C. (Hargitt). 



Obelia geniculata On our coast recorded from Labrador (Verrill) to Beaufort, N. C. 



(Fraser). [Cosmopolitan, according to Mayer.] 



Range of doubtful extent. 



Tubularia couthouyi Probably predominantly northern. 



Tubularia crocea Casco Bay (Hargitt) to Brooklyn, N. Y. (Verrill), and perhapsto 



Charleston, S. C. 



Thus six of these species appear to be predominantly northern in their range, while 

 only three are known to have a range which is predominantly southern. This is a 

 condition different from that shown by the local representatives of most of the phyla 

 of animals, which as a rule show a decidedly southern bias. We do not believe, 

 however, that this difference has any special significance, particularly since the propor- 

 tion of our coelenterates which are common to Canadian waters is no greater than that 

 for the fauna at large. 



With the exception of the two cases discussed above {Alcyonium and Astrangia), 

 none of these species appears to be distributed in relation to temperature in local waters. 



In the foregoing calculation we are of course only considering a few of the com- 

 monest bottom-dwelling species. Were we to include the multitude of pelagic forms 

 (Medusae), many of which are stragglers borne hither by the Gulf Stream, it is probable 

 that the ratio of northern to southern forms would be quite different. 



