34 AMBBICAN HYDEOIDS. 



Campanularia integra Clark, Alaskan Hydroids, 1876, p. 215. 



Campanularia integra Meeeschkowsky, Ann. Mag. Nat. Hist., ser. 5, vol. 2, 1878, p. 323. 



Campanularia integra Bergh, Goplepolyper fra Kara-Havet, 1887, p. 333. 



Campanularia integra (part) Levinsen, Meduser, Ctenophorer og Hydroider fra Gronlands Vestkyst, 1893, p. 26. 



Campanularia integra Hartlaub, Hydroiden aus den Stillen Ocean, 1901, p. 353. 



Campanularia integra Jaderholm, Hydroiden Schwed. Zool. Polar Exped., 1902, p. 9. 



Campanularia integra Jaderholm, Zur Kenntnis der Hydroiden fauna des Berings Meeres, 1907, p. 2. 



Campanularia integra Billard, Hydroides de Madagascar, 1907, p. 340. 



Campanularia integra Jaderholm, Die Hydroiden des Siberischen Eismeeres, 1908, p. 10. 



Campanularia integra Eraser, West Coast Hydroids, 1911, p. 31. 



Campanularia integra (part) Kramp, Report on Hydroids of the Danish Exped. to Northeast Greenland, 1911, p. 288. 



Campanularia integra (part) Kramp, Hydroids collected by the Tjalfe Exped. to the West Coast of Greenland, 1913, 



p. 28. 

 Campanularia integra Stechow, Hydroidpolypen der japanischen Ostkuste, pt. 2, 1913, p. 73. 



TrofTiosome} — Colony consisting of a creeping rootstock growing over a lamrnarian and 

 sending off numerous lateral offshoots which extend in all directions over the surface of the 

 plant. There are few, if any, regular annulations of the rootstock except where it branches. 

 The pedicels are upright and irregularly distributed, attaining a height, with the hydro theca, 

 of about 5 mm. The pedicels are slender, more or less annulated throughout, although the 

 annulations are unequally distributed and less closely set a short distance below the hydrothecse. 

 The annulations are often so obhque as to give a spiral effect. There is a globular annulation 

 just below the hydrotheca. The hydrothecse are broadly campanulate, usually flariag some- 

 what toward the margin. A typical one is about as high as wide at the margin. They vary 

 considerably even in the same colony, sometimes being more tubular and considerably longer 

 than wide. The margin is perfectly even and well defined and often reduphcated in the speci- 

 men described. The hydrothecal walls are thickened near the bottom, forming an internal 

 ridge or sheh on which the hydranth rests and hmiting an iU defined basal chamber. The 

 hydranths have the ordinary campanularian structure. 



Gonosome. — The gonangia are borne on the rootstocks, are oblong-oval in outline and regu- 

 larly and strongly aimulated; the annulations being obhque and imparting a spiral effect. 

 Margin circular, wide and smooth. Pedicels short and smooth. Sexual products borne on 

 fixed sporosacs. 



The writer can not agree with Levinsen, Jaderholm, and Broch, in combining C. caliculata 

 Hincks and C. integra MacgiUivray in one species under the name of the latter. While it is true 

 that an intergrading series of the hydrothecse may be found, especially in taking calyces in all 

 stages of growth (as in a large colony of C. caliculata where the thickening is largely a matter 

 of age), the gonangia of the two are so different that their identity can not be assumed without 

 a very serious stretch of the imagination. 



Broch, who discusses this matter at length,^ says that the gonangia of the two species 

 intergrade, but I have seen no iastance of the kind and, as the two may occur together, a very 

 careful dissection would be necessary to place the matter beyond doubt. In general the hydro- 

 thecse are noticeably smaller and thinner-walled in C. integra, and the gonangia more slender 

 and distinctly amiulated. It should be understood moreover that the present writer repudiates 

 the idea that occasional intergradation in these low forms is sufficient ground for uniting 

 species that are usually and perfectly distinguishable. 



Distribution. — American. Labrador (Hincks) ; New England Coast (Agassiz and Hargitt) ; 

 Alaska (Clark); Bermg Sea (Jaderholm); Puget Sound (Nutting); Albatross station 2975, lat. 

 34° 01' 30" N.; long. 119° 29' 00" W., 36 fathoms, off southern Cahfornia. 



General distribution. — Sweden (Jaderholm); Norway (Broch); Spitzbergen (Jaderholm); 

 White Sea (Schydlowsky) ; Arctic Sea (Bergh) ; Great Britain (Hincks and others) ; Mediterranean 

 (Sars); Cape Verde Islands (Ritchie); Port Natal (Billard); Austraha (Bale); New Zealand 

 (Farquhar) ; Patagonia (Jaderholm) ; Chile and Straits of Magellan (Hartlaub) ; Japan (Stechow). 



BatJiymetric distribution. — One to 100 fathoms. 



' Description of a specimen collected off Cape Ann by the United States Fish Commission. 

 - Die Hydroiden der arktische, Meere, 1909, p. 185, 



