30 AMERICAN HYDEOIDS. 



Campanularia verticillata McIntosh, Ann. Mag. Nat. Hist., eer. 4, vol. 13, 1874, p. 208. 



Campanularia verlicillata Schulze, Nordsee Expedition, 1874, p. 129. 



Campanularia verticillata Verkill, Amer. Jom-. Sci., vol. 7, 1874, pp. 44, 413, 504. 



Campanularia verticillata Vekhill, Amer. Jour. Sci., vol. 10, 1875, p. 42. 



Campanularia circula Clark, Alaskan Hydroids, 1876, p. 213. 



Campanularia verticiltala Beroh, Goplepolyper fra Kara Havet, 1877, p. 333. 



Campanularia verticillata Mereschowsky, Ann. Mag, Nat. Hist., ser. 5, vol. 2, 1878, pp, 323, 333. 



Campanularia verlicillata Winther, Fortegnelse over de i Danmark og dets Nordligi Bilande funde Hydroide Zooph., 



1879-80, p. 238. 

 Campanularia verticillata Bonnevie, Kristine, Norwegian North Atlantic Exped., 1889, p. 71. 

 Campanularia verticillata Dreisch, Tektoiiische Studien, 1890, p. 217. 



Campanularia verticillata Marktanner-Turneretscher, Hydroiden des k. k. naturhist. Hofmuseums, 1890, p. 203. 

 Campanularia verticillata Levinsen, G. M. R., Meduser, Ctenophorer og Hydroider fra Gronlands Vestkyst, 1892, p. 24. 

 Campanularia verticillata Levinsen, G. M. R., Vid Udb. "Hauschs" Togter, 1893, p. 369. 

 Campanularia verticillata Crawford, Ann. Mag. Nat. Hist., ser. 6, vol. 16, 1895, p. 260. 

 Campanularia verticillata Marktanner-Turneeetscher, Hydroiden von Ost-Spitzbergen, 1895, p. 405. 

 Campanularia verticillata Hartlaub, Die Hydromedusen Helgolands, 1897, pp. 451, 488. 

 Campanularia verticillata Nutting, Hydroids of the Woods Hole Region, 1899, p. 347. 

 Campanularia verticillata Nutting, Hydroids of Harriman Alaska Expedition, 1899, p. 171. 

 Campanularia verticillata Hargitt, Synopsis of N. A. Invert., Amer. Nat., 1901, p. 384. 

 Campanularia fascia Tokrey, Hydroida of the Pacific Coast, 1902, p. 52. 

 Campanularia verticillata Billard, Contribution k V 6tude des Hydroides, 1904, p. 173. 

 Campanularia verticillata Broch, Nordsee Hydroiden, 1905, p. 12. 



Campanularia verticillata var. grandis Hickson and Gravely, National Antarctic Exped,, 1907, \i. 23, 

 Campanularia verticillata Jadeeholm, Zur Kenntnis der Hydroidenfauna des Beringsmeeres, 1907, p. 2. 

 Campanularia verticillata Hargitt, Notes on a few Coelenterates of Woods Hole, 1908, p, 112. 

 Campanularia verticillata Jaderholm, Die Hydroiden des Sibirischen Eismeeres, 1908, p, 11, 



Campanularia verticillata Billard, Revision des espfeces types d' Hydroides de la Collection Lamouroux, 1909, p. 311 . 

 Campanularia verticillata Jaderholm, Northern and Arctic Invert., IV, Hydroiden, 1909, p. 69. 

 Campanularia verticillata Broch, Die Hydroiden der arktischen Meere, 1909, p. 188. 

 Campanularia verticillata Eraser, C. M., West Coast Hydroids, 1911, p. 33. 

 Campanularia verticillata Kramp, Paul L., Report on Hydroids of Danish Exped. to Northeast Greenland, 1911, 



p. 393. 

 Campanularia verticillata Kramp, Paul L., Hydroids collected by the Tjalfe Exped. to the West Coast of Greenland, 



1913, p. 30. 



Trofhosome. — Colony erect, branched; stem and main branches polysiphonic' Colony 

 attaining a height of 14 inches, but usually considerably less. The pedicels originate in irreg- 

 ular whorls or verticels from the tubes of the polysiphonic stem and branches, there being 

 usually 5 to 9 pedicels in one of these irregular whorls. Whorls about 2 mm. apart, as a 

 rule ; but they become less regular and more approximated toward distal ends of the branches, 

 projecting at a wide angle from the stem or branch. A medium-sized branch consists of six 

 tubes and the verticils are usually composed of six pedicels, one from each tube. The pedicels 

 and hydrothecse together measure about 2.5 mm. Pedicels often anniilated throughout, but 

 the annulations are more distant on the median portion than near the end. Just below the 

 hydrothecee are two deep annular constrictions rather near together, resulting in a globular 

 appearance of the extreme distal end of the pedicel. The hydrothecse are broadly campanulate, 

 rather large and with rigid walls, the margin being ornamented with a regular series of usually 

 16 teeth which are more or less squared or truncated at the ends. There is a well-marked 

 thickening of the hydrothecal walls near the bottom which constricts the hydrothecal cavity 

 and forms a poorly differentiated basal chamber below the hydranth and has the effect of a 

 diaphragm, indeed constitutes one in the opinion of the present writer. 



Gonosome. — The gonangia are situated on the branches between the verticils of pedicels, 

 being thickly scattered on aU sides and more numerous than the pedicels in the specimen de- 

 scribed. They are flask-shaped with a narrowed somewhat tubular neck that is usually unsym- 

 metricaUy placed and ends in a round aperture. The gonangia are supported on short ped- 

 uncles and are, on the average, about half the length of the pedicels. They contain simple 

 blastostyles bearing simple sporosacs. 



' Hargitt (1908) has shown that there are connections of ccenosarc between the tubes. 



