64 AMERICAN HYDBOIDS. 



Key to American Species op Orthopyxis. 



Hydrothecal margin toothed, in typical specimens. 



Margin often everted, teeth not conspicuous everta. 



Margin not everted, teeth conspicuous crenata. 



Hydrotliecal margin smooth. 



Annulations of pedicels oblique, when present calindata. 



Annulations not oblique. 



Usually one globular distal annulation to pedicel compressa. 



Two to four annulations dytioides. 



ORTHOPYXIS CALICUXATA (Hincks) 

 Plate 15, fig. 4. 

 Campanularia caliculata Hincks, Ann. Mag. Nat. Hist., ser. 2, vol. 11, 1853, p. 178. 

 Campanularia caliculata Thompson, Ann. Mag. Nat. Hisfe, ser. 2, vol. 11, 1853, p. 443. 

 Campanularia caliculata Gosse, Manual Marine Zoology, vol. 1, 1855, p. 25. 



Campanularia caliculata M. Sars, Bidrag til Kundskaben om Middlehavets Littoral-Fauna, 1857, p. 158. 

 Campanularia brevicyphia Sars, Bidrag til Kundskaben om Middlehavets Littoral-Fauna, 1857, p. 158. 

 Campanularia caliculata Greene, A Manual of the Sub-kingdom Coelenterata, 1861, p. 44. 

 Clytia (Orthopyxis) poterium L. Agassiz, Cont. Nat. Hist. U. S., vol. 4, 1862, pp. 297, 355. 

 Campanularia caliculata Allman, Proc. Roy. Soc. Edinburgh, vol. 4, 1862, p. 64. 

 Laomedea caliculata Allman, Report on the present state of our knowledge of the reproductive system in the Hydroids, 



1864, p. 368. 

 Clytia poterium Allman, Report on the present state of our knowledge of the reproductive system in the Hydroids, 



1S64, p. 371. 

 Campanularia brevicyphia Allman, Ann. Mag. Nat. Hist., ser. 3, vol. 13, 1864, p. 372., 

 Laomedea poterium Allman, Ann. Mag. Nat. Hist., ser. 3, vol. 13, 1864, p. 373. 

 Laomedea caliculata Allman, Ann. Mag. Nat. Hist., ser. 3, vol. 13, 1864, p. 373. 

 Orthopyxis poterium A. Agassiz, North Amer. Acalephse, 1865, p. 223. 

 Orthopyxis poterium Hincks, British Hydroid Zoophytes, 1868, p. 164. 

 Laomedea {Clytia) poteriuvi Allman, Gymnoblastic Hydroids, 1871, p. 45. 

 Laomedea caliculata Allman, Gymnoblastic Hydroids, 1871, p. 48. 

 Campanularia caliculata Coughtry, Ann. Mag. Nat. Hist., ser. 4, vol. 17, 1876, p. 25. 

 Campanularia everta Clark, Trans. Conn. Acad, of Sci., vol. 3, 1876, p. 253. 

 Campanularia caliculata Verrill, Check-list of Marine Invert., 1879, p. 16. 

 Campanularia caliculata Jickeli, Der Ban der Hydroidpolypen, pt. 2, 1883, p. 631. 



Campanularia caliculata Bale, On some new and rare Hydroids in the Australian Museum Collection, 1888, p. 755. 

 Campanularia caliculata Marktanner-Turneretscher, Hydroiden des k. k. naturhist. Hofmuseums, 1890, p. 204. 

 Campanularia caliculata Fewkes, Guide to collectors, 1891, p. 37. 

 Campanularia Integra Levinsen, Meduser, Ctenophorer og Hydroider, 1893, p. 26. 

 Campanularia caliculata Bonnevie, Norwegian N. A. Bxped., 1897, p. 72. 



Agastra mira (medusa) Hartlatjb, Wissen. Meeresuntersuch. Meere Kiel, Helgoland, new ser., vol. 2, 1897, p. 504. 

 Campanularia caliculata (medusa) Giard, Comp. Rend. Soc. Biol., Paris, ser. 10, vol. 5, 1898, p. 17. 

 Campanularia caliculata Calkins, Some Hydroids from Puget Sound, 1899, p. 351. 

 Campanularia poterium Nutting, Hydroids of Woods Hole Region, 1901, p. 344. 

 Campanularia caliculata Hartlaub, H}fdroiden aus den Stillen Ocean, 1901, p. 353. 

 Campanularia caliculata Hargitt, Synopsis N. A. Invert., 1901, p. 383. 

 Campanularia caliculata Jaderholm, Aussereuropaische Hydroiden, 1905, p. 265. 



Campanularia everta Hartlaub, Die Hydroiden du magalhaensischen Region und chilenischen Kiiste, 1905, p. 560. 

 Campanularia caliculata Urocs, Nordsee-Hydroiden, 1905, p. 10. 



Campanularia caliculata Ritchie, Hydroids from the Cape Verde Islands, 1907, p. 503. 

 Campanularia caliculata Broch, Hydroiduntersuchimgen, I, 1908, p. 31. 



Campanularia integra (part) Jaderholm, Northern & Arctic Invert., pt. 4, Hydroiden, 1909, p. 65. 

 Campanularia integra (part) Brock, Hydroiden der arktischen Meere, 1909, p. 185. 

 Eucopella caliculata Fraser, West Coast Hydroids, 1911, p. 36. 

 Campanularia caliculata Stechow, Hydroiden der Miinchener Zoologischen Staatssammlung, 1912, p. 357. 



TrofTiosome} — Colonies consisting of numerous unbranched pedicels springing from a 

 creeping rootstock wliich is tortious, but not regularly annulated, and very tliick-waUed; the 

 cliitinous walls of the tubular rootstocks often being thicker than the liunen of the tube itself. 

 The pedicels also are very thick-wailed and spring at irregular distances from the rootstock. The 

 pedicels and hydrotheca combined attain a height of as much as 5 mm. Pedicels sometimes 

 closely annulated throughout, sometimes merely wavy and rarely almost smooth. In all cases 



' Specimen from Yakutat, Alaska, collected by the Harriman Alaska Expedition. 



