46 AMERICAN HYDKOIDS. 



Campanularia flexuosa Weismann, Enatehung der Sexualzellen bei den Hydromedusen, 1883, p. 144. 

 Campanularia flexuosa Thallwitz, Ueber die Entwicklung der mannlichen Keimzellen bei den Hydroiden 1885 



p. 290. 

 Campanularia flexuosa Bourne, Hydi'oids of Plymouth, 1890, p. 394. 

 Campanularia flexuosa Marktanner-Turneketscher, Hydroiden des k. k. naturhistorisclien Hofmuseums, 1890, 



p. 205. 

 Laomedea (Obelia) flexuosa Levinsen, Annulata Hydroidse, etc., 1893, p. 368. 

 Campanularia flexuosa Crawford, Ann. Mag. Nat. Hist., ser. 6, vol. 16, 1895, p. 160. 

 Campanularia fl,exuosa Nutting, Notes on Plymouth hydroids, 1896, p. 147. 

 Campanularia flexuosa Hartlaub, Die Hydroiden Helgolands, 1897, p. 451. 

 Campanularia flex-uosa Bonnevie, Norwegian North Atlantic Exped., 1899, p. 71. 

 Campanularia flexuosa Nutting, Hydroids of the Woods Hole Region, 1900, p. 348. 

 Campanularia flexuosa Hargitt, Synopsis N. A. Invert., 1901, p. 385. 

 Campanularia flexuosa Billard, Contributions a I'etude des Hydroldes, 1904, p. 173. 

 Campanularia flexuosa Browne, Biscayan Plankton, Meduste, 1906, p. 171. 



Campanularia flexuosa Billard, Mission des Pecheries de la .Cote Occidentale d'Afrique, 1906, p. 73. 

 Campanularia flexuosa Jaderholm, Northern and Arctic Invert., pt. 4, Hydroiden, 1909, p. 68. 

 Laomedea flexuosa Broch, Die Hydroiden der arktischen Meere, 1909, p. 227. 

 Campanularia flexuosa Bedot, Hydroides de RoscoS, 1911, p. 219. 



Tro'phosome} — Colonies growing from an irregular mass of ascidian tests, worm tubes, etc. 

 Stems attaining an average height of about 3 cm., usually unbranched but not infrequently- 

 divided into two or more stragghng branches, each of which resembles the main stem. The 

 stem is flexuous, giving off alternate pedicels from the convex sides of the curves, and divided 

 into internodes each of which bears a pedicel on its distal end which appears to be a continu- 

 ation of the curved internode itself. There are a few, usually two to five, annulations at the 

 base of each internode. The pedicels are normally short, annulated throughout and decreas- 

 ing in size from proximal to distal end. They are ordinarily about as long as the hydrothecse. 

 The terminal hydrotheca is usually borne on a pedicel which is longer than the others and has 

 its median portion devoid of annulations and somewhat turgid. The hydrothecse are usually 

 typically campanulate in form but vary greatly in length, the outhne being sometimes almost 

 triangular but averaging about as described by L. Agassiz under name of Laomedea amphora, 

 about one-third longer than broad. The margin is entire, but often sinuous when viewed 

 from above. The diaphragm is well marked and the basal chamber large. The hydranths are 

 not present in the specimens described but are of the regular campanularian type with a trum- 

 pet-shaped hypostome and the tentacles are quite numerous, being from 24 to over 30 in num- 

 ber, and their bases are connected by a thin web as shown in plate 7, fig. 6. 



Gonosome. — The gonangia (female) are large, subcyUndrical, gradually tapering below 

 to a closely annulated short pedicel and abruptly truncated or squared off above. The gonan- 

 gium is 3 to 4 times as long as the hydrotheca and 4 to 5 times as long as broad. The ova are 

 thickly crowded around the blastostyle and develop into planuliB within the gonangium. The 

 walls of the gonangium are often irregularly wrinkled transversely and the upper part of the 

 gonangial cavity is often filled with a coenosarcal plug which sometimes has the form of an 

 inverted fuimel. The male gonangia are smaller, more slender, and their distal ends are often 

 narrowed into an imperfect neck. 



• Distribution. — American: New England Coast (Agassiz, Verrill, Nutting) . General: British 

 Islands (Hincks, Alder, Norman); Norway (Bonnevie); Iceland (Saemondsson) ; White Sea 

 (Schydlowsky) ; Denmark (Levinsen) ; Helgoland (Hartlaub) ; France (Billard) ; Mediterranean 

 (Pieper); Morocco (Billard). 



CAMPANULARIA NEGLECTA (Alder). 



Plate 8, figs. 1, 2. 



Laomedea neglecta Alder, Cat. Zooph. Northumb. and Durham, 1857, p. 33. 

 Laomedea neglecta Greene, A Manual of the Sub-Kingdom Coelenterata, 1861, p. 94. 

 Laomedea neglecta Hincks, Cat. Zooph. South Devon and Cornwall, 1861, p. 290. 



' Description of a specimen collected by the author at Plymouth, England. 



