THE CAMPANULARID^ AND THE BONNEVIELLID^. 85 



Gonosome} — "Gonothecse axillary, ovate, somewhat flattened at the top, with a short 

 tubular orifice, attached by a ringed stalk." Medusae with 24 tentacles at hberation. The 

 gonads are near the bases of the gastric pouches, as viewed from above.^ There are 8 lithocysts. 



Distribution. — Common in shallow water on British and Norwegian coasts. Also reported 

 from Denmark (Winther); Ochotsk (Hartlaub); Greenland (Levinsen); Helgoland (Hartlaub); 

 New England coast, North America (Verrill, Nutting) ; and from the east coast of South America 

 (Nutting). 



Bathymetric distribution, 1 to 25 fathoms. 



OBELIA BOREALIS Nutting. 



Plate 22, figs. 5-7. 



Ohelia horealis Nutting, Hydroids of the Harriman Alaska Exped., 1901, p. 174. 

 Obelia horealis Mayer, Medusse of the World, vol. 2, the Hydromedusse, 1910, p. 249. 

 Ohelia horealis Frasek, West Coast Hydroids, 1911, p. 38. 



TropTwsome.^ — Colony 23 cm. high. A short distance above its base it divides into two 

 subequal branches which are practically main stems. Main stems simple, although in places 

 branchlets may be intertwined with them. The branches are usually comparatively short and 

 irregularly arranged, opposite sometimes, but usually alternate, and sometimes tending to a 

 verticeUate arrangement. The branches are themselves divided into branchlets which often 

 give off pedicels in pairs or alternately, but usually in an irregular manner. The branches 

 with their ramifications tend to assume a flabellate form, and, as is usual in this genus, there are 

 groups of aimulations above each branch and pedicel origin. The pedicels are usually short and 

 annulated throughout, but when terminal are much longer than the hydrothecse and only the 

 ends are amiulated. Hydrothecse large, in the shape of elongated cones, the walls being but 

 slightly curved in profile. The margin is entire and the diaphi'agm well marked. 



Gonosome.* — Gonangia borne in the axils of the branches and branchlets; oblong ovate, 

 truncated above, having a collar in mature specimens; aperture apparently very large, pedicels 

 strongly annulated. The gonangia of the specimens examined were filled with developing 

 medusse of the regular Ohelia type. 



Distribution. — Type-locahty, Yakutat, Alaska. Also found at Bermg Island and Sitka, 

 Alaska (specimens from United States National Museum), Puget Sound (specimen from Prof. 

 Trevor Eancaid). A fijie specimen was collected by the U. S. R. S. Corwin, lat. 70° 15' 10" N.; 

 long. 162° 55' W. 



Bathymetric distribution, 1 to 10 fathoms. 



OBELIA LONGISSIMA (Pallas). 



Plate 23, figs. 1-3. 



Sertularia longissima Pallas, Elenchus Zoophytorum, 1766, p. 119. 

 Sertularia longissima Boddaert, in PaUas, Lyst der Plant-Dieren, 1768, p. 149. 

 Sertularia longissima Gronovius, Zoophylacium gronovianum, vol. 3, 1781, p. 857. 

 Sertularia longissima Oken, Lehrbuch der Naturgeschichte, vol. 3, 1815, p. 92. 

 Sertularia longissima Ehrenberg, Abh. Akad. Wissens. Berlin, 1832, 1834, p. 297. 

 Campanularia gelatinosa van Beneden, Memoire sur les campanulaires de le C6te d'Ostend, 1844, p. 33. 

 Laomedea dichotoma var B. Johnston, Hist. Brit. Zooph., 1847, p. 102. 

 Laomedea dichotoma var B. Gray, List Brit. Anim., 1848, p. 83. 



Laomedea dichotoma var B. Cocks, Contributions to the Fauna of Falmouth, 1849, p. 93. 

 Campanularia gelatinosa Krohn, Ueber Podocoryne carnea Sars, etc., 1851, p. 267. 



Campanularia gelatinosa Gegenbauer, Zur Lehre von Generationwechsel und der Fortpflanzung bei Medusen und 

 Polypen, 1854, p. 163. 



' Not present in the specimen described. The description given above is quoted from Hincks, British Hydroid 

 Zoophytes, 1868, p. 157. 



- Description of specimens kindly sent me by Doctor Hargitt, presumably from Woods Hole, Massachusetts. 



^ Description of a specimen from Bering Island. 



~ Description copied from the original description of the species. 



