THE CAMPANULAEID^ AND THE BONNEVIELLID^. 77 



with a slight shoulder at the distal end of each internode and 3 or 4 annulations above each 

 shoulder. Pedicels alternate, borne on the "shoulders" referred to, longer than the hydrothecse 

 and annulated tliroughout. Hydrothecas small, exceedingly dehcate in structure, varying con- 

 siderably in shape, being sometimes campanulate and sometimes triangular in outhne, margin 

 entire, diaphragm very low and indistinct. 



Gonosmne. — Gonangia borne in the axils of the pedicels, elongate obconical in shape, with 

 a wide terminal aperture surmounting a broad, conspicuous collar. They vary greatly in size, 

 being from twice to four times the length of the liydrotheca?. Contents, developing medusas 

 of the Ohelia type. 



Distribution. — The type-locality is 10 miles north of Zoblos Island. Reported from Ber- 

 mudas (Congdon) ; Woods Hole, Massachusetts (Hargitt) ; Beaufort, North Carohna (Eraser) . The 

 species is also reported from Ceylon (Thornley) ; West Indies (Versluys) ; Eastern Atlantic, Gulf 

 of Cadiz, Morocco, and Azores (Bdlard); and Fingal, 130 meters (Pictet and Bedot). 



Bathymetric distribution, 1 to 68 fathoms. 



OBELIA BRAZILIENSIS (Meyen). 



Plate 18, figa. 8, 9. 



Campanularia braziliensis Meyen, Uber das Leuchten des Meeres, 1834, p. 198, pi. 32, fig. 5. 



Obelia braziliensis Hartlaub, Die Hydroiden der magalhaensischen Region und chilenischen Kiiste, 1905, p. 581. 



The writer has not seen this species, and presents the following description, which is taken 

 partly from the original description of Meyen and partly from his figures: 



Trophosome.— Colony small and delicate, growing from a creeping rootstock on floating sea weed. Stem not 

 fascicled, geniculate, bearing usually alternate branclilets or pedicels and usually with 3 annulations just above the 

 origins of branchlets or pedicels. Pedicels long, with 2 or 3 distal annulations and a group of 3 to 5 at the proximal end. 

 Hydrothecee regularly campanulate, usually deeper than wide and with an even margin. Hydranth with about 16 

 tentacles. 



Gonosome. — Gonangia borne in the axils of branchlets and pedicels, elongate ovate in shape, more than twice as 

 long as broad, and ending distally in a round aperture which is slightly elevated on a sloping neck which passes insen- 

 sibly into the shoulderlike distal end of the body of the gonangium. In the specimen figured there is an annular con- 

 striction about one-third the way up the gonangial wall. 



I have seen no account of the gonangial contents. Hartlaub places it in the genus Obelia, 

 and it is therefore probable that medusse have been demonstrated. 



Distribution. — Found growing profusely on floating sea weed, especially on Fucus, off the 

 Brazilian coast (Meyen) . 



OBELIA DUBIA Nutting. 



Plate 19, fig. 1. 



Obelia dubia Nutting, Hydroids of the Harriman Alaska Exped., 1901, p. 174. 



Obelia dichotoma (part) Hartlaub, Die Hydroiden der magaUiaensischen Region und chdenischen Kiiste, 1905, p. 580. 

 Obelia dubia {=Obelia dichotoma Hincks) Mayer, Medusae of the World, vol. 2, the Hydromedusse, 1910, p. 248. 

 Obelia dubia Phaser, West Coast Hydroids, 1911, p. 39. 



TropTiosome.^ — Colony attaining a height of about 3-4 inches; stem sparingly branched, the 

 main stem and larger branches sinuous or slightly geniculate, giving forth pedicels singly or in 

 opposite pairs at the bends. Pedicels rather long and annulated tliroughout, the stem also more 

 extensively annulated than in most species of the genus. HydrothecEe large, tubular, with very 

 shallow undulations around the margin, from between which lines run down for a short distance 

 on the surface of the hydrothecfe. 



Gonosome. — Unknown. 



Distribution. — Orca, Alaska (Harriman Alaska Expedition) . Puget Sound specimen from 

 Kincaid. Hartlaub ^ may be right in considering this species as 0. (^icAotoma, but the present 

 writer preferso t retain it on the strength of the more tubular hydrothecse and much larger 

 pedicels of the Alaskan form. 



' As the writer has no specimen of this species at hand, the description is copied from his original description of 

 this form. 



2 Die Hydroiden der magalhaensischen Region und chilenischen Kuste, 1905, p. 580. 



55968°— 15 6 



