50 AMERICAN HVDBOIDS. 



Gonosome.- — Gonangia borne on the stems, being ordinarily inserted in the axils of the 

 pedicels and sometimes apparently on the basal portion of the pedicel rather than on the stem 

 proper. They are of unique shape, being oblong-ovate in general form but with part of the 

 laterodistal portion excavated and apparently introverted, producing a curved tube with hori- 

 zontally striated walls and with a round aperture at its inner, and a crescent-shaped opening 

 at its outer end. The contents of the gonangium are a blastostyle and ova in various stages 

 of development up to and including fully formed planulse. These structures are all inclosed 

 in a delicate sack-like membrane which seems to open into the round inner aperture of the 

 tube described above. 



Distribution. — The type-locality is Salcombe Bay, southwest coast of England. It has 

 also been reported from the New England coast by Clark, Nutting, Hargitt, and Fraser. 



CAMPANDLARIA AMPHORA (L. Agassiz). 



Plate 9, figs. 5-7. 



Laomedea amphora Agassiz, L., Cont. Nat. Hist, of U. S., vol. 4, 1862, p. 311, pi. 30, figs. 13-18. 



Campanularia amphora Agassiz, A., The acalephan fauna of the Southern Coast of Mass., Proc. Boston Sac. Nat. Hist., 



vol. 8, 1862, p. 224. 

 Campanularia amphora Allman, Construction and Limitation of Genera among the Hydroids, Ann. Mag. Nat. Hist., 



ser. 3, vol. 13, 1864, p. 345. 

 Campanulai-ia amphora Clark, Mind in Nature, 1865, p. 284. 



Campanularia amphora Hincks, Zoophytes, Quart. Joum. Sci., vol. 2, 1865, p. 401. 

 Laomedea amphora Fewkes, Embryological Monographs, vol. 3, 1884, pi. 3, figs. 17 and 18. 

 Campanularia amphora Nutting, Hydroids of the Woods Hole Region, 1901, p. 347. 



Trophosome.^ — Colony 15 cm. in height, main stem simple but so covered with parasitic- 

 growth that its details can not be made out. Branches given off on all sides of the main stem, 

 but not regularly. There are groups of annulations above each branch origin and the branches 

 often subdivide into branchlets which tend to be lateral and alternate in position and bear 

 groups of annulations above each branchlet and pedicel origin. The pedicels are alternately 

 disposed in general (but this is often interfered wdth by an irregular distribution) and are usually 

 annulated throughout and much shorter than the hydrothecse. The pedicels bearing distal 

 hydrothecse are often much longer, sometimes several times as long, as the hydrothecae, and 

 the median portion bulges distinctly on one side. The hydrothecje are d'b<eply campanulate, 

 with an even rim, and are often 1 .5 times as long as broad. The diaphragm is well defined and 

 the basal chamber moderately deep. The hydranth has from 24 to 28 tentacles. 



Gonosome.^ — The gonangia (female) is a lengthened oval truncated at the top and bearing 

 developing ova on all sides of the blastostyle. Male gonangia much more slender, terete in 

 form, with a narrow terminal aperture. 



Distrihution. — Type-locality, Massachusetts Bay. Found also at numerous points on the 

 coast from Grand Manan, New Brunswick, to Newport, Rhode Island. It has not been reported 

 outside of this region. 



? CAMPANULARIA RIGIDA (A. Agassiz). 



Laomedea rigida Agassiz, A., North Amer. Acalephee, 1865, p. 93. 

 Campanularia rigida Clark, Hydroids of the Pacific Coast, 1876, p. 251. 

 Campanularia rigida Torrey, Hydroida of the Pacific Coast, 1902, p. 11. 

 Campanularia rigida Phaser, West Coast Hydroids, 1911, p. 32. 



This species has never received adequate description, neither has it been figured. It is 

 quite probable that it is identical with some species more recently described, e. g., Clytia laken 

 Torrey, but this cannot be demonstrated. The following is the original description: 



This species is remarkable for its peculiar mode of growth. At first glance it would readily be mistaken for a species 

 of Dynamena, so regular is the succession of the hydrae along the stem, and also on account of the absence of branches. 



' Description of a specimen collected by Vinal Edwards from New Bedford wharf. 



^ Not present in the specimen described. The above description is gleaned from Agassiz's figures, Contributions to 

 Nat. Hist, of United Sta,tes, vol. 4, 1862, pi. .30, figs. 13-18. 



