THE CAMPANULAEID^ AND THE BONNBVIELLID^. 59 



Trophosome. — Hydrocaulus attaining a height of nearly an inch, fascicled below, alternately branched; main stem 

 annulated for a short distance above each ramulus; ramuli annulated at their origin; hydrothecal peduncles of moderate 

 length, more or less annulated. Hydrothecae narrow, deep, nearly cylindrical above, and then tapering towards the 

 base; the orifice cut into about twenty acute, deep, narrow teeth. 



Gonosome. — ^According to the description and figure of Pictet' the gonangia are obconic 

 with smooth walls, about as long as the hydrothecse, and the blastostyle bears two opposite 

 rows of bell-shaped medusae. 



Type-locality. — Off Florida Reef, 90 fathoms, specimens found attached to Halecium 

 macrocepJialum (Allman).. Found also by Pictet in the Port of Amboma, 1 meter, and by Billard, 

 south of Gulf of Cadiz, 60 meters, and off Cape Spartel, Morocco, 112 meters. 



A specimen that is referred with considerable doubt to this species is figured on plate 12, 

 fig. 5. It is evidently a young colony with an unfascicled stem. It greatly resembles O.longi- 

 cyatha in mode of branching, annulations, pedicels, and shape of hydrothecse. The latter, how- 

 ever, are shghtly stouter than in longicyatha, and have the rim ornamented with 12 to 14 sharply 

 pointed teeth corresponding to an equal number of longitudmal ridges which occupy about the 

 upper third of the hydrothecal margin, thus giving a regularly pleated appearance resembling 

 that of Oielia hicuspidata. The original describer of C. longicyatha mentions the fact that it is 

 "a very delicate species, with the hydrothecse thin and compressible." The thin texture 

 of the hydrothecal wall may allow of its being thrown into folds or pleats when the hydro- 

 thecse are absent or retracted and thus to present the appearance shown in plate 12, fig. 5. 



This specimen was secured by the Bahama Expedition of the State University of Iowa, 

 from off Key West at a depth of 5^ fathoms. It was growing on a colony of Idia pristis. 



Dr. C. M. Fraser also found this species at Beaufort, North Carolina, on floating gulf weed. 



CLYTU BAKER! Torrey. 



Plate 13, figs. 1, 2. 



Clytia bakeri Torrey, Hydroids of the San Diego Region, 1904, p. 16. 

 Clytia baken Torret, Univ. 'of Calif. Publications, Zool., vol. 2, 1906, p. 323. 

 Phialium baked Torhey, Univ. of Calif. Publications, Zool., vol. 6, 1909, p. 21. 

 Clytia bakeri Mayer, Medusae of the World, vol. 2, The Hydromedusse, 1910, p. 262. 

 Eucheilota bakei-i Mayer, Medusae of the World, vol. 2, The Hydromedusae, 1910, p. 495. 

 Clytia bakeri Fkaser, West Coast Hydroids, 1911, p. 34. 



TropTwsome.^ — Colony consisting of a number of erect stems arising from a creeping root- 

 stock on a hving Donax. Stems about 1 cm. high, usually unbranched, the basal portion being 

 regularly annulated, the annulations resembling segments. Higher up these annulations 

 decrease in number and thi'oughout the distal part of the stem there is a fairly regular series 

 of internodes, each bearing a pedicel on a sort of shoulder projecting from its distal end. 

 Throughout this portion the stem is shghtly flexuose. The pedicels are very short, always 

 shorter than the hydrothecse. Ordinarily they have a single discoid or globular annulation 

 just below the hydrotheca, and, in the nonproximal parts of the stems, there are two or even 

 three such annulated pedicels. The hydrothecse are triangular in outhne with a smooth rim, 

 or at least without regular teeth. There is a well marked thick diaphragm which restricts 

 the passage of the coenosarc from hydranth to stem to a very small aperture. The hydranth has 

 a trumpet-shaped proboscis and about 20 tentacles. 



Gonosome. — The gonangia are borne on the front and back of the stem, sometimes singly 

 and sometimes in opposite pairs. They are long, rather slei;der, with the distal end truncated 

 and much the largest and gradually diminishing in size from distal end to base. They are 

 almost sessile, being joined to the stem by a very short pedicel. My specimens do not show 

 the "bottle-nosed" apertures described by Torrey, but the entire end seems to be covered 



' Hydraires d'Amboine, 1893, p. 28. 



2 Description of specimens collected by the writer on "Long Beach" near La Jolla, California, growing on shells 

 of living Donax. 



