THE CAMPANULAEIDiE AND THE BONNEVIELLIDiE. 41 



In the specimen before me but a single fragment of a branch is present from which three hydro- 

 thecee arise from one side, although Allman describes them as alternate. The branch does 

 not show any division into internodes. The hydro thecse are very large (3.5 mm. in height by 

 1 mm. in diameter), tubular, with a gracefully everted margin which is very distinctly and 

 beautifully crenulated, there being about 14 crenulations, although Allm an gives but eight. 

 These crenulations correspond to a series of longitudinal flutings of the hydrothecal walls 

 which extend downward almost to the base. In two of the three hydrothecse the margins 

 are reduphcated, making a very beautiful ornamentation. 



I am unable to detect any true diaphragm, although there is a sharp constriction which 

 divides the hydrothecal cavity from that of the pedicel. The pedicel itself is very short, not 

 more than one-fourth as long as the hydrotheca, and bears a constriction at each end, being other- 

 wise smooth. 



Gonosome . — Unknown . 



The coenosarc of the branch of the remaining portions of the hydranth is of a reddish 

 chocolate-brown color. 



Distribution. — The type is from off Heard Island, lat. 52° 4' S.; long. 71° 22' E. Depth 

 150 fathoms. 



The only other locahty that I have seen reported for this species is the one given by 

 Jaderhohn for the specimen described, i. e., Burdwood Bank, Falkland Islands. 



At first sight this species closely resembles C. speciosa Clark, but it has very much larger 

 hydrothecas and an entirely different habit of growth. Until the gonosome is found the genus 

 to which this form should be referred must be in doubt. 



? CAMPANULARIA TINCTA Hincks 



Plate 4, figs. 6, 7. 



Campanularia tincta Hincks, Ann. Mag. Nat. Hist., ser. 3, vol. 5, 1861, p. 280. 



Campanularia tincta Bale, Australian Hydroid Zoophytes, 1884, p. 57. 



Campanularia tincta Hartlaub, Die Hydroiden der magalhaeiisischeii Region und chUenischen Kuate, 1905, p. 557. 



Campanularia tincta Jaderholm, Schwedischen Sudpolar-Exped., Hydroiden, 1905, p. 14. 



TropJiosome} — Colony parasitic on a sertularian hydroid and consisting of a creeping root- 

 stock, the surface of which is smooth although the rootstock itself is undulating in its course. 



The pedicels are usually shorter than the hydrothecse, although they are longer in speci- 

 mens described by the authors cited and in the figure (pi. 4, figs. 6, 7) which was taken from 

 a specimen kindly loaned by Doctor Hartlaub. The pedicels are irregularly ringed through- 

 out. Hy'drothecse tubular, deep, the sides being approximately parallel, the walls very thick 

 and rigid and the margin surrounded by about 10 sharp thorny teeth. The diaphragm is so 

 near the bottom of the hydrotheca as to make the basal chamber appear as the distal annu- 

 lation of the pedicel. There are well-marked pleats or ridges extending downward from the 

 teeth to beyond the middle of the hydrotheca. 



Gonosome. — Gonangia very large, ha\dng the general shape of a flattened cylinder; surface 

 smooth in general, with indistinct annular rugosities sometimes showing particularly on the 

 proximal part. The distal end is truncated with a wide opening, the margin of which is some- 

 times sunken below the general level of the end of the gonangium. The gonangial contents 

 were not sufficiently well preserved for identification. 



Distribution. — The type-locality is Austraha, Falkland Islands, and Port Stanley, South 

 America (Hartlaub). Bale reports it from Port Philip and Portland, Australia. 



This species is evidently closely alUed to 0. cylindrica Allman, as Hartlaub shows in his 

 figures. The specimen described is nearest, however, C. tincta of Hincks. 



1 Description of specimen from station 2776, Straits of Magellan, 21 fathoms. 



