THE CAMPANULAKID^ AND THE BONNBVIELLm^. 65 ■ 



they bear one or more annulations at the top and bottom, the former showing a spherical annu- 

 lation just beneath the hydrotheca, as in C. Integra. The hydrothecse vary greatly in shape and 

 in thickness of walls. In some cases they seem identical with those of G. Integra, being longer 

 than broad and thin-walled, compared with typical hydrothecse of G. caliculata. The walls, 

 however, are never as thin in my specimens as they are in typical G. Integra. All intergrada- 

 tions are foimd between the form just described and calyces which are broader than long with 

 their walls enormously tliickened so as to present the appearance which led Hincks in his original 

 description to describe them as " campanulate, having an interior cup."^ These hydrothecse 

 are sometimes broader than long. In all cases the walls are thickened near the bottom, forming 

 an annular sheH upon which the hydranth rests. The hydranth is of the regular campanularian 

 type. 



Gonosome.' — Gonangia elongate oval with the distal end truncated and the proximal end 

 passing gradually into a short peduncle. The walls are coarsely and unevenly corrugated, the 

 corrugations being shallow. The gonangia often show internal longitudinal bands, typically 

 four in number. These canals are branched, accordmg to Hincks. The medusa is the Agastra 

 mira of Hartlaub, according to Giard, and is described by Mayer as follows:. 



Bell somewhat higher than wide, 1 mm. high, with scattered isolated nematocysts over exumbrella. Gelatinous 

 substance quite thick and of equal thickness everywhere except at the apex, where there is a deep, narrow, funnel- 

 shaped depression. No tentacles, but 4 minute, pigmented bulbs. 8 adradial hthocysts, each with a single concretion. 

 4 narrow radial-canals and a ring-canal. No stomach, the radial-canals either ending blindly at inner apex of bell-cavity 

 or fusing at one point at this place. The gonads are elongate, irregularly arranged, sac-shaped evaginations upon both 

 sides of the middle parts of each radial-canal.' 



Distribution. — North American : Labrador (Hincks) ; New England Coasts (Verrill) ; Davis 

 Straits (Levinsen); Cahfornia Coast (Torrey); Alaska (Nutting); Puget Sound (Calkins); Bering 

 Sea (Jaderholm). General: Norway (Bonnevie); Arctic Sea (Broch); Greenland (Levinsen); 

 Iceland (Saemondsson) ; Spitzbergen (Marktanner-Turneretscher) ; Sweden (Jaderhohn) ; 

 British Coasts (Hincks, Allman) ; Mediterranean (Sars) ; New Zealand (Coughtry) ; Japan 

 (Inaba); Africa, Port Natal (Billard); Patagonia (Jaderholm); Magellan Straits and Chile 

 (Hartlaub); Australia (Bale). Bathymetric distribution, 1 to 100 fathoms. 



This appears to be one of the most cosmopoHtan of the Campanularidse. 



ORTHOPYXIS COMPRESSA (Clark). 



Plate 15, figs. 5-10. 



Cumpanularia compressa Clark, Proc. Acad. Nat. Sci. Philadelphia, 1876, p. 214. 



Campanularia caliculata Calkins, Hydroids from Puget Sound, 1899, p. 351. 



Clytia compressa Nutting, Hydroids of the Harriman Alaska Exped., 1901, p. 170. 



Clytia compressa Torrey, Hydroida of the Pacific Coast, 1902, p. 58. 



Clytia compressa Toeeey, Hydroids of the San Diego Region, 1904, p. 17. 



Campanularia comjjrcssa Hartlaub, Die Hydro iden der magalhsensischen Region und chilenischen Kiiste, 1905, p. 562. 



Campanularia compressa Jaderholm, Hydroiden aus antarktischen und subantarktischen Meeren, 1905, p. 14. 



Campanularia integra (part) Jaderholm, Northern and Arctic Invert., pt. 4, Hydroiden, 1909, p. 65. 



Campanularia compressa Feasee, West Coast-Hydroids, 1911, p. 37. 



TropJiosome.^ — Colony consisting of unbranched pedicels springing from a creeping root- 

 stock. Pedicels and rootstocks not regularly annulated, but with greatly thickened perisarc. 

 Pedicels sometimes attaining a height of 6 mm., smooth with usually a globular annulation just 

 below the hydrotheca. Hydrothecse sometimes without greatly tliickened walls and triangular 

 in shape. Others have excessively thickened walls, so that the o\ithne becomes ovoid, the inner 



1 Ann. Mag. Nat. Hist., ser. 2, vol. 11, 1853, p. 178. 



^Not present in specimen described. The present description is based on the figures given by L. Agassiz (under 

 name of Clytia poterium) in Cont. Nat. Hist. U. S., vol. 4, 1862, pi. 18. 

 'Medusse of the world, vol. 2, the Hydromedusse, 1910, p. 234. 

 ■* Specimen from Orca, Alaska, collected by the Harriman Alaska Expedition. 



