10 



HJALMAR BROCH. 



[REP. OF THE "MICHAEL SARS" NORTH 



und ganz wie bei Silicularia bilateral symmetrisch sein 

 kann." In fact the first radially symmetrical species which 

 has been referred to Eucopella is Eucopclla crenata Hart- 

 laub, and this species has been placed in the genus 

 Eucopella on account of its unknown medusa. 



We can find no better illustration of the impossibility 

 of basing a hydroid-system on the gonophores than this. 

 In the same admirable paper by Hartlaub (1. c. p. 556) 

 he says about Clytia Johnsioni that "fur ihr Vorkommen 

 in der magalhaensischen Region sprechen die von Browne 

 fur die Falklands-Inseln beschriebenen Quallen-Genera 

 Phialidium und Phialella." In Eucopella crenata we have 

 another species of Campanularia which has been separated 

 from its allies because it produces a hitherto unknown 

 medusa; it has even been transferred to a genus which 

 must be referred to the Siliculariidae, as it has bilaterally 

 symmetrical hydrothecae, a fact hitherto not mentioned 

 in the generic diagnosis. Probably the hydrothecae of 

 the species of Eucopella may show the same microsco- 

 pical structure as other Siliculariids and different from that 

 of the Campanulariids. 



Campanularia Johnstoni Alder. 



South of the Azores (Stat. 51) common on floating 

 sea-weed, with gonangia; Sargasso sea (Stat. 67) many 

 fertile colonies growing on floating sea-weed. 



At Stat. 51 interesting variations were observed in 

 the gonangia; the gonothecae of the same colony may 

 be annulated or almost smooth. In the same colony the 

 marginal teeth of the hydrotheca may often vary from the 

 typical pointed ones to the rounded teeth described by 

 Nutting 1 ) from Woods Hole ("Clytia Grayi") ; the number 

 of marginal teeth may vary greatly. 



Campanularia simplex (Congdon) 



Sargasso sea (Stat. 67), a few fertile colonies growing 

 on floating sea-weed. 



This species is no doubt identical with the variety 

 of Campanularia volubilis described by Marktanner- 

 Turneretscher. 2 ) The specimens doubtfully identified by 

 BiLLARD 3 ) as Eucopella crenata must also be referred to 

 this species. Billard was in doubt as to their identity, 

 because the gonangia were wanting; the gonangia indeed 

 show that the specimens from the Atlantic Sargassum and 

 Campanularia crenata Hartlaub are specifically different. 



The rather long and strongly built stalks of the hydro- 

 thecae arise from creeping stolons; they are annulated at 

 the base and under the hydrothecae, but the annulation 



generally disappears in the middle parts of the stalks. 

 The rather thick-walled hydrotheca is obconical, or rather 

 tubular, with a regularly crenulated margin. The length 

 of the hydrotheca is about 0-5 mm. The gonothecae are 

 very characteristic (fig. 12); they are almost at right angles 



Fig. 12. Campanularia simplex from floating sea-weed 

 at Stat. 67. a: Gonangium seen from above (X 40). 



to their very short stalks. The side next to the stolons 

 is quite flattened, but the opposite side is strongly arched, 

 and the gonangia thus closely resemble scale insects. 

 Seen from above (fig. 12, a) they show an irregularly ovate 

 contour, with a rather large distal aperture. The contents 

 seem to consist of gonophores, which are liberated as 

 free medusae. 



Campanularia Hincksi Alder. 



Near Cape Bojador (Stat. 37) some small sterile colo- 

 nies were found growing on Aglaophenia tubuliformis, 

 Nemertesia ramosa and N. Hartlaubi from 39 metres. 



Campanularia (?) mutabilis Ritchie. 



Near Cape Bojador (Stat. 37) in 39 metres a few 

 hydrothecae growing on sea-weed. 



This species was first described by Ritchie 4 ) from the 

 Cape Verde Islands and the "Michael Sars" specimens (fig. 

 13; present only slight and unimportant differences from 



*) The Hydroids of the Woods Hole Region (U. S. Fish Commiss. Bull, for 1899). Washington 1901, p. 344. 



2 ) Die Hydroiden des k. k. naturhistorischen Hofmuseums, p. 215, Taf. Ill, fig. 12. 



-) Hydroi'des. (Exped. scient. "Travailleur" et "Talisman"), p. 170. 



*) On collections of the Cape Verde Islands marine faune .... The Hydroids (Proc. Zool. Soc. London 1907), p. 504, pi. XXIII, figs. 3—5. 



