THE CAMPANTJLAKIDjE AND THE BONNEVIELLID^. • 91 



with a globular amiulation just below the hydrotheca and several other annulations below this. 

 There are also a number of irregular annulations at the proximal end, leaving a considerable 

 portion of the pedicel bare. Hydrothecse regularly campanulate, not bilaterally symmetrical 

 as in other Silicidarise, margin smooth, cahcular walls extensively thickened, especially on 

 lower parts, much as in Eucopella caliculata. 



Gonosome. — Gonangia (female) long, slender, gradually increasing in size to the truncated 

 distal end. According to Hartlaub, these are immature forms, the older ones being longer and 

 tapering at each end. The gonangia are borne on distinct pedicels of considerable length which 

 are irregularly annulated or wavy throughout. 



Locality. — The type material was collected by von den Steinen in South Georgia at ebb. 

 tide under stones. 



The character of the gonosome indicates that this is a Silicularia. In other respects it is a 



Eucopella. 



SILICDXARIA ROSEA Meyen.' 



Plate 25, fig^. 1-2. 



Silicularia rosea Meyen, tjber das Leuchten des Meeres, 1834, p. 204. 



Rypanthea georgiana Pfeffer, Jahrb. wiss. Anst. Hamburg, vol. 6, pt. 2, 1888, p. 54. 



Hypanihea aggregata Allman, Challenger Reports, Hydroida, 1888, p. 26. 



Silicularia rosea Hartlaub, Die Hydroiden der magalhaensischen Region und chilenischen Kiiste, 1905, p. 572. 



Silicularia rosea Jaderholm, Hydroiden aiis antarktiscben imd subantarktischen Meeren, 1905, p. 17. 



Trojylwsome.^ — The rootstocks consist of thick closely apphed parallel strands, from which 

 sprmg slender stalked hydranths and female gonophores, the latter often thickly aggregated. 

 The pedicels of the hydi'othecse considerably overtop the gonangia, are thinner than the root- 

 stock, thick-walled, entirely smooth, joined basally to the rootstock by a conical termination; 

 at their distal end, below the globular annulation separating them from the hydjothecse, some- 

 what thickened. Hydrothecse are sometimes slender, sometimes short and thick-walled, bilat- 

 erally symmetrical and with a very constricted hydrothecal cavity. 



Gonosome. — The female gonangia are tubular, relatively small, short, plainly pediceled, 

 and also with conical basal terminations. They are sometimes feebly curved, sometimes straight, 

 their lateral outlme sometimes sHghtly turgid. The extensive thickening of their walls extends 

 from the rounded distal ends to their basal termmations. 



Male gonophores very long and slender (specimens from South Georgia). 



Distribution. — South Georgia on Macrocystis gigantica (van den Steinen), South Africa 

 and near Cape Horn (Meyen). 



SILICULARIA RETICULATA (Hartlaub). 



Plate 25, figs. 3-4. 



Eucopella reticulata Hartlaub, Die Hydroiden der magalhaensiscben Region und cbilenischen Kiiste, 1905, p. 569. 



TropJwsome.^ — Kootstocks fornung an open irregular mesh of creeping fibers which are 

 much thicker than the pedicels. Pedicels smooth, about 6 mm. high, somewhat thickened 

 distaily and abruptly constricted at their basal insertion. Immediately below the hydrotheca 

 is a globular annulation of considerable size. Hydrothecse bilaterally symmetrical, very vari- 

 able in form, foreshortened m length, with the lateral outline lower on one side. 



Gonosome. — Gonangia (female) strongly compressed, rounded distaily, horn-shaped in out- 

 line, with short pedicel, short and broad, thick-walled only proximally and ia the pedicel. 



Locality. — Fomid on a smooth-leaved laminarian at Port Wilhams, Falkland Island. 



It seems to the present writer that this species should go into the genus Silicularia, with 

 which it agrees in nearly aU generic characteristics, until an examination of suitable material 

 shows the character of the gonangial contents. 



^No specimen of this species being available, the description is taken from Hartlaub 's notes on the type specimen, 

 found in the Berlin Museum (Die Hydroiden der magalhaensischen Region und chilenischen Kuste, 1905, p. 573). 

 2 Description taken from that of the original describer, Hartlaub, there being no material accessible to the writer. 



