43 o DISCOVERY REPORTS 



i.e. from the inrolled corner below the insertion of the spines (cf. B. calathus and 

 B. cucullata var. cuspidata). 



4. Bugula hyadesi Jullien. Fig. 38 D. 



Bugula hyadesi Jullien, 1888, p. 71, pi. vii, figs. 4-6; Calvet, 1904, p. 8. 

 ? Acamarchis brasiliensis d'Orbigny, 1841, pi. iii, figs. 5-8; 1847, p. 10. 

 Station distribution. Not represented in the Discovery collections. 



Geographical distribution. Magellanic Region (Jullien ; Calvet) ; Falkland Islands (34 .11.12.41 

 from Challenger St. 315); Rio de Janeiro? (d'Orbigny). 



A small specimen of this species found among unnamed material from Challenger 

 St. 315 has very small cap-shaped ovicells (Fig. 38 D). Such an ovicell is evidently 

 represented on one zooecium of the right-hand branch in Jullien 's fig. 5. 



Bugula hyadesi is distinguished from B. ditrupae (Fig. 38 F) by its less numerous 

 distal spines (2 : 1 instead of 3 or 4 : 2) ; by its reduced ovicells ; by its larger avicularia 

 which are attached more proximally and have a more acute upper head-angle (see p. 396) 

 and an almost rectangular lower head-angle ; by its more delicate colony, with bifurca- 

 tions of type 3, those of B. ditrupae being of type 5. 



B. hyadesi appears to be related to B. turrita (see Fig. 38 E, and Osburn, 1912, p. 225) 

 with which it agrees in the general shape of its zooecia and in its method of bifurcation. 

 B. hyadesi is a more delicate species with bigger avicularia in which the beak forms a 

 larger proportion of the total length. The avicularia are attached more proximally. The 

 small, cap-like ovicell is quite unlike the globose ovicell of B. turrita. 



Jullien found B. hyadesi on fronds of Macrocystis from the region of Cape Horn, and 

 Calvet records a similar habitat. It seems probable that it is a synonym of Acamarchis 

 brasiliensis d'Orbigny which was found on Sargassum off the coast of Brazil, where it 

 was rare. D'Orbigny's fig. 5, which is natural size, represents a delicate species, similar 

 to Bugida hyadesi, and figs. 7 and 8 show bifurcations of type 3, and long zooecia agreeing 

 very exactly with those of B. hyadesi. In view of the small size of the ovicells it is not 

 to be expected that d'Orbigny should have detected them with the instruments at his 

 disposal and, though the avicularia seem to us conspicuous, Waters (19056, p. 6) has 

 shown that a large one was overlooked by d'Orbigny in Acamarchis multiserialis. 



5. Bugula neritina (Linnaeus). 



Sertularia neritina Linnaeus, 1758, p. 815. 



Bugula neritina Marcus, 1937, p. 66, pi. xiii, fig. 34 (references); Neviani, 1939, p. 18; Hast- 

 ings, 1939. P- 33 6 - 

 Station distribution. Not represented in the Discovery collections. 



Geographical distribution. East and west temperate Atlantic (including Britain at Plymouth 

 and Falmouth); east and west tropical Atlantic; Mediterranean; Suez Canal; Red Sea; Indian 

 Ocean; Cape of Good Hope; Australia (west, south and east); Tasmania; Auckland Islands; New 

 Zealand; Japan; California; Balboa; Galapagos Islands; Valparaiso; Falkland Islands. 



The collection lent me by the U.S. National Museum included a specimen of Bugula 

 neritina from Port William, Falkland Islands. The species is not otherwise known from 



