242 ME. A. W. •WATERS OK 



avicularium, and. the narrow acute mandibles hare a long cliarac- 

 teristic lucida. The zooecia resemble those of Cellepora hasti- 

 gera^^ Busk, but the shape of the operculum shows that they 

 are quite distinct. The operculum is A'^ery thin, which, is unusual 

 in Cellepora, and the shape of the proximal edge shows that it 

 fitted into a wide sinus, which cannot be usually seen in the 

 zooecia on account of being concealed by the calcareous growth. 

 There are 13-14 tentacles. 



I have already referred to this species when describing Or^/^oj^ora 

 compactaf, "Waters, and mentioned bow the zoarial growth of 

 the two species corresponds, so that at first I was misled into 

 belieying them to be the same species : but the shape of the oper- 

 culum proved that they were quite dijfferent, and O. compacta 

 has 24 tentacles, whereas the present species has only 13 or 14. 



Though the name Cellepora is here used, it is recognised that 

 many species now called Cellepora may have to be removed 

 elsewhere. 



Hab. Cape Horn Exped., Station No. 32 ; lat. 53° 13' S.,, 

 long. 68° 31' W.; 97 met., +6°-6 Cent. 



TUEEITIGEEA STELLATA, JBuslc. 



Turritigera stellata, Busk, Zool. Chall. Exp. vol. x. pt. xxx, p. 130,. 

 pi. 24. fig. 1 ; Waters, op. cit. vol. xxxi. pt. Ixxix. p. 22, pi. 1. figs. 22, 25 ; 

 Waters, Exped. Antarctique Beige, Bryozoa, p. 76, pi. 6. figs. 3 a-c, 

 pi. 8. fig. 13. 



Among the Cape Horn material there is a small and worn 

 fragment, which, however, was just sufficient to show the 

 specific characters. 



Hab. Ofi" the Argentine, 600 fath. {JBuslc) ; Cape of Good 

 Hope, 150 fath. {Busk) ; various Antarctic Stations, 435-569 

 metres {Waters). Cape Horn Exp., Station unknown. 



Eetepoea mageliensis, Busk. 



Reteiiora magellensis, Busk, Zool. Chall. Exp. vol. x. pt. xxx. p. 126,. 

 pi. 36. fig. 20 ; Waters, op. cit. vol. xxxi. pt. Ixxix. p. 22, pi. 3. fig. 5. 



As I have previously pointed out. Busk's description of 

 B. magellensis requires correction, as in the 'Challenger'" and 

 other specimens there are distinct vibices and also semicircular 

 avicularia on the dorsal surface. Probably this is the R. celhi- 



* Zool. Chall. Exp. vol. x. pt. xxx. p. 192, pi. 29. fig. 1. 

 1' Exped. Antarct. Beige, Bryozoa, p. 76. 



