BRYOZOA 99 



anatomy is much to be desired, but although \ve hâve not yet learnt anything about the ovicells 

 and sorae other organs, there hâve been no grounds for doubting that the récent Hetcropora were 

 Cyclostomatous Bryozoa. The pores between the tubes, the closures, the rays, the cancelli are 

 ail so similar to what are constantly found in Lichcnopora that \ve hâve hère the nearest 

 relationship of any well studied family. Ortmann (') who found H . pelluulata Waters in the 

 Japan Seas, says he has been doubtful as to Hetcropora being Bryozoa, since D r Dôderlein 

 pointed out to him that the thin covering membrane consisted of three-rayed sponge spicules. 

 I think it is hardly necessary to say that the membrane over the Japan spécimens which I 

 described was nothing of the kind. 



Gregory (Catalogue of the Cretaceous Bryozoa, vol. I, p. 404) thinks, that the living 

 species referred to Hetcropora, probably belong to his suborder Dactylcthrata. Until we know 

 more about the anatomv it will be impossible to be sure about the position, but without entering 

 into the validity of the suborders of Gregory, I must emphatically state, that supported by 

 sections I hâve préparée! of Jurassic, Cretaceous, and Tertiary fossils, there is no doubt of there 

 being in ail thèse formations, fossils closely related to the récent Hetcropora, and probably of the 

 same genus. That there are many fossils similar in form to Hetcropora, which will hâve to be 

 separated, is of course probable. 



Many paleontologists hâve undoubtedly attached too much importance to the spaces 

 between the zoœcial tubes, for, while they must always be a valuable spécifie character, undue 

 weight should not be given to them, as there is at présent no reason for considering, that they 

 contained spécial organs. 



Habitat. — Bancs des Aiguilles (S. Africa), Lat. 34°5y' S.- Long. 19° 55' E.; j5 met. 



Exp. Antarct. Belge. 



N° 619, Tangles VIII. Lat. 70 00' S.- Long. 8o° 4S' W.; 5oo ? met.; +0.9 C. 



ENTOPROCTA 



Barentsia discreta (Busk) 



(PL VII, figs. 6<7-/; PL VIII, figs. 178-1 



Ascopodaria discreta Busk, Zool. Chall. Exp., vol. XVII, pt. L, p. 44, pi. X. figs. 6-12. 

 Pediceïïina australis Jullien (non Ridley), Mission scientifique du Cap Hom, p. i3. 



Five spécimens from N° g5i are undoubtedly this species, but there is not the material for 

 making a sufficient number of sections for study. The polypides are rather larger than those 

 mentioned by Busk but in Pedicellinidœ the range of variation in size is considérable. The total 

 lenoth is 3-4 mm whereas B. gracilis from Naples and from Lizard Island, off Queensland is 

 about i-2 mm , and the nodosa variety from Naples is about the same size, namely i-2 mm . Jullien 

 says B. australis J. is 3 mm long and has 12-14 tentacles, whereas Busk gives 16-20 tentacles. 

 Some spécimens in Jullien's collection are identical in size with those from N° g5i, the nodules 

 are quite similar and there does nqt seem any reason for doubt as to both the spécimens brought 

 by the Belgica, and Jullien's being the discreta of Busk. There are nodules on the pedicels 



(1) Die Japanische Bryozoen. {Arch. f. Naturgesch., 1890, p. 66.) 



