5 EXPÉDITION" ANTARCTIQUE BELGE 



of St. Lawrence ; Hobson's Bay (Australia) ; Victoria ; Tasmania ; New Zealand ; Cape Town 

 (S. Africa) ; Mazatlan ; Patagonia ; Falkland Islands. 



Fossil : Tertiaries of Italy and Sicily ; English Crag. 



Exp. Antarct. Belge. 



N os 277, 288, Dredge I. Lat. 71 09' S.- Long. 89 i5' W. ; 460 met. ; -o.3 C. 



N° 392, Eel trap I. Lat. 71 i5' S.- Long. 87 39' W. ; 436 met. ; —0.2 C. 



N os 56i, 570, 596, Tangles VIL Lat. 70 23' S.- Long. 82 47' \V. ; 4S0 met. ; +0.8 C. 



N° 683, Tangles VIII. Lat. 70 00' S.- Long. 80" 48' W. ; 5oo ? met. ; +0.9 C. 



N° 820, Tangles X. Lat. 70 i5' S.- Long. 84 06' W. ; 56g met. ; +0.8 C. 



N° 140. Porto Torro, Ile Navarin, Magellanes, Chili. 



Hippothoa distans MacG. 



PI. III, fig. 8 



Hippothoa disions MacGiluyray, Trans. Roy. Soc. Vict., vol. IX, p. i3o, 186S ; Zoo!. Vict., dec. XIX, ]>. 321, 

 pi. 187, figs. io-i3 ; Hincks. Ann. Mag. Nat. Hist., ser. 5, vol. VIII, p. 62 ; op. cit., vol. XI. p. 21. 



Hippothoa flagellum Manzoni, Bry. foss. Ital. 4' 1 cont. {SiUungsb. Ak. Naturw., vol. LXI, p. 6, pi. I. fig. 5, 

 1S70 : Supp. alla Fauna dei Bry. Médit. [Sitz. der K. Ak. Wissensck., vol. LXIII, p '3', pi. I, fig. 11 

 Bri. del Plioc. Ant. di Castrocaro, p. 5, pi I. fig 14 : Sequenza, Le Formaz. Terz. nella Prov. di Reggio 

 (iî. Accad. dei Lima. an. CCLXXVII, 1S79. pp 197, 294, 327, 367 ; Hinxks. Ann. Nat. Hist . ser. 4. 

 vol. XX, p. 218; British Marine Polyzoa, p. 293, pi. XLIV, figs. 5-7; Busk, Zool. Chall. Exp., vol. X^ 

 pt. XXX. p. 4. pi. XXXIII. fig. 7. 



Terebripova ramosa d'Orbigny, Voyage dans l'Amérique méridionale, p. 23, pi. X, figs. t6, 17. 



This occurs on the same stones as the H. divaricata, which however is twice the size. 

 There is sometimes a keel and the ovicells hâve an umbo. The outlines of both the polypide 

 cell, and of the ovicell are distinctly seen through the shell wall, and the ovicelligerous zoœcium 

 is about the same length as the ordinary zoœcium. The shells to which it is attached are 

 usually somewhat excavated where the zoœcia grew, but this is not at ail unusual in Bryozoa, 

 so that there is no reason for the genus Terebripora, however we cannot take d'Orbigxy's name 

 as he gave practically no description of the zoœcia. 



In a spécimen of Hippothoa from Sydney, New South Wales (fig. 8e, f, g), which I 

 think must be united with H. distans there are two short processes (never exceeding i mm ) 

 arising from the side of the zoœcium, below the latéral tubular branches. Thèse processes 

 hâve a chitinous disk at the end, but I ara unable to state that it is moveable though apparently 

 this is the case. What their fonction may be it is difficult to say, for while at first considering 

 they might be the maie cells of Julliex there is nothing to support this, and perhaps the 

 fonction is similar to that of avicularia in keeping the colony oxygenated when the polypides 

 are dead. 



Hippothoa occurs in the Cenomanian (d'Orb.) and in the Senonian of France, Belgium, 

 Bohemia &c. ; but in the fossils it is difficult to be sure of the détermination of thèse creeping 

 species, unless the région of the aperture is well preserved, and therefore we cannot do 

 more than say that Terebripora capillaris Dollfos, from the Devonian, appears to be Hippothoa. 

 Some Jurassic fossils described bv Fischer are also probably Hippothoa. 



The two Antarctic species and close allies are widely destributed in space and time. 



