g2 EXPÉDITION ANTARCTIQUE BELGE 



ovicell, caused apparently by the growth of one zoœcium. Pergens (') describes and figures 

 the ovicell in a cretaceous spécimen, as sacciforme, and Busk figured one in the « Challenger 

 Report », as a slight swelling of the zoœcium, perhaps this was an early stage. Gregory 

 speaking of the ovicells of the fossils says piriform or subconical. 



The pore tubes in N° 683 are more or less diagonal, while in older spécimens the pore 

 tubes are hardly noticeable. 



I and others hâve used the spécifie name raripora d'Orb., but as d'Orbigny gave so 

 many names to this species, according to the beds from which it came, it is perhaps unadvisable 

 to retain it on that account ; further Gregory has shown that the name virgula was given by 

 Hagenow in 1840, though it does not seem to hâve been figured then. The insufficient 

 description makes it perhaps advisable, at présent to use the name proboscidea, so as to avoid 

 confusion. 



Gregory thinks there is a différence between the récent E. proboscidea and the fossil 

 E. virgula as he says, that « in the living « species » the zoœcia are more numerous in the 

 proximal parts of the zoarium », but in looking through a large number of spécimens from 

 Naples this is not found to be a constant, or even a gênerai character, in fact sometimes the 

 zoœcia are less numerous in the proximal parts. In récent spécimens of this species, there is 

 a not inconsiderable range of variation, and we must be prepared for the same thing in fossils. 



The most important measurement in Entalophora is the interior of the zoœcial tube, 

 which remains the same for a considérable distance. When the aperture is différent this should 

 also be measured. In E. proboscidea the diameter of the tube is as a rule about o.i6 mm -o.i8 mm 

 and this is the size I hâve found in English and Belgian chalk spécimens, in tertiary, and 

 in récent spécimens from both hémisphères. By a slip Gregory reverses the measurements 

 of the zoœcia, and of the aperture, on pages 221 and 222, «Catalogue of Cretaceous Bryozoa». 



From Cape Horn there is a small spécimen, which I consider is E. proboscidea, and 

 from the same locality E. regularis Busk occurs. 



Habitat. — Mrditerranean, X. Atlantic, Australia, New Zealand, Kerguelen. 

 Fossil : European Tertiaries, Cretaceous and lurassic formations; Tertiary of Australia, 

 and New Zealand. 



Exp. Antarct. Belge. 



N° 1012, Tangles VIL Lat. 70 23' N.- Long. 82 4y' W.; 480 met.; +0.8 C. 



N os 621, 683, 90,1, Tangles VIII. Lat. 70 oo' N.- Long. 80" 48' \Y.; 5oo ? met.; +0.9 C. 



Tubulipora organisans d'Orbigny 



Tubulipora organisans d'Orbigny, Voyage dans l'Amérique méridionale, p. 19, pi. IX. figs. i-3 ; Jullien, 



Mission scient. Cap Horn, p. S2. 

 Tubulipora organizans Busk, Zool. Kerguelen iPhil. Trans., CLXVIII, p. 193, PI. X, figs. 20-25) ; Ridlev, 



Proceedings of the Zool. Soc, iSSt. p. 5S. 



From N os i3g, 140 there are two or three spécimens, in which the zoarium consists oi 

 broad strap-like growths, with alternate uniserial rows of much elevated, long zoœcia attached 

 to one another, while hère and there we get groups of two, three or four zoœcia together, but as 



(1) Nouveaux Bryozoaires Cyclostomes du Crétacé. (Bull. Soc. belge de Géol., vol. IV, p. 278, pi. XI, fig. 6.J 



