88 EXPEDITION ANTARCTIQUE BELGE 



Stomatopora major Johnston varietas 



(PL VIII, fig. 16 



There is, from N° 5yo, a small worn colony, much like the European 5. major Johnst. 

 At the side of the zoarium there are small parallel tubes, the zoœcia are alternate, and the 

 zoœcial tube appears to contract at the end, the internai diameter of the end being about 

 o.i2 mm . The zoarium is about twice the width of that of 5. divergeas nov. being a much stouter 

 species. 



Habitat. — Exp. Antarct. Belge. 



N° 570, Tangles VII. Lat. 70 23' S.- Long. 82 47' W.; 480 met.; -fo.8 C. 



Stomatopora eburnea (d Orbigny) 



(PI. IX. figs. 7a-6) 

 Alecto eburnea d'Orbigny, \"oyage dans L'Amérique méridionale, p. 20, pi. IX, figs. 14-16. 



The spécimen from the Antarctic grows on a stone, with the ends of the zoœcial tubes 

 erect, but the adnate- portion frequently extends at the sides of the zoarium, forming a latéral 

 crust, and in this respect it differs from d'Orbigny's species, as figured, but d'Orbigny's 

 spécimen shows much the same structure, and the internai diameter of the zoœcia is about 

 o.i4 mm , while that of the Antarctic spécimen is sometimes as much as o.i7 mm . The dots on 

 the surface, when magnified about 100 times, appear dark, no doubt caused by the contents 

 of the pore tubes. 



This is much like S. granulata M. Ed., in which however the zoœcium has not usually 

 a long erect end. There is also a uniserial species from N° 288 and N° 683, much larger 

 than either 5. antartica or S. eburnea, having the internai diameter of the zoœcia near the end 

 about o.2 mm . 



Habitat. — Falkland Islands (d'Orb.). 



Exp. Antarct. Belge. 



N° 800, Tangles X. Lat. 70 i5' S.- Long. 84° 06' W.; 56g met.; +0.8 C. 



Stomatopora ? incrassata Smitt 



(PI. IX. figs. S,:, 6) 



From N° 348 there is a spécimen with wide branches, creeping on a stone, and at irregular 

 intervais erect branches grow, having zoœcial openings ail round. One such erect branch 

 measures about i mm in diameter, while the internai diameter of the zoœcia is o.2i mm ., and in 

 this spécimen there are but few isolated zoœcial openings on the creeping portion, whereas 

 in a spécimen from N° 991 they are more common. From small broken pièces it is difficult 

 to form a judgment as to the perfect colony, but the appearance is that of Entalophora growing 

 from a common creeping base. This is thought to be the S. incrassata of Smitt, and there 

 are similar fasciculate growths from Australia and Xew Zealand. One from New Zealand has 

 smaller erect branches with about three zoœcial tubes in section, much resembling Filifascigera 



