BRYOZOA 25 



Exp. Antarct. Belge. 



N° 1068. St. of Magellan. Sur la carapace à'Eurypodius Latreilli. 



Scrupocellaria aatarctica sp. nov. 



(PI. I, figs. ia-e; PL VIII, figs. la, I 



Zoarium large, apparently about 40"™ long, jointcd above the area of the outer zoœcium, 

 as is the case in S. Smittii Norman ('). The zoœcia hâve a large bordered area, with an 

 irregularly shaped scutum filling up two thirds of the area. The edge of the scutum is 

 curved and entire. Anterior triangular avicularia near the médian Une of the zoarium, and 

 latéral avicularia near the distal end of the area ; a long oral spine more distinctly seen 

 on the dorsal face of the zoarium than on the anterior. 



With the exception of the spécimens from 924 none hâve a spine at the bifurcation, 

 but in the spécimen mentioned this spine exists in some cases, but not in ail ; in the 

 spécimen from 924 there is another peculiarity, the considérable amount of calcareous matter 

 making the spécimen white, which is unusual in Scrupocellaria. 



In Scrupocellaria antarctica, the radicle tube starts from a small radicular chamber 

 near the proximal end of the zoœcium. The raised ovicell is long and large, and has a 

 thinner area on the front, where the outer of the two walls of the ovicell is wanting; the 

 inner wall has minute tubercles producing a dotted appearance. There is an internai spinous 

 process, sometimes bifurcate or lobate, arising from the proximal wall near the rosette plate 

 (PI. VIII, figs. 2a, b, dt). In no other species of Scrupocellaria, in my collection, has a similar 

 structure been found. A pair of somewhat similar spines is known in Cellarinella foveolata 

 nov. and Svsleiwpora contracta nov., as well as the comb-like process in Membranipora tchuelcha 

 d'Orb. [-), and there is a single comb-like process in Membranipora nitens Hincks. 



The dorsal surface is like that of the Arctic 5. ternata, var. gracilis Smitt, a species 

 corresponding in many particulars with the présent. The articulations are late in forming, 

 and many branches are without any articulation. I showed in 1882 ( 3 ), that in a large 

 number of articulated species, the calcareous wall is at first continuous, but subsequently 

 is broken across, and one or more chitinous tubes then form the articulation ; and this was 

 afterwards confirmed by Lomas. 



According to the classifications of Hincks and Bisk this would be Menipea, but Julliex( + ) 

 found a few vibracula upon his Scrupocellaria inarsupiata, and sait! he had also found some 

 upon the anterior surface of 5. scabra Van Bened. from Greenland &c. and he therefore 

 considered that Menipea should be merged in Scrupocellaria. Subsequently I proposed ( 5 ), 

 that the genus Menipea should be retained for forms of the M. Buskii MacG. type, and then 

 the majority of the remaining Menipea belong to Scrupocellaria. 



(1) YVaters, Bry. from Franz Josef Land. (Liitii. Soc. Journ., vol. XXVIII, pi. VII, fig. S.) 



(2) Waters, On Membraniporidse. (Liini. Soc. Journ. Zoo!., vol. XXVI, pp. 675, 677, pi. XLVIII, figs. 3, 5, 7.) 



(3) Waters, Quart. Journ. Geol. Soc, vol. XXXVII, p. 320 ; and Ann. Mag. Nat. Hist., ser. 5, vol. XX, 

 p. 89, pi. IV, figs. 6, 7. 



(4) Julliex, Drag. du « Travailleur ». [Bull. Soc. Zool. de France, vol. VII, p. 5o8 |n).) 



(5) Waters, Linn. Soc. Journ. Zool., vol. XXVI, p. 2. 



IV 



R 21 



