BRYOZOA 9 3 



a rule the séries are continuous. The ovicells spread over a great part of the zoarium, but the 

 ovicellular opening has not yet been found. The figure 1 of d'Orbigxy would suggest, that 

 there were séries ot zoœcia on each side of a médian Une, though figure 2 shows the zoœcia in 

 bundles of three. The zoarial growth of Busk's figure 20, shows what he describes as « narrow, 

 ligulate, dichotomously dividing branches)), — « composed of short irregular séries of tubes», 

 and is as Busk says, closely allied to T. serpens L. The denticulation of the primary zocecium, 

 mentioned by Busk and Jullien, occurs in several other species. The internai measurement 

 of the end of the zoœcial tube of d'Orbigny's spécimen, and of spécimens from Cape Horn 

 is o.i4 mm . 



From spécimens sent to me by Julliex as T. organisons it seemed probable that he had 

 more than one species before him, when describing the species, and in the Paris collection 

 there are some spécimens more like T. serpens L. and also a nearly circular disk-like species, 

 which is probably T.flabellaris Fab. The zoœcia are larger and thicker than in T. organisons, 

 the ends measure o.ig mm , the ovicells are circular, and the oœciostome is wide and funnel- 

 shaped. 



Habitat. — Falkland Islands (d'Orb.) ; Kerguelen (Busk); Straits of Magellan 6 fathoms 

 (10 met.) (Ridley) ; Baie Orange (on seaweeds &c). 

 Exp. Antarct. Belge. 

 N os 13c, 140. Porto Torro, ile Navarin, Magellanes, Chili. Jan. 3 rd , 1898. 



Hornera antarctica sp. nov. 



(PI. IX, figS. 1(7-/» 



Zoarium slender, in one plane, or spreading out horizontally from a short stem, branches 

 dichotomising, or at right angles. The small latéral branches at right angles to the main 

 branches, with projecting tubular zoœcia at the ends, occur frequently in the older parts 

 of the zoarium. 



The zoœcia are not enclosed in rhomboidal spaces, but on both the anterior and 

 dorsal surfaces there are fine sulci, with moderate sized pores in the sulci. The orifices 

 are exserted, and the latéral ones may often reach a considérable length, in a few cases 

 the length is equal to the diameter of the zoarium, the interior diameter of the zoœcial 

 tube is about o.i mm . 



The ovicells are on the dorsal surface, irregularly ovate, deeply pitted. The dorsal 

 surface is granular, and sulcate, while along the Une of the sulci there are pores smaller 

 than those of Arctic H. liehenoides L. There are 8-g tentacles, but in the spécimens decalcified 

 there were but few complète polypides. 



Not many zoaria hâve ovicells, and in those eut it is apparent that most of the 

 embryos hâve left the ovicells, the « protoplasmic reticulum » having contracted in conse 

 quence, but there are some full sized ones left, besides the earlier stages in various parts 

 of the protoplasmic reticulum. I give a fuller description of the embryos of the Arctic 

 Hornera liehenoides in my fortheoming paper on the Cyclostomata of the Franz-Josef Land, 

 and as the state of préservation was better in those spécimens I would merely state, that while 

 the number of embryos in Diastopora intriearia Sm. is considérable, being over one hundred, it 



