BRYOZOA 5i 



Schizoporella simplex (d'Orb.) (non Johnst.) 



(PI. III, fig. 6) 



Escharina simplex D'Orbigny, Voyage dans L'Amérique méridionale, p. i3, pi. V, figs. 5, 8. 

 Repioporina simplex D'Orbigny, Pal. fr., Terr. crét.. p. 442. 



Zoarium adnate. Zoœcia ovate, surface faintlv granular ; oral aperture with a distinct 

 narrow sinus, and a little below the aperture there is a chamber, which must probably be 

 considérée! as a degenerate avicularium. It has a small round opening, but there does not 

 appear to be any mandible, and from each side of this chamber, there is a tube opening 

 on the interior of the zoœcium, but visible through the cell wall. As I hâve mentioned, 

 in previous papers, avicularia are fréquent ly connected with two différent parts of the zoœcium, 

 so that this chamber may be looked upon as typical avicularian, although the mandible is 

 wanting and the chamber seems too small to be functional. 



The 5. simplex d'Orb. i36/3 from the Falkland Islands has the avicularian chamber 

 as just described, and the surface is finely granular, not punctured, as stated by d'Orbigny. 

 Before examining the type I had not recognised the identity, and h ad named the Antarctic 

 form S. bijuncta nov. but although d'Orbigny's description was not quite correct it is perhaps 

 better to retain the name he gave. 



The Antarctic 5. simplex d'Orb. has the aperture just about twice the width of that 

 of 5. Ridleyi MacG., but they are in many respects very similar. The smaller S. Ridleyi is 

 however smooth, whereas simplex is granular. 



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



Exp. Antaret. Belge. 



N° 332, Tangles IV. Lat. 71° 18' S.- Long. 88° 02' W. ; 435 met.; — o.3 C. 



N° 5g6, Tangles VII. Lat. 70° 23' S.- Long. 82 47' W.; 480 met.; -0.8 C. 



N° 392, Eel trap I. Lat. 71 i5' S.- Long. 87" 3g' W.; 436 met.; — 0.2 C. 



Schizoporella hosteensis (Jullien) 



PI. III, figs. ii(7, b, c) 



Laccrua hosteensis Jullien, Mission scient, du Cap Horn, p. 4S, pi. I, fig. 2. 

 Lacema de Carforli Julliex, Ibid., name on plate I, fig. 2. 



Spécimens from the Antarctic are in most respects much like Julliex's, but differ in 

 being slightly granular, whereas Jui.lien's from Cape Horn are smooth. A spécimen sent 

 to me by the late D r Jullien cannot however be called hyaline, as described by him ; and 

 it also has the zoœcia smaller than the mature zoœcia of the Antarctic form, but as can be 

 seen in fig. n<7, the early zoœcia vary much in size. 



In the spécimens from 61g, the zoœcia as a rule, hâve only two oral spines, but in 

 a few cases there are four ; while from 5g6 there are never less than four. The ovicell of 

 619 is smooth, and has a row of pores round the border. 



In the older zoœcia the pores round the border are often indistinguishable, ancl there 

 are frequently two larger pores near the aperture. The pore chambers can be seen in the 

 right hand zoœcium fig. lia. There are 10 spines to the oval primary zoœcium. 



