5o EXPEDITION ANTARCTIQUE BELGE 



Schizoporella, a name, which at présent will be more widely used, until various groups are 

 definitely separated. 



The 5. Cecilii Aud. group, containing 5. circinata MacG., and 5. pes anseris Smitt, has 

 an operculum with a moveable tongue in the middle of the nearly straight proximal edge 

 (PI. VIII, fig. 24). Phonicosia Jousseamei jullien may belong to this group, but as it was 

 described from one small dead spécimen, without opercula, we are not sure as to the 

 structure, and the sinus is wider than in any of the mentioned species. 



Another group seems to be formed by S. tuberosa Reuss, S. pçlymorpha Bush, 

 S. filocincta Waters, S. conservata Waters, ail of which hâve very large opercula with the 

 muscular attachments some distance from the edge (PI. VI II, fig. 21). 



The necessity of a revision is shown by the fact that Busk placed under Lepralia his 

 L. incisa B. of the Challenger Expédition, and described another species with a similar 

 aperture as Schizoporella nivea B. and thèse two seem to be the same species or very clôsely allied. 



In Lepralia the muscular attachments seem always to be at the side of the operculum, 

 usually part of a ridge. Lepralia vestita Hincks must be removed from Lepralia to Schizoporella, 

 on account of the muscular attachments being far from the edge. 



Schizoporella Ridleyi MacGillivray 



Schizoporella Ridleyi MacGillivray, Traits. Roy. Soc. Vict., vol. XIX. p. rai, pi. I, fig. I; Prod. Zoo!. Vict., dec. 



XIV, p. 14S, pi. i3S, fig. 6; Tort. Polyzoa Victoria, p. 85. ni. XI. fig. 18; Quelch, Ami. Mag. Nat. 



Hist., ser. 5, vol. XIII, p. 2i5 ; Waters, Quart. Journ. Geol. Soc, vol. XLIII, p. 64; Hamilton, Traits. 



New Zeàland lus/., vol. XXX. p. 192. 

 Schizoporella maruspiitm (oi MacG.). Ridley, Pi .'. Soc, 1S81, p l8, pi. VI, fig. 6. 



onella rimosa Jullien, Mission du Cap Horn, p. 47, pi. I. fi 



There are only a few zocecia, and there is only one small globular ovicell. There 

 is a distal pore chamber and usually four latéral pore chambers, but this is subject to 

 variation as is seen in a spécimen sent to me b}* Jullien, as Bujfoiiella rimosa }. 



It has been a question whether this is the Escharina simplex d'Orb. described as 

 punctured, hovvever this was a mistake of d'Orbigny's, as the original spécimen in the 

 Muséum in Paris is granular. The S. Ridleyi is a smaller species than S. simplex, with 

 smaller aperture and this last is referred to on page 5r. 



This, as already stated, belongs to a group throughout which the opercula are almost 

 identical, having the muscular attachments some distance from the border, and there is a 

 tumid avicularium below the aperture, with an internai tubular connection at each side of 

 the avicularian chamber. The surface of the zoarium and the ovicell is smooth, or nearly 

 so, in the group, and if Jullien's description of Buffonella were not so limited, the generic 

 name could hâve been adopted, and this may yet be the best course. 



Habitat. — Victoria, New Zealand (Ham.) ; Elizabeth Island, Straits of Magellan 

 (Ridley) ; Ile Hoste, Baie Orange (Jull.). 



Fossil : New Zealand (Wat.) ; Muddy Creek (MacG.). 



Exp. x\ntarct. Belge. 



N° 570 on stone, Tangles VII. Lat. 70 23' S.- Long. 82° 47' W. ; 480 met.; +0.8 C. 



N° 820, Tangles X. Lat. 70 i5' S.- Long. 84 06' W. ; 56g met.; -0.8 C. 



