6S EXPÉDITION ANTARCTIQUE BELGE 



usually the central portion of the frontal wall without pores, as figured b}- Julliex, howevcr 

 there is one pièce on Aspidostoma gigantea Busk, in which the whole of the frontal surface 

 has pores. 



From the Banc des Aiguilles, S. Africa, there are spécimens in shape and the position 

 of the pores entirely corresponding with typical R. Martiali, but instead of the narrow trian- 

 gular avicularia, within the peristome, there are avicularia with round or spatulate mandibles 

 high up by the side of the peristome, nearer to the peristome than in S. praestita nov. The 

 South African species mentioned, approaches very closely to the New South \Yales species 

 considered by me to be a variety of S. praestans H. ('), though it has a lyrula while none can 

 be found in the S. African form. 



Neither R. Martiali Joli., Cape Horn ; S. pracstita, Antarctic ; 5. praestans H., New 

 Zealand ; S. Jacksoni Waters, Arctic, hâve a lyrula, though other characters recall 5. coccinea, 

 and S. pracstita is left provisionally with Smittia. If fn.i.nx had taken other characters for 

 his genus Romancheina the above might hâve been grouped together though we must wait 

 until we know what Peristomella includes, and the amount of material available for my study 

 of thèse species has been too small for décision as to the characters upon which a new genus 

 should be based. 



Habitat. — Exp. Antarct. Belge. 



N° 570 (without avicularia), Tangles VII. Lat. jo° 2:^' S.- Long. 82°47' W. ; 480 met. ; 

 +0.8 C. 



N° 5g6 (with avicularia), Tangles VII. Lat. 70 23' S.- Long. 82°47' W. ; 480 met. ; 

 +0.8 C. 



Smittia inclusa sp. nov. 



PL IV, figs. Sa-J 



Zoarium cylindrical, branching dichotomouslv, with usually six zoœcia in cross section, 

 namely three full sized and three commencing. Zoœcia elongate, distinct, with a row of 

 fairly large pores surrounding the zoœcia. The peristome is much elevated at the distal 

 end, and at the proximal end there is a groove, leading down to an opening in the denticle, 

 through which it passes. There is occasionally an avicularium with a semicircular mandible 

 at one side just below the peristome. The ovicell is scarcely at ail raised, but the portion 

 above the aperture is somewhat inflated and is much larger than in the non ovicelligerous 

 zoœcia. 



The zoarium is about 1 millim. in diameter ; the lower zoœcia are often quite closed, 

 and the divisions of the zoœcia are only indicated bv the row of pores, whereas the younger 

 zoœcia are very distinct and convex. The most interesting point about this species is the 

 groove in the peristome and it is probable that the lyrula is formed bv two denticles uniting, 

 however it is not quite clear that this plate should be comparée! with the lyrula of Smittia, 

 so that possibly this may hâve to be made the type of a new genus. The groove is similar 

 to those in Retepora of which I wrote ( 2 ) « this pore is frequently the opening of a long 

 tube, which runs down the peristome to the opercular opening ». 



(1) Bry. from New South Wales &c. {Ami. Mag. Nat. Hist., s. 6, vol. IV, p. 17, pi. III, figs. 9-11.) 

 I2) Journ. Linn. Soc. Zool., vol. XXY, p. a56. 



