446 REPORT ON THE POLYZOA COLLECTED BY DR WILLEY 



orifice lies in the centre of a hexagonal depression surrounded by the thickened 

 calcareous wall of the zooecium. Orifice arched above with a wide sinus below ; at 

 the junction of the two parts a minute denticle on each side. 



On each side of the orifice in the young cell a minute oval avicularium placed 

 on a small elevation ; large vicarious avicularia with broad duck-bill shaped mandibles. 



Ooecia ? 



Measurements of zooecium : "29 mm. in width x "35 mm. in length. 



32. Lepralia feegeensis, Busk. PI. XLIII., fig. 7. Busk, Challenger Report, xxx. 

 p. 144. 



This species is abundantly represented in the collection. The opercula differ slightly 

 from those of the Challenger specimens. In the latter, the lower margins of the 

 opercula are straight or slightly curved inwards ; the Lifu specimens have the lower 

 margin slightly curved outwai-ds forming an indistinct sinus. 



Ooecia are plentiful ; these do not occur on the Challenger specimens, and have, 

 I believe, not been described. The ooecium is globular and depressed, occupying the 

 greater part of the zooecium behind it. It is covered with large opaque granulations. 

 The fertile cells bear no a\'icularia. 



Measurements of the ooecium : '64 to '74 mm. in width x "6 mm. in length. 



33. Lepralia poissonii, Audouin. 



There is only a tiny colony of this, growing over Lepralia tuberculata (n. sp.). 

 The vibracula are placed at the side of the orifice in line with the upper margin. 

 The vibraculoid mandibles are long, being equal to twice the length of the cell and 

 lie parallel with one another. 



34. Lepralia tuberculata, n. sp. PI. XLIII., fig. 8. 



Zoarium encrusting, in the form of a thick disc, the zooecia occurring only on 

 the upper face. Zooecia contiguous, arranged in radiating rows which become less 

 regular towards the centre ; cells rising towards the orifice giving the zoarium an 

 uneven surface ; surface of the individual zooecium smooth and shining ; above the 

 orifice eight marginal spines. Operculum orbicular or slightly coarctate with a rounded 

 lower border. On each zooecium placed at the sides of the orifice, two elongated 

 a\-icularia with blunt spatulate mandibles directed upwards ; numerous large vicarious 

 avicularia with duck-bill shaped mandibles. Ooecium globular, sub-cucullate, smooth, 

 reaching as far back as the orifice of the cell behind. 

 Measurements : 



zooecium '3 to SB mm. in width x -32 to "42 mm. in length, 

 operculum '1 mm. x ■! mm. 



ooecium "18 mm. in width x "lo mm. in length. 

 There is only one colony of this species. 



35. Lepralia calyciformis, n. sp. PI. XLIII., figs. 9 and 9 a. 



Zoarium unilaminar and cup-shaped, being attached at the base ; zooecia occurring 



