iói 



which bears numerous fine spines, seems to be distinct from L. novae-zelandiae. The specimen 

 referred by Waters to L. californica l ) has, on the other hand, an ovicell which closely 

 resembles that shown in my own fig. 1 1 . Whether Mr Waters' specimen really belongs to 

 L. californica ma)- be regarded as doubtful. It agrees with the form so named by Busk 2 ) in 

 having biserial or even triserial rays ; but it should be noted that the Unicavca ca/i/oruica of 

 D'Orbignv was described as a member of a genus characterised by having uniserial rays. The 

 form recorded by Miss Robertson 3 ) under the same name has also pluriserial rays, but it does 

 not seem to correspond in the characters of its ovicell with the specimen figured by Waters. 

 The uniserial arrangement of the zooecia in the 'Siboga' colony is a reason for not referring 

 the specimen shown in fig. 1 1 to the species described by Busk, Waters and Miss Robertson 

 as L. californica. L. holdsworthii Busk, described from Ceylon, has, on the other hand, a 

 close resemblance to some of the 'Siboga' specimens referred by me to L. novae-zelandiae. In 

 the original description *) of " Discoporella holdsiuorthii', Busk makes no reference to ovicells, 

 although these structures are present in two of the colonies from Ceylon on a slide (Brit. Mus., 

 75. 5. 29. 48*) belonging to the collection on which his Catalogue was based. In one of these 

 colonies the ovicell occupies a central, much depressed region, surrounded by a high circular ridge 

 formed by zooecia and cancelli. lts porous roof is flat and has a close general resemblance to 

 that shown in my own fig. 1 1 . Five main lobes, two of which divide into secondary lobes 

 by a single bifurcation, are separated by central prolongations of the cancellated region. An 

 ooeciostome, with a large, nearly circular ooeciopore, occurs among the cancelli just outside 

 the flattened porous roof. In the raised circular ridge surrounding the central depression occurs 

 a secondary ovicell of the same general type. The other fertile colony has a cylindrico-truncate 

 form, terminated by a flat region containing one or perhaps two ovicell-roofs of the same 

 general character as in the other colony. 



Taken by themselves Busk's specimens would suggest that L. holdsworthii is distinct 

 from L. novae-zelandiae; but the study of the material considered in this Report indicates that 

 this is probably not the case, and that the differences between the two types are due to variation 

 in the extent to which the cancelli cover the ovicell. It may be remarked that pin-spines are 

 well developed in Busk's specimens. 



2. Lichenopora buski n. sp. (PI. XII, figs 4, 5). 



Discoporella ciliata Busk, 1S75, u Cat. Mar. Pol. Brit. Mus.", III, p. 31, PI. XXX, fig. 6; 



PI. XXXIII, fig. 4. 

 (nee Discopora ciliata Busk, 1855, "Zoophytology", Q. J. Mier. Sci., III, p. 256.) 



Discoporella ciliata Haswell, 1879, "Cycl. Pol. Port Jackson", Proc. Linn. Soc. N. S. Wales, 



IV, p. 354- 

 Lichenopora ciliata Waters, 1887, u Bry. N. S. Wales", III, Ann. Mag. Nat. Hist. (5) XX, 



p. 263, PI. VII, fig. 5. 



1) Waters, A. W., 1889, t. cit., p. 282, PI. XV, fig. 1. 



2) Busk, G., 1875, t. cit., p. 32, PI. XXX, fig. 5. 



3) Robertson, A., 1910, "Cycl. Bry. W. coast N. America", Univ. Calif. Publ. Zool., VI, p. 261, PI. XXV, fig. 48. 



4) Busk, G., 1875, t. cit., p. 33, PI. XXX, fig. 4. 



161 



S1BOGA-EXPEDITIE XXVIII a. 21 



