141 



The colonies are unilaminate, dichotomously branched and their branches 

 have up to 8 rows of zocEcia. They are as in the foregoing species bordered by 

 a belt of radical fibres. 



Of this species I have examined some colonies from Napier, N. Zealand, for 

 which I am indebted to Miss Jelly. 



Canda Lamouroux. 

 (PL II, fig. 9 a). 



The zoaecia are on the basal surface furnished with a vibraculum which 

 (apart from the adjacent chamber of radical fibres) only contains a single cavity; 

 the flagellum is not dentate. The frontal areas of the two rows of zocecia form 

 obtuse angles with each other, and the neighbouring branches of the fan-shaped 

 colony are connected by parallel radical fibres, which are always given off from 

 or terminate in the chambers connected with the vibracula; no marginal aui- 

 cularia. 



The zooecia have at the distal end a shorter or longer spine on each side. 

 They have no frontal gymnocyst, the calcification of the frontal surface being 

 exclusively formed by a more or less granular, asymmetrical, deepened crypto- 

 cyst, the extent of which is different in the various forms. The ooecia are endo- 

 zooecial, being enclosed in avicularia, and in the latter we may thus distinguish 

 between a proximal, wider part, the ectoocecium, whose frontal wall is furnished 

 with a rounded, uncalcified portion, and a distal, cap-shaped part, the real avi- 

 cularium. The boundary between the two parts is formed by an angularly bent 

 transverse belt in which the ectoocecium and the endoooecium have coalesced. 

 To communicate with the avicularium the zooecium has a small rosette-plate. 



Of this genus four species have hitherto been described, chiefly on very rela- 

 tive characters and without any large material, and it may accordingly be diffi- 

 cult to decide for cei-tain, how many of these species are maintainable. Our Mu- 

 seum is only in possession of a plentiful material of a West Indian species, 

 besides a colony from Bass Straits of C. arachnoides and a small fragment of C. 

 retiformis, sent from the British Museum. From the same Museum I have bor- 

 rowed a preparation of Canda simplex Busk, for examination, but it was covered 

 with heterogeneous bodies to such an extent, that it was impossible for me to 

 decide whether this form, as I think probable, is identical with the above-men- 

 tioned West Indian, which accordingly I must give a special name. 



On the basis of this material I may now give the following synopsis of the 

 Canda species. 



