141 



The colonies are imilaininate, dichotomously branched and their branches 

 have up to 8 rows of zooecia. 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. 

 (PI. II, fig. 9 a). 



The zoa'cia are on the basal surface furnished with a inbraciiliiiu 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 zoa^cia 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 vibracuhi; no marginal uui- 

 ciiUiria. 



The zoa>cia 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 ditTerent in the various forms. The on>cia are endo- 

 zocjecial, being enclosed in avicularia, and in the latter we may thus tlistinguish 

 between a proximal, wider j)art, the ectoooecium, 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 ectooa'cium and the endoooecium have coalesced. 

 To communicate with tlie avicularium the zoo^cium 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 certain, how many of these species are maintainable. Our Mu- 

 seum is only in possession of a plentiful material of a West hidian 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 (lundu siiuphw Busk, for examination, but it was covered 

 with heterogeneous bodies to such an extent, that it was imjiossible 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. 



