64 On new Cyclostomatous Bryozoa from Madeira. 



p. 34) needs a little modification by the addition of the 

 following clause at the end : — " or in lines extending at right 

 angles to the direction of their elongate lateral troughs." 



FrondiporidaB. 



Frondipora maderensi^^ J. Y. Johnson. 



Shortly stipitate, irregularly ramose; branches sometimes 

 upright, usually spreading laterally and curving retrorsely, 

 rarely meeting and uniting. The ultimate branches (tertiary 

 or quaternary) are short and lobe-like. 



The fasciculate cells open at the truncate ends of the 

 upright branches and lobes ; the orifices extend along the 

 upperside of the lobes, but are not continued upon the 

 branches. The orifices are pentagonal, and smaller ones are 

 intermixed. The smallest lobes have only from one to tin-ee 

 orifices ; on others the orifices are seen in two connate series. 



The branches are subtriquetrous, i. e. they are broader 

 at the front than at the back. The anterior surface is 

 obscurely granular ; the posterior surface is faintly wrinkled 

 transversely and is finely punctate reticulately. When fresh 

 from the sea the zoarium is coloured a pale yellow, which 

 fades to white. 



The largest of the specimens rises vertically but a short 

 distance above its base, and then spreads laterally 39 millim. 

 in one direction and 27 millim. at right angles thereto. All 

 the specimens, which have been many years in my possession, 

 were either attached to dead individuals of the coral Madracis 

 asperula, M.-E. & H., or were seated on sponges so attached. 

 This coral is found in deep water off the coast of Madeira. 



Reference may be made to Mr. Busk's figures of Frondi- 

 pora ])almata, Bk. (Cat. Cyclost. Pol. B. M. pi. xx. figs. 4, 5). 

 The describer was not certain as to the locality from which 

 his specimens came, but he believed they were brought from 

 Australia. 



The species now described differs from F. palmata in these 

 respects: — (1) the fasciculi of orifices are not continuous 

 along the branches, but are confined to the ultimate lobes ; 

 (2) the orifices do not open upon a raised portion of the 

 horizontal branch or lobe, but open at once on the front of 

 the lobe or at the ends of the upright branches ; (3) Mr. Busk's 

 fig. 5 represents the branch between the lobes with a pitted 

 surface. In the new species no part of the branch is visible 

 between the lobes, the front of the branches and lobes being, 

 as stated above, broader in front than behind. No part of 

 the zoarium has a pitted surface. 



