PLATE XVI. 



i i n. sp. Portions of same. ./ Filament with short lateral tenacula. b Apical 



filament with pseudo-lateral branchlets terminating in tenacula. c Single tenaculuro of 

 in. All 200. 

 , , . .; . . Rhipilia orientalis a. sp. Habit of plants; subpeltate and flabelliform examples of the 

 same gathering nat. si/e. Fau. Aug. 11. [899. Siboga Expedition. Alcohol specimen). 



135. Ditto. Frond-filament of same, showing pseudo-lateral bra terminated by tenacula. At 



ime "f them are seen attached to neighbouring filaments. 40. 



136. Ditto. Portion Qf same at margin, seen in surface view, showing the very loose texture ofthallus, 



and the reciprocal linking of the main filaments by means of the tenacula on the pseudo- 

 lateral branchli 100. <i. />. c tenacula 200. </ supradichotomial constrictions of a mam 

 filament. This character is rarely found in Rhipilia). 200. 



Cladocephalus (see also figs. 32—35 on plate IV). 



[37. Cladocephalus scoparius Howe. Plant showing scopulaeform habit. nat. size. Bahamas, Howe 



n". 4079 in Herb. Mus. Brit.). 

 [38. Ditto. Frond-filament of same, dichotomously branched; the smaller branch on the left is 



repeatedly and densely divaricato-dichotomously subdivided into ramelli, which are intrii 



together to form 1 ortex. Dried specimen. 178. 



(For C. luteo-fuscus see figs. 32 — 35 on plate lYi. 



' l [39. Cladocephalus excentricus. Plant showing peltate habit, with frond concave above, nat. size. 



rgados Carajos, J. S. Gardiner in Herb. Mus. Brit.). 

 i; . Dittn. ,i Frond-filament of same, dichotomously branched: one branch is shown repeatedly 

 dichotomously subdivided int<> terminal ramelli which form a pseudo-cortex. 178. /> 1 erminal 

 ramification of a similar branch, 178. {a and b were taken from a dried specimen.) c External 

 view of natura! surface of frond showing how the branched terminal ramelli are normally 

 interwoven into a pseudo-cortex. • 280. Alcohol specimen.) 



