PLATE XVIII. 



Tydemania. 



1 , , nania expeditionis Webei van Bosse. Habit of glomuliferous plant, nat. size. (Spirit 



imen. Saleh Bay, 8 — 16 fathoms, Siboga Expedition). a) Filament from a glomerulus of 



same showing dichotomous branching in alternate planes. 16. 

 I 154, Ditto. Portion of plant neai base showing main axis with four nodes; around the axis at the 



upper node is situated a glomerulus, from the three lower nodes spring shortly stalked 



flabella. 8. (Kabala dua, Siboga Expedition). 

 1 iemania Gardineri n. sp. Portion of plant showing habit, • 8 (Amirante, ./'. Stanley Gardiner). 



The main axis, ,/, if traced, is seen to possess two nodes from which arise moniliform branch- 



systems which after 4 6 dichotomies terminate in flabella; other branches are cylindric and 



bear rhizoids. 

 .in plate XIX. 



/ \ nicillus. 



1 157. Penicillus dumetosus Decne. Habit of LAMOUROl X's type (badly figured in his Hist. Polyp. Corall. 



Flex. tab. VÏII. fig. 3), nat. size. (Antilies, sub nom. ^Nesaea dumetosa" in Herb. Lamouroux). 



Ditto. a. Comal filament of Decaisne's plant ("Antilles. Voyage <\u Cap. Baudin") in Herb. Mus. 



Paris, ifter decalcification). b. dichotomy about 30. [Fig. 158*: and d on plate XIX. j 



