and on the Structure of Hydnora africana. 243 



R. (CuMiNGii) dioica, antheris 10-12, stylis antheras numero vix superantibus 

 abbreviatis: exterioribus (ssepiiis 10) simplici serie ; interioribus (1-3) 

 invicem subiequidistantibus, annulo baseos columnse unico, penanthii 

 tubo intus ramentaceo (diametro floris semipedali). 



Rafflesia Manillana, Teschem. in Boston Journ. Nat. Hist. vol. \v. p. 63. tab. 6. 

 mas. 



hoc. Nat. In Samar, Insula Philippinarum ; ubi primum legit D. Cuming, v. s. et in sp. vin. 

 asserv. 



Desc. Planta dioica R.Arnoldi multoties minor, diametro floris expansi sexpollicari, caete- 

 inim ante expansionem externe similis ut ovum ovo, indusio e cortice Vitis aut Cissi 

 formato rugoso sed vix reticulato ; interne convenit corona faucis indivisa tubo intus 

 ramentaceo : differt annulo baseos columnae unico (exteriore R. Arnoldi deficiente), an- 

 theris maris paucioribus (10-12), stylis utriusque sexus vix antheras numero superan- 

 tibus, baud confertis sed subsimplici serie circularl propius limbo quam centro dispositis, 

 cum nonnuUis (1-3) centralibus invicem distinctis et fere aequidistantibus, omnibus 

 abbreviatis crassitie dimidium longitudinis subagquante, apice pilis brevibus acutis 

 rigidulis barbato : femina absque antherarum rudimentis : ovarii cavitatibus stylos mani- 

 feste superantibus et tam numerosis in centro ac versus peripheriam ut in R. Arnoldi. 



Obs. I. The trivial name Manillana, given to this species by Mr. Tesche- 

 macher, who has described and figured the male flower, can hardly be retained 

 for a plant not known to grow in Luzon, of which Manilla is the capital, but 

 in the island of Samar, where it was first found by Mr. Hugh Cuming. I 

 have named it, therefore, in honour of the discoverer, — a change which is not 

 likely to be objected to, as Mr. Teschemacher {loc. cit.) expresses his readiness 

 to adopt any name Mr. Cuming may wish it to retain. 



Obs. II. In the general tissue of this species each cell has an extremely 

 small, round, opake nucleus. In a transverse section of the column both of 

 the male and female flower, the central part appears to be somewhat more 

 solid ; and each of the cells, of which it seems to be entirely formed, contains a 

 large nucleus easily separable, of a somewhat oval shape, and apparently con- 

 sisting of a membrane including minute granular matter, which renders it 

 opake. In the surrounding somewhat looser substance of the column, there 

 seems to be an oval cell within each outer or mother cell, occupying the 

 greater part of its cavity with less granular matter, and having frequently a 

 minute round nucleus. The parietes of the placentae have in each simple cell 



VOL. XIX. 2 K 



