458 Scientific Proceedings, Royal Dublin Society. 



5- and 6-ply rays = 1-1 mm., rising to 2-0 mm. Width = 0-08. PI. XXXI,, 

 figs. 58, 59, 60. 



Type IV — Khaya sp. ? — Parenchymatous laminae occasional. Scattered 

 parenchyma conspicuous, adhering to rays, and extending in tangential plates. 

 Bays 90-100 in 2-mm. field T.S. Average height = 0-50 mm. Width = 0-06. 

 PL XXXIL, figs. 61, 62, 63. 



16. Khaya anthotheca (Type I.). 



No. 149. Small specimen of sapwood, with bark, from Royal Botanic 

 Gardens, Kew, labelled "Khaya anthotheca G. DO., Uganda, 1906. Coll. 

 M. J. Dawe." Case No. 149. Light greyish brown in transverse section, 

 and lustrous in radial and tangential section ; vessels and rays distinct, 

 latter reddish. Broad parenchymatous laminae, about 0^5 cm. apart. Vessels 

 grouped in zones. Boey. PL XXX., figs. 52, 53. 



C.S. — Vessels circular, M.T.D. = - 35 mm., radially grouped, some in 

 tangential contact; about 15-20 groups in 2-mm. field. Empty. — Fibres 

 thin-walled. — Parenchyma circumvasal and in thick laminae.— Bays with 

 dark contents. 



T.S. — Bays irregular ; sides bowed, sigmoid ; about 25 in 2-mm. field ; 

 total width in 2 mm. 0-67. Height 0"70 mm. up to 1 mm. Width = 0-084 mm. 

 (1-,) 2-, 3-, 4-, 5-, 6-, 7-ply. Margin of several cells deep, often with crystals. 

 Palisade-like fringe. Middle cells smaller, rounded, often with dark contents 



Note. — This species, according to Mell (10), furnishes white mahogany. 



17. Khaya senegalensis (Type II.). 



This type comprises the wood derived from Khaya senegalensis, A. Juss., 

 and possibly that from other species, which resemble that species in micro- 

 scopic structure. The following samples were examined : — 



No. 150, from the Boyal Gardens, Kew, labelled " Gambia- mahogany, 

 Khaya senegalensis A. Juss. Gambia. 1S90, Coll. Sir G. Carter." 



No. 40, from National Museum, Dublin, labelled " Khaya senegalensis. 

 Benin. J. Jackson, Esq., Kew." PL XXX., figs. 49, 50, 51, 



No. 314, from the Conservator of Forests, Central Circle, Nigeria, labelled 

 " Khaya senegalensis." \ ■■ i 



No. 315, from the Conservator of Forests, Central Circle, Nigeria, labelled 

 " Khaya grandis." 



No. 316, from the Conservator of Forests, Central Circle, Nigeria, labelled 

 " Kliaya punehii." '.■■.:. 



No. 311, from commercial source, labelled "Benin mahogany, (probably)." 



