156 Buskin — On Banded and Brecciated Concretions. 



from Gaudichaud's Voyage sur la Bonite, plate 24, given on Plate 

 XX. Figs. 7-11, with the figures of the fossil and the description I 

 have given, must place it beyond doubt that this is a true Pandana- 

 ceous fruit. I propose to designate the genus by the name of 

 Kaidacarpum, Kaida being the Malabar name which Kheede em- 

 ployed in his Hortus Malabaricus, from which book the younger 

 Linnasus chiefly obtained the materials for his genus, although he 

 adopted the later name, Pandanus, from Eumphius. 



Besides the species which I have described, I have seen another 

 in the Woodwardian Museum, Cambridge, from the Potton Sands, 

 which, from its imperfect condition, it would have been impossible 

 to have made anything of, but there is sufficient to establish that 

 it belongs to this genus, and is a distinct species. 



SYNOPSIS OF THE BRITISH PANDANE^. 



Gen. I. — Kaidacarpum, gen. nov. Fruit composed of pyramidal rhomboidal 

 single-seeded drupes, sessile, or sub-sessile on a thickened spadix. 



Sp. I. K. ooUticum, sp. nov. From the Great Oolite at Kingsthorpe. Plate IX. 

 Figs. 1—6. 



Sp. 2. K. Bucklandi, Carr. Strobilites Bucklandi, Lindl. and Hutt. Fossil 

 Flora, Plate 129. From the Upper Greensand, Wiltshire. 



Sp. 3. K. minus, sp. nov. From the Potton Sands, Cambridgeshire. 



Gen. II. PoDOCARYA, Buckl. Fruit composed of an indefinite number of single- 

 seeded cells united into one large compact spheroidal head, and attached to the 

 spadix by long fibrous pedicles. 



Sp. 1. Fodocarya JBucIclandi, Ung., Gen. et Species Plant. Fossillium, p. 327. 

 Buckland, Geology and Mineralogy, PI. 63. From the Inferior Oolite of Char- 

 mouth, Dorsetshire. 



EXPLANATION OF PLATE IX. 



Fig. 1. Kaidacarpum oolitimm. Nat. size, showing the bases of the cells from which 

 the seeds have fallen out. The upper portions of the drupes are seen imbedded in the 

 rock around the fruit. — Fig. 2. A portion from the side of the fruit, showing the rela- 

 tion of the seeds to the drupe. — Fig. 3. Ideal section of a drupe aud seed. — Fig. 4. 

 The form of the apex of a single drupe. — Fig. o. Front view of seed. — Fig. 6. Side 

 view, showing where the placenta touched the seed. Fig. 7. Sussea conotdea, Gaud. 

 Half of a fruit. — Fig. 8. Longitudinal section of a single drupe. — Fig. 9. Transverse 

 section of ditto. — Fig. 10. Seed, front view. — Fig. 11. Ditto, side view. 



II. — On Banded and Brecciated Concretions. 

 TA^y John Euskin, Esq., F.G.S. 



(CoNTINb^D FROM THE JANUARY NuMBER, P. 18). 

 (PLATE X.) 



PROPOSE now to pursue my subject by describing in some detail 

 a series of typical examples of the j)rincipal groups of agatescent 

 minerals ; noting, as we proceed, tlie circumstances in each which 

 ai^pear to afford proper ground for future general classification. 



The upper figure in Plate X. represents, of its real size, the surface 

 of a piece of- jasperine agate in my own collection, belonging to the 

 same general group as the specimen, a, h, d, 5, in the British Museum. 

 This group consists, broadly, of irregular concretions of jasper affected 

 by faults caused by contraction, having their interstices filled with 



I 



