38 Prof. G. Gulliver on Raphides and other Crystals in Plants. anticis fere contiguis, subtrigonatis, erectis ; tibiis posticis apice mu-ticis ; unguiculis bifidis. Presternum angustissimum. Type, Eumcea pulchra^ Baly. Distinguished from the preceding genus by the slender an-tennae, the costate elytra, and the different form of the sulcation of the thorax. In Eumcea the depression extends nearly across the surface of the disk, not quite reaching its lateral border, either side being impressed by a large deep fovea. In Nicea the sulcation is broader, extending entirely across the disk to the lateral border, and has its front and hinder edges much less distinctly marked. Eumaa pulchra. E. elongata, postice pauUo ampliata, convexa, Isete fulva, nitida ; oculis, pedibus elytrisque nigris, his fascia lata fulva ornatis, sin-gulatim infra basin transversim sulcatis, 5-costatis, costis duabus exterioribus valde elevatis, caeteris indistinctis ; antennis fulvo-fuscis, articulis apice piceis. Long. 4| lin. Hab. New Guinea. VI. — Observations on Raphides and other Crystals in Plants. By George Gulliver, F.R.S. [Continued from vol. xiv. p. 252.] Ternstrcemiacece. — Many sphseraphides, but no raphides, in the leaves and bark of young twigs of Camellia euryoides and of a garden variety of Camellia. VitacecjE. — Leaves, and their modifications or appendages, of Vitis odoratissima, V. apiifolia, two species of Ampelopsis, and Cissus discolor: all abounding more or less in raphides and sphseraphides, as is the case in every plant which I have examined of this order. Zygophyllacece. — The crystals in the bark of Guaiacum officinale are large prisms, like those of Quillaja, Iris, &c. The prisms have commonly four equal faces, and two of them are occasion-ally broader than the other two, as in Fourcroya. We have already noticed that some of the prisms are triangular; and this and the flattened square are such forms as might result from a longitudinal cleavage of the equally four-sided shafts, in one case diagonally from angle to angle, and in the other from the centre of each of the two opposite faces. But I have at present seen only imperfect evidence of such cleavage. Melastomacece. — Leaves and twigs of Melastoma, sp. : sphse-raphides plentiful, especially in the liber and mcsophloeum ; but no raphides.
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