C 3*7 *). i i * . J thirteenth species. Tripoli. Trippel.—'Werner. Tripela, WW/. t. i. p. 94—Trippel, Wid. p. 353.—Tri poli, Kirvo. vol. 1. p. >02'. Id. Ejlner, b. 2. f. 631. Id. Emm. b. 1. f. 30-]—Id. Nop. p. 210.—Id. Lam. t. 2. P- 457.--Le Tripoli, Broch. t. 1. p. 379.—Lava coftile tf ipoleene et thermantide tripoleene, Hauy > t. 4. p. 469. External Characters. * Its colour is yellowilh grey, which paffes into afh grey. Occurs only maflive. ' ^ternally it is dull. ^ r a&ure pretty coarfe earthy. e d r j® ments * nt I etenn i n ately angular, and blunt ly approaching to friable, eels meagre and rough. ^°es not adhere to the tongue. ^°t particularly heavy, approaching to light. G cognostic