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Show 204 DR. J. E. GRAY ON SACCOMYINAE. [Mar. Iz, chives. At length, in 1828, he commenced to publish at Cork a series of papers illustrated with his own etchings, under the title ' Zoological Researches and Illustrations of Natural History,' with plates, 8vo. They did not sell sufficient to repay the expense of printing, and the series came to a premature end on the publication of the fifth part in 1834. He also printed a " Memoir on the Pentacrinus europceus, a recent species discovered in the cove of Cork," 1st July 1823, Cork, in quarto, with two plates. This animal proved to be the first state of the Comatula. The memoir on Pentacrinus and the ** Zoological Researches' are now very rare. The specimen of the present animal, which Mr. Thompson sent to the Linnean Society along with his paper, was left in the hands of the artist (Mr. James Sowerby) to whom it was sent to be figured and engraved, and not returned. Years after, when the skin was nearly destroyed, Mr. James De Carle Sowerby gave it to me, and I placed it in the British Museum, where the skull and imperfect skin now are. In this way many typical specimens are lost, as the specimen of Rossia and the Lepidoptera collected by Sir James Ross in the Arctic seas, which were for years in the hands of Mr. Curtis, and, I believe, are now lost to science. 2. HETEROMYS DESMARESTIANUS. B.M. Cutting-teeth small, upper flat, lower keeled, narrow in front, ears moderate, exposed. Chestnut-brown; tip of nape, lips, chin, and underside of the body, feet, and underside of tail white ; spines of back white, with chestnut tips. Heteromys desmarestiana, Gray, P. Z. S. xi. 1843, p. 79 (noticed). Hab. Coban. B.M. This is very like H. anomalus, and may not be distinct from it. 3. HETEROMYS MELANOLEUCUS. Fur black ; upper lip, lower edge of cheek-pouch, chin, and underside of body white ; legs and feet black. Ears large; tail much longer than the body and head ; fur harsh ; hair of back moderately broad, keeled, with bristle-like tips and a quantity of interspersed slender elongated hairs. Perognathus monticolor, Gerrard, B.M., not S. Baird. Hab. Honduras. Very like Perognathus bicolor, the tail much longer, and the fur harsh, formed of well-marked channelled spines, and many slender elongated hairs. 4. HETEROMYS LONGICAUDATUS. Fur grey, black and yellow mixed ; lower surface of nose, upper lip, lower half of the cheek-pouches, chin, chest, and underside of the body, inner side of the limbs, and lowerside of the tail white ; upper surface of fore and hind feet whitish ; ears moderate exposed; tail much longer than body and head, slender, nakedish, with a few short hairs at the tip. Fur smooth; hair of the back |