204 DR. J. E. GRAY ON SACCOMYIN^. [Mar. 12, 



chives. At length, in 1828, he commenced to pubhsh 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 Pentacri?ius 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 verj' 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. . y 



Hab. Honduras. ■• . ,. .; ^w j . ^..mVm ■ ^'7 2-/'^ ^/\ 



Very like Perognathus bicolor, the tail much longer, aild the fur I 



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 hiilf of the cheek-pouches, chin, chest, and underside 

 of the body, inner side of the limbs, and lovverside 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 



