588 DR. J. E. GRAY ON THE BUSH-BUCKS. [JlUie 20, 



inferne lata et subplanulata. Costa umbonalis rotundata, con- 

 spicua. Umbones eminent es. Lunula satis magna, lanceolata, 

 angulation excavata. Margarita colore salmonis cocti imbuta. 

 Denies validi; dens valvules sinistrce major et natibus propin- 

 quior. 

 Long, lg, lat. 2| poll. 



Sab. Sarawak, Borneo (teste Geale). Mus. Hanley. 

 The description of M. tumida of Morelet (from Venezuela) ac- 

 cords in many respects with the features of this well-marked species, 

 which is not indicated in Lea's recent catalogue of the Naiades. 

 I have named it after Mr. W. Walpole, who is bestowing his atten- 

 tion on a group somewhat neglected in this country. 

 The ligamental sinus is very conspicuous. 



8. Notes on Busk-bucks (Cephalophoridce) in the British 

 Museum, with the Description of two new Species from 

 Gaboon. By Dr. J. E. Gray, F.R.S. &c. 



[Received June 1, 1S7L] 

 (Plates XLIV.-XLVI.) 



The Bush-bucks form a very distinct group of Antilopine animals, 

 peculiar to tropical or Southern Africa, and distinguished by their 

 conical horns arising from the hinder edge of the frontal bone, so 

 as to be placed far behind the eyes, by their having a streak of 

 minute pores on the cheeks in the place of the usual tear-bag, and 

 in the hair of the forehead being elongated and forming a more or 

 less distinct tuft between the base of the horns. 



The horns are in the same situation as the hinder horns of the 

 four-horned Antelope of Asia, but that animal has a distinct crumen 

 or tear-bag, with a single opening. 



The specimens in the Museum form themselves into two very 

 distinct groups, characterized by the nature of the fur and the form 

 of the skull. On account of their habits, they are distinguished by 

 peculiar names by sportsmen, as the Duykers and the Bush-goats, 

 and we have in the Museum the skull of an animal from the Ga- 

 boon which appears to be intermediate between them ; but, unfor- 

 tunately, the animal belonging to this skull is unknown. 



I have referred to the ' Catalogue of Ungulata furcipeda in the 

 British Museum,' published in 1852; and there the synonyms will 

 be found at length. 



Col. Hamilton Smith figured in Griffith's ' Animal Kingdom,' 

 vol. iv. p. 183, a species which he called Antilope quadriscopa, from 

 a living specimen, said to have come from Senegal, and no specimen 

 like the figure has, to my knowledge, occurred again ; and knowing, as 

 I do, how very slight were the sketches and notes of my early teacher 

 and excellent friend, which he afterwards finished up into complete 



