14 



inch. lin. 



Haunch plate, from it3 anterior to its pos- "1 2 10 

 terior margin above the tail. ... J 



Lengthoftail 6 9 



Circumference of its basai ring, from -vvhicli it 1 40 



rapidly tapers to a slender point J 

 Number of dorsal bands 7. 



In a small specimen of D. Peba, measuring from nose to root of 

 tail 1 foot 2|- inches, the ears measure lį inch in length; and in a 

 some'Nvhat larger specimen (from nose to root of tail, 1 foot 3 inches) 

 l§th inch. 



In the smaller specimen of D. Peha the extent of the shoulder plate 

 is 2| inches, — of the haunch plate 4 inches. 



The length of the head 3 y inches, and the distance from the an- 

 terior angle of the eye to the end of the nose, 2^ inches. 



Tail iraperfect, but much longer than in D. hybridus. 



Between D. hybridus and D. Peba, independently of the difFerences 

 in the proportion of the ears and length of snout, the characters ex- 

 hibited by the scutellcB of the platės are very distinct. In D. hybridus 

 the scufcHce of the helmet are of moderate size, those in the centre 

 of the upper part being elongated, and many sub-triangular, the ręst 

 occupying the space betvveen the eyes and down\vards are of an ir- 

 regular figure, some nearly square, others pentagonal and hexagonal. 

 In D. Peba the scutells are not only much larger, but of a more de- 

 finite figure, being mostly hexagonal, \vith sides of uneąual length. 



In D. hybridus the scutellce of the shoulder plate consist of ele- 

 vated oval tubercles in transverse ro-ws, the intervals being fiUed with 

 smaller, very irregular, and less elevated granuli. The šame obser- 

 vation applies to the haunch plate, in M'hich the elevated oval scu- 

 tellcc are remarkably distant and large, while somewhat smaller and 

 flatter scutella form a rosette round each. In the D. Peba the larger 

 scutellm of this plate are round, and are encircled by others of very 

 small size. 



In D. hybridus the ears are delicately granulated, — in D. Peba 

 coarsely. 



As respects the Das. minutus there can be no possibility of con- 

 founding it \vith the D. hybridus. 



Mr. James Reid exhibited to the Meeting, and characterized as 

 new, under the name of Obscurus, a dark-coloured monkey, from 

 the Society's coUection, belonging to the genus Semnopitheais. 

 The locality of the particular specimen before the Meeting \vas 

 unknown. 



