516 RHYNCHOCYON AND PETRODROMUS CHAP. 
are five fingers and toes. There is a caecum as in but few 
. . 1 - 
Insectivores. The tooth formula, as revised by Thomas, is 
ue 9 3 
I3 Ci Pm# M 54-5 the total number being thus forty or 
3 ] 4 Ola 5 
forty-two. There are several species of this genus. 
Fig. 250.—Rhynchocyon chrysopygus. x4. (After Giinther.) 
Rhynchocyon and Petrodromus differ from Macroscelides in 
not having such long hind-legs. The dental formula of the 
first is [1-9-2 C+ Pm + M2= 34 or 36, of the latter 13 C14 
Pn+ M2=40. In Petrodromus the toes are reduced to four; 
in Lhynchocyon there are only four digits in the manus as well 
as in the pes. This animal, as its name implies, has a longish 
proboscis, which can be bent, and is really very like a miniature 
Elephant’s trunk, and also like that of the Desman (J/yogale). 
It has thirteen pairs of ribs, and a well-developed caecum. Dr. 
Giinther has pointed out that in Petrodromus tetradactylus the 
hairs of the lower part of the tail are stiff elastic bristles 5 mm. 
long, with a swelling at the free tip. The use of this singular 
modification is not at all apparent. Pseudorhynchocyon, ot 
European Oligocene, is believed to be related to this family. 
Fam. 8. Talpidae.—This family is confined to the Palaearctic 
and Nearctic regions, or practically so, being fairly equally dis- 
1 “Mammals collected by Dr. Emin Pasha,” in Proc. Zool. Soc. 1890, p. 446. 
