432 



external to the orbit. The mandible is pierced by an oblong fissure outside the last molar 

 tooth. In the hind-foot the second, third and fourth toes are functional, with rudiments of 

 the metatarsals of the first and fifth. 



In this genus the first tooth above, and the first below, which is behind it, are developed 

 to the forms and proportions of canines. 



Prepared from a specimen presented by the Zoological Society of London. 



Order INSECTIVORA. 



Family Erinaceidee (Hedgehogs and Tenrecs). 

 Genus Erinaceus. 



Dental formula : i g, p g, m g=36. 



2388. The skeleton of a Hedgehog (Erinaceus europceus). 



The vertebral formula is: 7 cervical, 15 dorsal, 6 lumbar, 3 sacral, and 14 caudal. The 

 transverse processes of the last cervical are not perforated. All the processes are small 

 throughout the vertebral column, and offer no impediment to the free inflection of the spine. 

 The humerus is perforated between the condyles. The fibula coalesces with the tibia at its 

 distal end. The feet are plantigrade. 



Mus. Brookes. 



2389. The skeleton of a Hedgehog (Erinaceus europceus}. 



The vertebral formula is the same as in the preceding skeleton. 



Mm. South. 



2390. The head and trunk of a Hedgehog (Erinaceus europceus). 



The vertebral formula is : 7 cervical, 15 dorsal, 5 lumbar, 4 sacral, and 1 1 caudal. 



Hunterian. 



2391. The skeleton of a Hedgehog (Erinaceus europceus), vertically bisected. 



The cranial cavity so exposed shows the rhinencephalic compartment to be nearly equal in 

 size with the epencephalic one : the petrosal is impressed by a cerebellar fossa. The nasal 

 passage terminates behind in a hemispheric excavation of the basisphenoid ; and this bone 

 expands outwardly to form the floor of the tympanic cavity. The neural canal is widest in 

 the cervical region, contracts towards the middle of the back, and expands a little in the 



