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 perforated as in Erinaceus (it is not so in Gymnura and Hylomys), but on the whole it comes nearest to Hylomys.

'''Fam. 2. Tupaiidae.'—This family contains the genera Tupaia and Ptilocercus''. Tupaia is Oriental in range, extending as far east as Borneo. There are a dozen or so of species, which are generally arboreal and have the outward aspect of Squirrels. It has been suggested that this is a case of mimicry, the animal gaining some advantage by its likeness to the Rodent. The name Tupaia, it should be added, means Squirrel, and the long-nosed Squirrel, Sciurus laticaudatus, is so extraordinarily like it that "one has to look at the teeth" to distinguish them. Moreover this Squirrel, like some Tupaias, lives largely on the ground among fallen logs. Tupaia resembles a Lemur in the complete orbit. The dental formula is I 2/3 C 1/1 Pm 3/3 M 3/3 = 38. The sublingua, too, is stated by Garrod to be like that of Chiromys. There is a minute caecum in T. belangeri, none in T. tana.

Ptilocercus has a pen-like posterior portion to the tail, a modification which is found in other groups of animals. The tail of certain Phalangers, for instance, shows this same modification. The rest of the tail is scaly. The animal, as was pointed out by Dr. Gray, looks very much like a Phalanger. The orbit is entire as in Tupaia. The fingers and toes are five. The one species, called after Sir Hugh Low, G.C.M.G., P. lowi, is a Bornean animal.

'''Fam. 3. Centetidae.'''—This family is entirely confined to the Island of Madagascar. It includes some seven genera. The best-known genus is Centetes. C. ecaudatus, the Tanrec, Tenrec, or Tendrac, is an animal a foot or so in length, without a tail, and with forty-four teeth. The immature animal is so different from the parent as to appear quite a different form. It has three narrow rows of spines along the back, which do not wholly disappear until the permanent dentition has been acquired. Even then the hairs are of a rather spiny character, particularly those upon the back of the head, which are erected when the animal is