THE PLAT ANA (Xenopus Icevis). 



THE FROG (Bana fuscigula): 



First Day. 



External Characters. 



1. Make a drawing of the animal viewed from above, showing : — 



(a) The nostrils. 



(b) The eyes. 



(c) The nictitating membrane and a short tentacle beneath the 



eye. [The tentacle is absent in the Frog.] 



(d) The tympanic membrane, which is not shown in the Platana, 



but is well marked in the Frog. 



(e) The opening of the cloaca. 

 (/) The limbs and their divisions. 



(g) The skin with tube-like lines round the body. [In the Frog 

 these lines are not present.] 



Fig. 1. — Xenopus lasvis and Rana fuscigula. 



2. Make an enlarged drawing, about twice the natural size, showing : — 



(a) The fore-limb with the digits. 



(b) The hind-limb with the digits. The inner three digits have 



claws, j The claws are absent in the Frog.] 



Name the parts of these limbs, and number the digits from within out- 

 wards, noting that the first is absent in the fore-limb. 



