G04 



DK. G. E. NICTIOLLS ON TJJE 



vertebral coluinn it would appear, then, that BoMa tigrina has 

 retained (or reverted to) a somewhat primitive condition. 



Text-fiaure 1. 



Tlie vertebral column <:i'i liana tigriiia, as seen from above. X 3. 



tt.f.L, aperture for Jilum terminale ; c, coccyx ; ep., epiphysis ; /., flange upon 

 the transverse process of the second vertebra, Il.t.p. 



It does not s'eem, however, that the occurrence of gaps 

 between the neural arches in i?. temporaria is to be attributed 

 simply to a notching of the arches between the zj^gapophyses. 



