322 



PROF. J. PIIESTWICH ON THE RAISED 



I have already described (antea, pp. 307-310) other forms of the 

 Hubble-drift in Kent. 



These do not exhaust all the phases assumed by this variable 

 drift, which includes the ' Head ' of De la Beche, the ' subaerial 

 beds ' of God win- Austen, the ' angular drift ' (in part) of Mur- 

 chison, the ' trail ' (in part) of 0. Pisher, the ' warp ' (in part) of 

 Trimmer, the ' gravels on slopes ' of Tylor, and various remnants, 

 which, in default of affinity with recognized drifts, have remained 

 unclassified. It is probable also that drift- deposits that have 

 been, for want of a better assignment, referred to some of the 

 river-drifts, may have to be transferred to this latter drift, but it 

 would lead me too far were I to attempt to follow it farther. My 

 object has been to give its main features, and to name the localities 

 where its special characters can best be seen and tested. At the 

 same time, from my inability to revisit all the ground since the ex- 

 planation I have to propose suggested itself to me, I may be mistaken 

 in some, but only a few, of the places I have included. 



The land fauna existing at the date of the Hubble-drift, or Head, 

 and Ossiferous Breccia is probably represented by the following 

 species. To all appearance, the mammalia, with possibly one or two 

 exceptions (*), were the same as those of the Gower Caves. 



Land Molltjsca. 



Bythinia tcntaculata. 

 Cyclostoma elegans. 

 HgUx concinna. 



hispida. 



■ nemoralis. 



pulcheLla. 



rufesc&ns (?). 



virgata. 



Limax agrestis. 



Elephas primigenius. 



antiquus. 



Rhinoceros tichorhinus. 



megarhinus*. 



Equ'us cabaU'us. 

 Bison prisacs. 

 Bos longifrcms. 

 - — primigenius. 

 Cervus capreolus, 



elaphus. 



megaceros. 



tarandus. 



LimncBa peregra. 



truncatula. 



Planorbis glaher, 



albus. 



Pupa niarginata. 

 Succinea putris. 



oblonga. 



Zua I'ubrica. 



Mammalia. 



Ovibos moschatus*. 

 Sus scrofa. 



Hippopotamus major. 

 Felis leo. 

 Canis lupus. 



vulpes. 



Hycena crocuta. 

 MusteLa erminea. 

 Ursus arctos. 



ferox. 



spelcBus, 



Of marine or freshwater shells there are none. 



§ 8. On the Origin op the ' Head ' or Rubble-drift. 

 Yarious explanations of the phenomena described in the pre- 

 ceding pages have been suggested, but none have embraced the 

 whole series, nor have they been of a nature to satisfy all the con- 

 ditions that arise from the assumed causes. 



