Rev. 0. Fisher — Glacial Action and Raised Sea-beds. 163 



7. Aporrhais cingulata, S. P. "Woodward. Strongly and regularly transversely 



ribbed, witbout tubercles or longitudinal costse. S. P. "Woodward claimed this 

 as a new species, but Pictet and Roux bad already figured a very similar Taut 

 imperfect specimen from the Gault under this name. 



8. Aporrhais, spec. nov. A small pupaeform species, with two keels on the body- 



whorl, and one keel on each of the remaining whorls, and marked with longi- 

 tudinal ribs wide apart. Anterior rostrated canal longer than the rest of the 

 test, and large-winged prolongations from the lip. 



9. Rostellaria, or possibly Fusus. Smooth but very finely transversely striated. 



All the specimens have the body-whorl imperfect, but have the prolonged 

 rostrated canal, 



10. Pteroceras retusa,^o^. Pteroceras bicarinata,D'Oih. An abundant and well- 

 marked species. 



£. marginatn, Sow., Geol. Trans., 2nd ser., vol. iv., pi. xi., fig. 18, is evidently 

 R. carinata. Both Pictet and Campiche and Pictet and Roux refer to 

 it, but figure a different species, with the ornamentation of a Gault Scalaria. 

 The rest of the species figured by D'Orbigny and other foreign writers do not 

 occur, as far as I can ascertain, in the Gault of Folkestone^ 



V. — On some Points connected with late Glacial Action and 



Kaised Sea-beds. 



By the Rev. 0. Fishee, M.A., F.G.S. 



MY thanks are due to Mr. Tiddeman for his reply to the letter 

 from me, which appeared in your February Number. I may 

 perhaps be allowed to add a few words more upon the subjects under 

 discussion. 



There is an error in my former letter, which gives a wrong 

 impression of my views upon the subject of the Trail. I origin- 

 ally used that word in 1866, to designate the disturbed ground 

 commonly found below the subsoil or warp. I am made to say that 

 it is " none other than the river gravels." I certainly intended to 

 write that " it is newer than the river gravels." 



Mr. Tiddeman is nearly correct in saying that I use the word in 

 question to designate the " till" of a particular period. More exactly 

 I use it to designate a particular accumulation of disturbed ground, 

 which certainly exists ; and I think it will be best to reserve the 

 name for that deposit. It expresses no theory about the causes 

 which produced it, but only implies that it has been dragged along, 

 which has evidently been the case. It is true that I myself regard 

 it as the moraine profonde of a particular period, to wit, of the last 

 covering of ice upon this country. I do not mean to imply, how- 

 ever, that this was of the age of the ice-sheet of Lancashire, but 

 simply wish to inquire whether it may not have been contem- 

 poraneous with the laminated clay of the Settle Cave ; not under- 

 standing Mr. Tiddeman as fixing the age of that clay. In it I think I 

 recognize an instance of ice-action subsequent to the cave-and-river 

 period, and fitting to my theory. My protest against the expression, 

 " The glacial period," was a general one, as too indefinite ; and I have 

 no intention of claiming the great ice-sheet (about which I am 

 not well informed) as synchronous with the Trail. For I suppose that 

 the marine glacial clay of Hollingworth, near Manchester, is one of the 

 deposits, newer than the ice-sheet, to which Mr. Tiddeman refers. 



