Revieics — Clement Reid — Geology around Bognor. 329 



between the distal element named dorso-central and the other 

 elements of the stem. W. B. Carpenter's refusal to recognize 

 a morphological distinction between cribriform and fasciculate 

 stereom has already been quoted. That there is no physiological 

 distinction between these elements, in Antedon itself, is seen by 

 reference to the figures of A. Sarsi published by M. Sars.^ These 

 show that any columnal could form encrusting or lobate extensions 

 over adjacent objects. Except as a misleading and highly confusing 

 appellation for the primitive distal columnal, there is therefore 

 no virtue in the term ' dorso-central.' 



This conclusion does not affect the main thesis of Wachsrauth and 

 Springer, that the majority' of Palaeozoic crinoids were not per- 

 manently attached. " A permanent fixation of the Crinoids would 

 perhaps restrict the geographical range of the species, whereas we 

 know that some of them have a very wide range. A majority of the 

 species from the Lower Burlington group at Burlington are found 

 almost unaltered in the south-western part of New Mexico, and 

 some in Arizona, and many species of the Keokuk group have been 

 traced from Southern Iowa as far down as Alabama. And we find 

 in Scotland and Eastern Eussia, with but slight modifications, the 

 same forms which flourished in the Mississippi Valley during the 

 epoch of the Kaskaskia group" (p. 52). 



The important question of the orientation of the stem is best dealt 

 with in connection with the structure of the base of the cup, which 

 will be discussed in the next Notice. F. A. Batheu. 



{To be continued.) 



II. — The Geology of the Country around Bognor. By 

 Clemknt Reid, F.L.S., F.G.S. Memoirs of the Geological 

 Survey. 8vo ; pp. iv, 12, with 14 illustrations. (London, 1897. 

 Price Qd.) 



THIS little memoir has been prepared to illustrate the New Series 

 Map Sheet 332, embracing that part of the Sussex coastline 

 which projects in Selsey Bill and includes the favourite seaside 

 resorts of Bognor and Littlehampton. The most interesting features 

 in the geology are in connection with the Brackleshain Beds, which 

 being exposed only on the foreshore must be studied at low-water 

 spring-tides ; then "one sees laid bare some of the finest exposures of 

 fossiliferous strata visible in England." Several of the characteristic 

 fossils are figured in this memoir, which should prove a useful guide 

 to the student. The Pleistocene deposits with their far-travelled 

 erratics also possess many points of interest on which Godwin- 

 Austen very many years ago, and the author more recently, have 

 thrown much light. 



1 "Memoires . . . . des Crinoides vivauts " : Progr. Univ. jSTorvege ; 

 Cliristiaiiia, 1868. See pi. v, figs. 9, 12, 13, 15. 



