390 GEOLOGY OF THE SOUTH EAST OF DORSETSHIRE. 



kas; Dr. J. A. Wagner, Munich), have therefore been omitted. 



I have excluded several North American species, referred 

 by authors to this genus, — such as Sciurus Grammurus, Sci. 

 lateralis, Sci. Clarkii, &c. — they being more properly refer- 

 red to Spermophilus ; as also Sci. quadrivittatus and Set; 

 Lysteri, which belong to the genus Tamias. 



Confining myself solely to species which I have personally 

 examined and compared, I have omitted several which have 

 been given by authors, and which may yet be detected. 



The specimen of Sciurus rufiventer described by Geoffroy 

 has disappeared from the Paris Museum, and the researches 

 of naturalists in Louisiana have not been successful in pro- 

 curing another specimen. It may prove to have been a young 

 animal, or a variety of some species already known. Sciurus 

 Lewisii, given by Griffith (Cuv. An. Kingd. vol. iii. p. 190), 

 escaped my notice in the Philadelphia Museum. The de- 

 scriptions I have seen of Sci. ludoviciatius, Curtis, being very 

 short and imperfect extracts from a work (Barton's Medical 

 and Phys. Journal) which I have had no opportunity of con- 

 sulting, prevented me from deciding on the species : it may 

 possibly prove to be the Sci. macrourus of Say, or the species 

 to which I have attached the name of Sci. Texianus ; in 

 the latter case his name will have the priority. 



Art. III. — Illustrations of the Geology of the South East of Dor- 

 setshire. By The Rev. W. B. Clarke, A.M., F.G.S. 

 No. III. — Studland. 



The map which is appended to the present number repre- 

 sents geologically and geographically the coast line of the 

 district, a portion of which is, in these illustrations, submit- 

 ted to examination. It is taken from the Ordnance survey, 

 with such observations added as appear necessary to make it 

 useful in this investigation, and with the succession of the 

 formations marked out by division lines, so as to serve gene- 

 rally for this and the preceding papers. 



The portion now to be considered is that which is compre- 

 hended between the points A and B in the map, from the 

 extremity of the chalk cliffs at Old Harry, to the commence- 

 ment of the sand hills between Studland and Little Sea. 



The extremity of these cliffs has already been figured, in 

 the diagram No. 39, vol. i., p. 418 ; and the continuation of 



