Strata near Swarvwicli. 587 



black ; beneath, rufous. Ears very long ; hinder part of end black, and 

 black-edged ; front edge longly ciliated with pale brown hairs. Under fur 

 of the back pale grey; above, brown, with black tips. Hairs of the back 

 enlarged at the tip, black, with a broad subcentral pale band. Soles 

 and palms very hairy, brown. Nape, and hinder edge of ears, whitish. 

 Upper cutting teeth rather narrow, converging, with a deep groove, rather 

 on the inner edge of the middle of the tooth. Length, 23 in.; ears, 

 6 in.; tail, 4Jin.; hind feet, 5 in., Var. whiter, the ring of the hairs 

 whiter. 



Inhabits California, St. Antoine, in May. 

 Boa brachyceros Gray. Forehead broad, flat. The horns rather short, 

 very strong ; flattened in front, at the base ; rounded behind ; diverging 

 on each side, scarcely bent back ; the apices bent forwards, and slightly 

 incurved. Fur brown. 



Inhabits Central Africa. «*r Captain Clapperton. British Museum. 



The horns are somewhat like those of the short-horned varieties of the 

 buffalo ; but they are shorter and thicker, and not bent back : as they are 

 in all the varieties of that species. 



Art. V. On the Strata near Swanxvich, in the Isle of Purbeck. 

 By James Mitchell, LL.D., F.G.S , &c. 



I am induced to send you a few remarks on a paper, in your 

 Number for August, " On the Geology of the South-East 

 Dorsetshire ;" because it appears to me that the writer has, in 

 some instances, fallen into errors himself, besides trusting too 

 implicityto the authority of those persons who have previously 

 written on this part of the coast. I shall make no remark on 

 the discursive preliminary matter, but confine myself exclu- 

 sively to what he has given as the description of the strata 

 from Durlstone Head to Standfast Point, or, as he calls it, 

 the point of Old Harry and his Wife. 



The following are the words of the passages, and for the 

 woodcuts, I refer to p. 417, 418, and 419. 



" In illustrating the particular phenomena presented by the 

 section of the vertical chalk at Ballard Head, near Svvanwich, 

 it will be necessary to represent, by woodcuts, the general 

 features of the locality. On approaching from the sea the 

 eastern termination of Purbeck, the coast appears as repre- 

 sented in Jigs. 35. and 36.; the latter being merely a con- 

 tinuation of the former. 



" In Jig. 35. the overhanging, dark, curved strata and 

 breccia of Purbeck stone at Durlstone Head, the highly 

 inclined red cliffs of Hastings sand in Swanwich Bay, and 

 the commencement of the chalk cliffs ranging from Ballard 

 Head, are sufficiently represented to show the order of suc- 

 cession and inclination of the separate formations. Fig. 36. 



