482 Woodward and Etheridge — On Dithyrocaris. 



■until soon the Weymoutli Backwater would be invaded, and tlien its 

 eastern portion would become a small estuary, inclosed on one side 

 by a beach, exactly as the Eleet is now. 



Under this theory the denudation problem is reduced to the form- 

 ation of estuaries in general, such as we find at Weymouth, 

 Lodmore (almost silted up, and screened by its own beach), Poole, 

 Southampton, and so on. They are all the drowned ends of valleys, 

 excavated at a remote period, when the land stood higher than it 

 does at present, and which was probably long antecedent to that 

 during which the submarine forests, which occur on most low shores, 

 were flourishing. 



Such a mode of origin for the Fleet would support the view of the 

 great antiquity of the present surface contour, evidenced in this, as 

 in other instances, by the extensive tracts of land which must have 

 since disappeared. This is proved by the abrupt manner in which 

 the general form of the surface is cut off by the sea-board ; pre- 

 senting either lofty cliffs, low shores, or estuaries, which depend 

 solely upon the already existing form of the ground at the limit to 

 which the sea has advanced. 



II. — On some Specimens of Ditjstrocaris from the Caeboniferous 

 Limestone series, East Kilbride, and from the Old Eed 

 Sandstone of Lanarkshire. 



By Henry Woodward, F.R.S., F.G.S., etc., 



of the British Museum, and 



EoBERT Etheridge, Jun., F.G.S., etc., 



of the Geological Survey of Scotland. 



(PLATE XVI.) 



THE nine specimens of Phyllopodous Crustacea about to be 

 noticed are, with one exception (that from Lanarkshire), all 

 from the undoubted Carboniferous Limestone series, East Kilbride, 

 a locality already well known to local geologists as having yielded a 

 very rich series of Carboniferous forms. 



The specimens from East Kilbride were collected by Mr. A. Paton 

 and Mr. J. Bennie, that from the Old Ked of Lanarkshire by Mr. 

 A. Macconochie. 



They are all referable to the genus Dithyrocaris, of Soouler 

 (originally named by him Argas^), and with two exceptions are new 

 species. 



1. DrTHYROCARTS TESTUDiNEus, Scouler (Plate XVI. Fig. 1), — 

 syn: Dithyrocaris Scouleri, M'Coy. Carb. Foss. Ireland, t. 23, fig. 2. 



The specimen which we refer to this species was obtained from shale 

 over the Main Limestone at quarries on North Lickprivick Farm, 

 near East Kilbride, and presents us with half of a carapace,^ which, 



1 Records of General Science, by Dr. R. D. Thomson, 1835, vol. i. p. 136. 



2 Probably the other half of the carapace has been folded beneath it, as the 

 posterior margin seems to be doubled. ^ 



