34 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [NoV. 22, 



the modern high-water mark, could not, for want of time, be exa- 

 mined. But the above-mentioned appearances cannot have resulted 

 from the wash of rough seas, or " rollers " like those common at 

 Ascension and St. Helena (but unknown here), and were doubtless 

 formed when the islands were deeper in the water. 



Darwin believes in a gradual rising of the Brazils, and of the 

 South-American continent in general. Have these corresponding 

 phenomena any connexion ? Or are either, or both, related to the 

 reported appearances of volcanic eruptions, even so late as 1836 (as 

 indicated in our most trustworthy maps) in the middle of the Atlantic, 

 some 16° to the N.E. of Fernando Noronha, close to the equator, 

 and midway between the Brazilian and African coasts ? 



The correlation of the rocks of this group, and the minutiae of their 

 geology must be left to future investigators. 



3. Note on some Ichthtosaitrian Remains from Kimmeridgb Bay, 

 Dorset. By J. W. Hflke, Esq., F.E.S., F.G.S. 



[Plate II.] 



These remains consist of several teeth and of fragments of a skull 

 transmitted to me for examination last summer by J. Mansel PleydeU, 

 Esq., F.G.S., to whom I have been already indebted on several occa- 

 sions for opportunities of bringing under the Society's notice Saurian 

 fossils from the Dorsetshire Elimmeridge beds. Unfortunately, as 

 so commonly happens when the extrication of fossils from the shale 

 is attempted by unskilled labourers, the bones were smashed into so 

 many pieces as to render the restoration of the skull quite impos- 

 sible. Estimated by the size of the broken pieces, the snout was 

 probably not less than three feet long, and it was proportion- 

 ately stout. Of the teeth some are shorter, more curved, and re- 

 latively stouter than the others. In both forms the crown is bluntly 

 pointed, its base passes evenly into the root without any separating 

 cingulum, and the proximal end of the root is laterally compressed, 

 which gives its cross section an oblong figure (fig. 8), the longer sides of 

 which are parallel with those of the dentary groove. The crown is 

 strongly striated ; the striae diminish regularly from the base to the 

 apex, near which they break up into lines of minute tubercles, which 

 are continued to the very extremity. The most perfect of the longer 

 teeth (only the extreme tip of the crown of which is missing) is 30i 

 lines (English) long, of which the crown forms 8-^ lines (figs. l-3j. 

 The base of its crown has an antero-posterior diameter of 5|- lines 

 nearly, and a rather smaller transverse diameter. At the middle of 

 the root these diameters are 8g lines and 6 lines nearly, while those 

 of the proximal end are slightly less. The inner surface of this jDart 

 of the root has in several of the teeth been hollowed by an advancing 

 germ (fig. 3). The entire length of a perfect tooth of the shorter 

 form (figs. 4 & 6) is 20 lines ; but some of the broken ones were 

 slightly longer. The crown of this tooth is Sg lines long ; and the 



