380 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [Jail. 31, 



Length 2f inches ; breadth 2 inches in one direction, If inch in the 

 other. 



Spiral angle between 70° and 80°, rounded. 



Sutural angle varying in different parts of the whorl from 100° to 

 130°. 



Common in the upper beds of the hippurite limestone on the west 

 side of Lisbon. Abundant in the limestone beds of the subcretaceous 

 series at Condeixa; San Fagundo, ly league west of Coimbra; Sarjento- 

 mdr, ly league north of Coimbra ; in the cliffs of the Praia de Ma- 

 9ams near Cintra. 



This species is so close to T. globosum, that it is doubtful whether 

 they may not be identical ; but as we have only the casts to compare, 

 and there is a marked difference in the proportions of the two shells, 

 I have not ventured to unite them. T. ovatum is less globose, has 

 a higher spire and a broader aperture than T. globosum : there is 

 also less difference of breadth between its two diameters than in the 

 latter shell. 



Fig. 7. A cast from the subcretaceous beds. 



Fig. 8. A cast from the hippurite limestone. 



Notes on Remains of Fossil Reptiles discovered by Prof. Henry 

 Rogers of Pennsylvania, U.S., in Greensand Formations of 

 New Jersey. By Professor Owen, F.R.S., F.G.S. &c. &c. 



[Abstract of paper read January 31st ; see p. 329.] 



The paper descriptive of the series of fossils submitted to me in 

 November 1848 by Prof. Rogers, and read at the meeting of the 

 Society on the 31st of January 1849, has been unfortunately lost; 

 the rough notes taken on the inspection of the fossils have likewise 

 been mislaid, and I am compelled, therefore, in order that the benefit 

 designed by Prof. Rogers to English palaeontologists, by bringing over 

 the above collection of rare and valuable instructive fossils, should not 

 be wholly lost, to give now such notes as my restricted leisure will 

 permit of the specimens which have been selected for the subjects of 

 Plates X. & XI. 



Figures 1 to 4, in PI. X., are of cervical vertebrae of a Crocodile 

 or Alligator, constructed upon the same (procaelian) type as those of 

 the existing species : i. e. having the anterior surface of the body or 

 centrum concave and the posterior one (c, figs. 1 & 3) convex. 



The numerous vertebrae, cervical, dorsal, lumbar and caudal, of this 

 type, brought over by Prof. Rogers, were divisible into two series ; and 

 one of the most characteristic specimens of each of these series is here 

 selected to illustrate the difference, w'hich shows that there were two 

 species of the same genus as the modern Crocodiles or Alligators, 

 which left their remains in the greensand deposits of the United 

 States. The vertebra in question is one of the middle cervical, 

 probably the fourth or fifth, in which the parapophysis {ji) is still 

 near the lower part of the side of the centrum, the diapophysis (</) 

 wholly developed from the base of the neurapophysis (/i), and in 



