﻿FROM THE CORALLINE OOLITE. 



403 



et Pisolitique" of Clmtel-Censoir, and of Coulanges-sur-Yonne, where it is very rare ; it is 

 found more frequently in the " Couches Coralliennes superieures" of Baily, of Thury, and 

 of Tonnerre ; the specimens collected from the latter locality by M. Rathier were in fine 

 preservation, and were nearly as large as those found at Thury. 



This species has likewise been found by MM. Cotteau and Royer in the " Calcaires a 

 Astartes de l'Aube et de la Haute-Marnes." 



The original German specimen was found, according to Koch and Dunker, in the 

 " krystallinischen Dolomitquadern des oberen Korallenkalkes am Waltersberge bei 

 Eschershausen."* 



Professor Roemer kindly sent me a specimen of Pygurus Blumanbachii, Koch, which 

 was collected from the so-called Portland-Kalk, zone of Pterocera Oceani, at Hildesheim, 

 Hanover. This rock Dr. Oppel f considers to be the equivalent of our Kimmeridge clay, 

 and not of the true Portland stage. The occurrence of this urchin in the zone of Pterocera 

 Oceani strengthens my learned friend's opinion, as MM. Cotteau and Rathier have 

 already found it in the " Calcaires a Astartes," in l'Aube, and Haute-Marne, which 

 is the true equivalent of the Astaitekalke of Lindener Berg, and of the environs of 

 Hildesheim. 



Pygurus Phillipsii, Wright, nov. sp. PI. XXXIX, fig. 1, a, b, c, d. 



Pygurus Phillipsii. Wright, Report on British Oolitic Echinodermata, British Associa- 

 tion Reports, p. 402, vol. for 1856. 



Test nearly orbicular, rather longer antero-posteriorly than transversely; rounded 

 before, slightly produced behind ; upper surface very much depressed ; sides rounded ; 

 anal valley very near the border ; ambulacral areas narrow ; poriferous zones petaloid on 

 five sixths of the dorsal surface ; apical disc small, nearly central, four rows of tubercles 

 on the large plates ; inter-ambulacra with slight central triangular elevations, which 

 occasion corresponding tumidities at the border ; anal valley wide and deep, causing an 

 emargination of the posterior border. 



Dimensions — Height, one inch; antero-posterior diameter, nearly four inches; trans- 

 verse diameter, three inches and three quarters. 



* Norddeutsch. Oolitligebildes, p. 38. 

 f Die Juraformation, p. 763. 



