from the Lias and Oolites. 19 
greater size and uniform perforation of the miliary tubercles, but 
above all by the form and structure of the primary spines. 
Having ascertained that our conjecture * relative to the spines 
of C. Fowleri is correct, from having seen a specimen recently 
found with some spines attached to it, we can speak positively 
upon this point. 
Locality and stratigraphical range—Found by Mr. G. E. 
Gavey, C.E., in the upper shale beds of the Lower Lias at 
Mickleton Tunnel near Chipping Campden. It was associated 
with Pentacrinus Goldfussii, Wright, Ophioderma Gaveyi, Wright, 
Uraster Gaveyi, Forbes, and Ammonites planicosta, Sow. 
History.—Isolated plates of this species have been found in 
beds of the same geological horizon in other localities of the 
county of Gloucester, but the specimen before us is the only 
one from which the anatomy of the Urchin could be made out. 
We dedicate this species to Prof. Milne-Edwards, of the Museum 
of Natural History at the Jardin des Plantes, Paris, as a tribute 
of gratitude for the pleasure and profit derived from the study of 
his admirable monograph on British Fossil Corals. 
Cidaris Bouchardii, Wright. PI. I. fig. 2, a-c. 
Test circular, depressed ; ambulacral areas narrow and flexuous ; 
interambulacral areas with two rows of primary tubercles, 5-6 
in each row ; the areolas of the small mammillary eminences 
deeply excavated, and surrounded by an elevated ridge, on 
which a distinct circle of granules for each areolar space is 
disposed. 
Dimensions of the largest specimen. Height 33ths of an inch, 
transverse diameter 1 inch and j5ths. 
Dimensions of a moderate-sized specimen. Height 14ths of 
an inch, transverse diameter 1 inch and ,%ths. 
Description.—It was for some time doubted whether the young 
forms of this Urchin were not the C. elegans, Goldf., but a com- 
parison of several individuals of our fossil with a typical spe- 
cimen of Goldfuss’s species, kindly sent us by our friend Dr. 
Roemer of Bonn, which he had identified with the original 
C. elegans in the Bonn Museum now under his care, has con- 
vinced us of their distinctness. The test of our Urchin is 
circular and much depressed from the great flattening of both 
poles ; the ambulacral areas are narrow and slightly flexuous, 
and have two rows of small marginal granules set nearly op- 
posite to each other throughout the areas. The poriferous 
avenues are much depressed, and the pairs of pedal pores are 
* Annals of Nat. Hist. Oct. 1851. 
c2 
