THE ANNALS 



AND 



MAGAZINE OF NATURAL HISTORY. 



[SECOND SERIES.] 

 No. 75. MARCH 1854. 



XVI. — Contributions to the Palceontology of Gloucestershire : — A 

 description, with Figures, of some new Species of Echinodermata 

 from the Lias and Oolites. By Thomas Wright, M.D. &c.. 

 Professor of the Natural Sciences in the Cheltenham Grammar 

 School*. 



[With two Plates.] 



Cidaris Edwardsii, Wright. PI. XL fig. 1, a-f. 



Test crushed, the form therefore unknown. Ambulacral areas 

 narrow, with two rows of small perforated tubercles, and 

 smaller perforated ones interspersed amongst them ; interam- 

 bulacral areas about four times the width of the ambulacral, 

 having two rows of large tubercles with confluent areolas ; the 

 primary spines long, with a compound structure; the secondary 

 spines short with blunt apices, the surfaces of both sculptured 

 with delicate longitudinal lines ; mouth armed with powerful 

 jaws, each with three prominent tricarinated ridges. Upper 

 part of the test and ovarial disc unknown. 



Description. — It is much to be regretted that no other speci- 

 men of this noble Urchin but the one before us has been ob- 

 tained from the Lias of Gloucestershire, and as the specimen 

 exhibits only the lower half of the test, many points of its ana- 

 tomy remain unknown; enough of its structure, however, is 

 shown to enable us to point out some important affinities and 

 differences in this rare species. 



The narrow ambulacral areas are provided with two rows of 

 small perforated tubercles, amongst which smaller tubercles are 

 irregularly scattered; these tubercles all support short stout 

 spines with a minutely sculptured surface, and which are abun- 



♦ Read at a Meeting of the Cotteswold Naturalists* Club, held at Chel- 

 tenham, May 4th, 1852. 



Ann. ^ Mag. N. Hist. Ser.2. Vol. xiil 11 



