T H E A N N A L S 

 MAGAZINE OF NATURAL HISTORY. 



[SECOND SERIES.] 

 No. 50. FEBRUARY 1852. 



VII. — On the Cassidulidae of the Oolites, with descriptions of some 

 new Species of that family . By Thomas Wright, M.D. &c* 



[With two Plates.] 



Since the publication of my paper t on the " Cidaridae of the 

 Oolites/' I have collected two Acrosalenia which are quite new, 

 and an Echinus of the same species as one occurring in the 

 Corallian stage of Besancon, but very rare as a British fossil. 



I now purpose describing these Cidaridse as a supplement to 

 that paper, before entering upon the study of the Cassidulidae, 

 which forms the subject of the present communication. 



Acrosalenia decorata%, Haime. 



Test hemispherical, depressed, outline subpentagonal ; ainbu- 

 lacral area? convex and prominent, the anterior and posterior 

 pair slightly sinuous, having two rows of small perforated 



* Read at Bredon, at the Meeting of the Cotteswold Naturalists' Club, 

 September 10, 1851. 



f Ann. and Mag. Nat. Hist. 2nd Series, vol. viii. p. 421. 



X I had given this Acrosalenia another specific name, but just as mv 

 MS. was about to be sent to press, I learned that it had been described 

 by M. Jules Haime, under the name Milnia decor at a, either in the ' An- 

 nates des Sciences Nat.,' or in the 'Bulletin de la Soc. Geologique de 

 France,' to neither of which works I can at present refer. I learn further 

 that Professor Forbes has had it drawn and engraved with all the details, 

 and will describe it in the forthcoming decade of his ' Memoirs of the 

 Geological Survey,' under the name A. decorata. I have therefore with- 

 drawn my name and the figure I had intended to give, as the multipli- 

 cation of specific names is at all times to be deplored, but more especially 

 so in our day, when a mania for the creation of species is so rife ; I have 

 therefore much pleasure in referring to the forthcoming decade of the 

 ' Memoirs ' for elaborate figures of the anatomy of the test of this beautifid 

 species. 



Ann. $ May. X. Hist. Scr. 2. Vol. \\. 6 



