576 Mr. Oray's Monograph on the CypraidoR. 



thick, raised, longitudinal, uninterrupted ribs ; the outer lip 

 rounded. As large as a walnut. 



A description and figure of this new species will appear in the 

 second Century of Mr. Koenig's valuable work above referred to, 

 which is now in the press. 



To complete this Monograph, according io my original inten- 

 tion, it would now be necessary for me to proceed to the des- 

 cription of the species of Ovula. My notes respecting these were 

 already prepared, when I was informed that Mr. G. B. Sowerby 

 was on the eve of publishing a Monograph of that genus. The 

 almost simultaneous appearance of a second work on the same sub- 

 ject would probably tend but little to the advancement of our 

 knowledge, especially as both must resemble each other closely, the 

 materials on which they are grounded being almost precisely the 

 same. Several of the species, moreover, which I should have noticed 

 as new, were furnished to me from Mr. Sowerby's cabinet, and as 

 thai gentleman was himself about to publish them, it would have 

 been uncandid not to allow him the opportunity of first describing 

 them. On these grounds I am induced to conclude here my 

 contributions on the species of Ci/prceidce, which must now be re- 

 garded as a Monograph of Ci/prcea alone. In that group I have 

 included the species of which I had proposed at the commence- 

 ment of this paper to constitute the genus CyprcBovnla. 



Some additional species which have fallen under my notice 

 since the publication of those sections of the genus to which they 

 belong, together with corrections, and references to other syno- 

 nyms, will form a useful Supplement to this undertaking, which I 

 am now preparing for a future number of the Journal. 



