130 Mr. J. E. Gray on new genera and species of Spatangidae. 



the ChemnitsicB. I believe no example of a Rissoa with a similar 

 apical structure is known ; we may say that there is not a single 

 essential character of the Rissoa in this species. It is a congener 

 of Chemniizia excavata ; at one time I thought it a variety of that 

 species, but the dififerent disposition of the spiral strise, the more 

 oblique ribs and hollowed-out volutions in the C. excavata, point 

 out that the C. Barleei is probably distinct, though most closely 

 allied to it. The apex of C. excavata is precisely reflexed as in 

 this species : this character with me, as regards the Chemnitzia, 

 is of great value ; the exceptions to it are few ; in that tribe the 

 decided reflexed apex, or the sunken subreflexed one, I never 

 found absent, or present in a true Rissoa. But the examples 

 must be fresh and perfect — not the usual cabinet ones ground to 

 button-like apices by attrition ; but even in these the practised 

 eye will detect the true character. The fold on the pillar-lip of 

 the C. excavata is sometimes present, and at others absent. I 

 believe this remark holds good in this species, but in my speci- 

 mens from Mr. Barlee it is distinctly visible, though very small, 

 and far retired within the aperture. — W. C. 



XIII. — Descriptions of some new genera and species of Spatangidse 

 in the British Museum. By J. E. Gray, Esq., F.R.S., P.B.S. 



&c. 



The following genera and species do not appear to be included 

 in M. Agassiz and Desor's ' Catalogue Raisonne.' They wUl be 

 figured in the Catalogue of the Echinida in the British Mu- 

 seum : — 



Spatangus Regince. Purple ? subcordate ; back convex, larger 

 dorsal tubercles few and far apart, scattered, ambulacra! petals 

 broad. 



Hab. Malta. 



This species is very like S. purpureas, but the back is higher, 

 more convex, and there are not half the number of dorsal tu- 

 bercles found in that species. It was collected by Miss^'Emilie 

 AttersoU, who formed part of the suite of H.M. Queen Adelaide 

 during her visit to Malta. 



Eupatagus similis. Ovate, depressed, with only two or three 

 rather larger tubercles near the peripetalous fasciole. 



Hab. Australia, Flinders' Island. 



This species differs from E. Valenciennesii of Agassiz, t. 15. 

 f. 3, in not having nearly so many tubercles on the back. Several 

 specimens of it were sent to the Museum by Joseph Millington, 

 Esq. 



