220 



NOTES 



On Foreign Jurassic species of the genus STOMECHINUS, nearly allied to 

 British forms, but which have not been found in the English Oolites. 



Stomechinus multigranularis, Cotteau. Syn. JEchinus multigranularis, Cotteau. 



Etudes sur les Ecliinides Fossiles, pi. 7, figs. 6 — 8. 



Test conoidal, with inflated sides, and a sub-pentagonal circumference; ambulacra 

 narrow and prominent, with four rows of tubercles ; inter- ambulacra more than three times 

 as wide, with a naked median depression in the upper part of the area, and from eight to 

 ten rows of tubercles, irregularly disposed, in the widest part, diminishing to two rows 

 above ; tubercles nearly all of the same size, except at the base, w4iere they are 

 larger ; intermediate space filled with fine granules. Apical disc moderately large ; 

 genital plates pentagonal, with a granular surface ; vent sub-circular ; base flat ; mouth 

 opening very large, half the width of the test ; peristome decagonal, with ten wide, obtuse 

 notches, and small inter-ambulacral lobes between. 



Dimensions. — Height, one inch and seven twentieths ; transverse diameter, one inch 

 and three quarters. 



Formation. — Bathonien, Great Oolite, of Grimaux, Yonne : very rare. 



Collections. — M. Rathier ; a plaster mould in my cabinet. 



Stomechinus Vacheyi, Cotteau. Syn. 'Echinus Vaclieyi, Cotteau. E'tudes sur les 



Echinides Fossiles, pi. 3, figs. 12 — 16. 



Test small, depressed, and pentagonal ; ambulacra with two rows of tubercles ; inter- 

 ambulacra Avith two rows of primary tubercles, and a few scattered secondary tubercles ; 

 mouth opening large ; peristome with small notches. 



