60 FOREIGN OOLITIC CIDARUm 



Formation. — Collected by M. De Loriere from the etage Bajocien, departement de 

 Sarthe. 



Collection. — My Cabinet. 



This species comes very near to Cidaris Foioleri ; but it is distinguished from that 

 species by its pyriform figure, the circle of minute scrobicular granules, the wide areolas, 

 broad and deeply crenulated bossal summits, and wide and deep perforations in the 

 tubercles. These characters closely resemble those of Cidaris co?ifluens> with which it has 

 many affinities. 



Sent me most kindly by M. De Loriere, to whom I dedicate this fine new species. 



C. Species from the Coral Mag. 



Cidaris Blumenbachii. Miinst., in Goldf., Petrefacten, p. 117, t. 39, fig. 3 a, b (testa 



non aculei). 

 Agassiz, Echinodermes Suisses, part ii, p. 57, t. 20, figs. 2 — 6. 

 Cotteau, Etudes sur les Echinides Eossiles, p. 108, t. 10, fig. 6? 



Test inflated, depressed at both poles ; ambulacra narrow and flexuous, with two rows 

 of small, very close-set granules ; poriferous zones narrow ; pores small, round, contiguous, 

 from 20 to 22 pores opposite one of the largest tubercular plates; areolas large, nearly 

 circular, deeply excavated, six to seven in each row, with a prominent margin; boss small, 

 summit broad, deeply crenulated; tubercle small and prominent; scrobicular circles complete, 

 margins touching, granules scarcely larger than those filling the wide miliary zones. Spines 

 not known, those referred to this species I have proved to belong to Cidaris jlorigemma. 



Formation. — Coral Rag. 



Localities. — Besancon, Chatel-Censoir, et Druyes, Yonne ; Saint-Mihiel, Vaches-Noires. 

 Corallien blanc de Hoggerwald, Canton de Soleure. 

 Jura superieur, Jurakalkes bei Thurnau und Muggendorf, Bavaria. 

 Formation t, Quenst., Sigmaringen. 



Collections. — British Museum ; very rare in English Collections ; in almost all the 

 Foreign Collections ; my Cabinet. 



Cidaris Parandieri. Agassiz, Echinodermes Foss. Suisse, ii, p. 58, t. 20, fig. 1. 



Test inflated ; ambulacra narrow, with two rows of granules at the base, and some- 

 times two other intermediate rows — four rows in the middle ; the areolas, bosses, and 

 tubercles similar to the preceding species, of which it appears to be only a variety. 



