224 FOREIGN JURASSIC STOMECHINI. 



Dimensions. — Height, four tenths of an inch ; transverse diameter, three quarters of 

 an inch. 



Formation. — " CoralHen infer. (Terrain a Chailles) du Fringeli (Jura Soleurois)." Desor. 



Collection. — M, Gressly. Very rare. 



Stomechinus lineatus, Goldfuss. Syn. Echinus lineatus, Goldfuss. Petrefacta 



Germanise, tabl. 40, fig. 11. 



Test hemispherical, depressed, circular, or shghtly sub-pentagonal ; ambulacra with 

 two rows of tubercles on the margins, and two small rudimentary rows internal to them ; 

 inter-ambulacra with six rows of tubercles at the circumference, diminishing to two rows 

 above ; tubercles of both areas prominent, and nearly of the same size ; bosses encircled 

 with granules ; the general surface is very tuberculous. 



Dimensions. — Height, one inch ; transverse diameter, one inch and three quarters. 



Formation. — From the Coral Rag of Regensburg and Basel. The specimen kindly sent 

 me by M. Michelin is from the Coral Rag of Niederdoff, Canton de Bale. 



Collections. — Museums of Tubingen, Besanpon, Munich, collection of M. Michelin. 

 Royal College of Surgeons (Hunterian Collection), my cabinet. 



Stomechinus perlatus, Desmarest. Syn. EcJiinus perlatus, Agassiz. Echinoderm. 



Foss. Suisse, part ii, pi. 22, figs. 13 — 15. 

 Knorr. Petrefact., ii, tab. e, figs. 1, 2, 



Test conoidal, sub-circular, or sub-pentagonal ; the transverse and bucco-anal diameters 

 are sometimes nearly equal ; ambulacra with two complete rows of tubercles on the mar- 

 gins, two incomplete rows within, and numerous small granules encircling their bosses ; 

 inter-ambulacra with ten rows of small tubercles at the circumference, two rows of which 

 are larger, and extend from the peristome to the disc, the others disappear on the upper 

 surface ; the bosses of all the tubercles are surrounded by fine granules, which imparts a 

 highly sculptured appearance to the test of this species ; poriferous zones narrow, trigemi- 

 nal ranks, form angles of 50° to 55°; apical disc moderate, ovarial plates lai'ge ; mouth 



