100 Dr. T. R . Wright on a new Genus of Fossil Cidavidse. 

 Foreign Species of the genus Hemipediua. 



Hemipedina seriate , Wright. 



Diadema seriale, Agassiz ; Leymerie, Mem. de la Societe Geologique 

 de France, tome ii. p. 330. pi. 24. fig. 1, 1839 ; Agassiz and 

 Desor's Cat. raisonne des Ecliinides, 3 ser. tome vi. p. 348. 



Test hemispherical, subglobose above, flat below; ambulacra] 

 areas with two rows of tubercles nearly as large as those of 

 the intcrambulacra ; interambulacral areas with six rows of 

 tubercles abreast at the equator, diminishing to four and two 

 rows above ; a few secondary tubercles unequally distributed ; 

 mouth-opening small; peristome slightly decagonal. 



Locality. — Inferior Lias, France. 

 Coll. M. Michclin. 



Hemipedina Woodwardii, Wright. 



This species occurs in the Cornbrash of the Marquise, near 

 Boulogne-sur-Mer. In one of the specimens before us the spines 

 are preserved ; the primary spines are not very long, scarcely the 

 length of the diameter of the test; the secondary spines arc 

 short and needle-shaped ; the surface of both kinds is covered 

 with fine longitudinal lines. 



Locality. — The Cornbrash near Boulogne-sur-Mer. 



Coll. British Museum. 



Hemipedina Nattheimense, Wi-ight. 



Echinopsis Nattheimense, Quenstedt, Handbuch der Petrefacten- 

 kunde, p. 582. pi. 49. fig. 37. 



Locality. — White Jura, Nattheim. 



Coll. British Museum. At this moment the specimen is not 

 at our disposal. We shall give a diagnosis of this species in our 

 Monograph. 



Hemipedina Soemanni, Wright, nov. sp. 



Test small, hemispherical ; ambulacra with two rows of tubercles ; 

 interambulacral areas with one row of primary and two rows 

 of secondary tubercles, the primary tubercles alternating with 

 the secondary tul)ercles, not placed abreast as in most of the 

 species ; tubercles of both areas nearly the same size. 



Locality. — Coral Rag, Commercy, Meuse. 



Coll. Dr. Wright : sent by M. Louis Soemann of Paris. 



