126 Dr. T. Wright on a new Genus of Fossil Cidaride, 
large, anal rim prominent ; mouth-opening small ; peristome 
decagonal, nearly equal-lobed. 
Locality—Cornbrash, Wiltshire. 
Coll. British Museum, from Dr.Smith’s collection ; Dr. Wright. 
Hemipedina tuberculosa, Wright, nov. sp. 
Test elevated, subconoidal ?, the precise form unknown ; ambu- 
lacral areas with two rows of basal semitubercles raised on 
very prominent bosses diminishing rapidly in size into coarse 
granules above ; interambulacral areas with two rows of large 
tubercles set on very prominent bosses, with scrobicular circles 
of coarse granules surrounding the areolas ; two rows of small 
secondary tubercles close to the poriferous zones from the 
peristome to the equator, and three or four at the base of the 
intertubercular space ; upper surface enveloped in the matrix ; 
apical aperture large. 
Locality.—Coral Rag, Wiltshire. 
Coll. British Museum. 
Foreign Species of the genus Hemipedina. 
Hemipedina seriale, Wright. 
Diadema seriale, Agassiz ; Leymerie, Mém. de la Société Géologique 
de France, tome ii. p. 330. pl. 24. fig. 1, 1839; Agassiz and 
Desor’s Cat. raisonné des Echinides, 3 sér. tome vi. p. 348. 
Test hemispherical, subglobose above, flat below; ambulacral 
areas with two rows of tubercles nearly as large as those of 
the interambulacra ; 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. Michelin. 
Hemipedina Woodwardiu, 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 are 
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. 
