124 Dr. T. Wright on a new Genus of Fossil Cidaride, 
B. Species from the Inferior Oolite. 
Hemipedina Bakeri, Wright. 
Pedina Bakeri, Wright, Annals of Nat. Hist. S. 2. vol. xiii. p. 312. 
pl. 1. fig. 4 a-e. 
Test circular, depressed ; ambulacral areas very narrow, with two 
rows of small tubercles set so far apart that they form a zig- 
zag row; interambulacral areas with two rows of rather large 
prominent tubercles, five in a row; apical disc with a pro- 
minent anal rim; mouth-opening large; peristome deeply 
decagonal. 
Locality.—Pea-grit, Inferior Oolite, Crickley Hill. 
Coll. Dr. Wright : a single specimen. 
Hemipedina perforata, Wright. 
Goniopygus’ perforatus, Wright, Annals of Nat. Hist. 8. 2. vol. viii. 
p- 267. pl. 6. fig. 5 a—d. 
Test small, circular and depressed ; ambulacral areas with two 
rows of small tubercles which extend from the peristome to 
the disc ; mterambulacral areas with two rows of tubercles, 
seven to eight in each row, three or four secondary tubercles 
between the primary rows at the base; surface of the plates 
covered with numerous coarse miliary granules ; mouth-open- 
ing large; peristome rather deeply decagonal ; lobes nearly 
equal in size ; apical disc large and foliated. 
Locality.—Pea-gnit, Inferior Oolite, Crickley Hill. 
Coll. Dr. Wright. 
Hemipedina tetragramma, Wright, nov. sp. 
Test circular, ;9,ths of an inch in diameter; ambulacral areas 
narrow, with two marginal rows of small nearly equal-sized 
tubercles extending from the peristome to the disc; interam- 
bulacral areas with two rows of primary tubercles, about four- 
teen in each row, and two rows of secondary tubercles, ten in 
each row, extending from the peristome to nearly the upper 
surface; mouth-opening small, situated in a depression ; 
peristome decagonal, unequally lobed. 
Locality.—Pea-grit, Crickley Hill. 
Coll. Dr. Wright. 
Hemipedina Waterhousei, Wright, nov. sp. 
Test small, pentagonal, rather inflated at the sides ; ambulacral 
areas with two rows of small tubercles extending from the 
peristome to the disc ; interambulacral areas with two rows of 
