with a Synopsis of the Species included therein. 123 
the surface. This appears to be identical with the type-spe- 
cimen in the Museum of the Geological Society. 
Locality. Lower Lias, Lyme Regis. 
Coll. J. 8. Bowerbank, Esq. 
Hemipedina Bowerbankii, Wright, nov. sp. 
Test crushed, 1,/,th of an inch in diameter ; ambulacral areas nar- 
row, with two rows of marginal tubercles rather smaller than 
those in the interambulacra, a tubercle on every alternate 
plate; interambulacral areas wide, with six rows of tubercles 
abreast, surrounded by a delicate scrobicular circle; spines 
shorter and thicker (43ths of an inch in length) than those of 
H. Bechei, although the test is much larger, deeply sculptured 
with longitudinal lines. 
Locality.—Lower Lias, Lyme Regis. 
Coll. J. S. Bowerbank, Esq. 
Hemipedina Jardinii, Wright, nov. sp. 
Test small, much depressed; ambulacral areas wide, with two 
» 
rows of marginal tubercles which extend from the peristome 
to the disc; interambulacral areas with two rows of tubercles 
set near the poriferous zones, from eleven to twelve tubercles 
in each row, a delicate scrobicular circle of granules around 
each, and a naked intertubercular space in the centre ; mouth- 
opening small, situated in a depression ; peristome decagonal ; 
base finely radiated in consequence of the size and regularity 
of the interambulacral tubercles. 
Locality.—Mar\lstone near Ilminster, Somersetshire, and Bre- 
don Hill, Gloucestershire. 
Coll. of the late H. Strickland, Esq., and Dr. Wright. 
Hemipedina Etheridgii, Wright. 
Pedina Etheridgii, Wright, Annals of Nat. Hist. S. 2. vol. xiii. p.315. 
pl. 1. fig. 5 a-d. 
Test small, circular, depressed ; ambulacral areas narrow, with 
six small perforate tubercles below, and a double row of mar- 
ginal granules above ; interambulacral areas with two rows of 
tubercles, seven in each row ; apical disc large and petaloidal ; 
mouth-opening small; peristome decagonal; lobes nearly 
equal. 
Locality.—Upper Lias, Ilminster. 
Coll. Dr. Wright. 
