with a Synopsis of the Species included therein. 97 



Hemipedina Jardinii, ^\'right, iiov. sp. 



Test small, much depressed ; ambulacral areas wide, with two 

 rows of marginal tubercles which extend from the peristome 

 to the disc ; iuterambulacral 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. — Marlstone near Ilminster, Somersetshire, and Bre- 

 don Hill, Gloucestershire. 



Coll. of the late H. Strickland Esq., and Dr. Wright. 



Hemipedina Etheridgii, Wright. 



Pedina Etheridgii,Wn^t, Annals of Nat. Hist. S. 2. vol. xiii. p. 31.5. 

 pi. 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, Hminster. 

 Coll. Dr. Wright. 



B. Species from the Inferior Oolite. 



Hemipedina Bakeri, Wright. 



Pedina Bakeri, Wright, Annals of Nat. Hist. S. 2. vol. xiii. p. 312. 

 pi. 1. fig. 4 a-c. 



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. 

 Ann.i^ May.N.Hist. ^tx.2. Vol. xv\. 7 



