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. S. Bowerbank, Esq. 



Hemipedina Bowerbankii, Wright, nov. sp. 



Test crushed, l^th of an inch in diameter ; ambulacra! 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 (^ths 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. Marlstone near Ilminster, Somersetshire, and Bre- 

 don Hill, Gloucestershire. 



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



Hemipedina Etheridgii, Wright. 



PedinaEtheridgii, Wright, Annals of Nat. Hist. S. 2. vol. xiii. p. 3 15. 

 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, Ihiun>u T. 

 Coll. Dr. Wright. 



