with a Synopsis of the Species included therein. 125 



tubercles, eight in a row ; scrobicular circles neatly defined ; 

 mouth -opening small ; apical disc narrow and prominent. 



Locality. Pea-grit, Inferior Oolite, Crickley Hill. 

 Coll. Dr. Wright. 



Hemipedina Bonci, Wright, nov. sp. 



Test small, pentagonal, depressed; ambulacral areas with two 

 marginal rows of close-set tubercles; interambulacral areas 

 with one entire row and four short rows of tubercles, which 

 extend only as far as the equator; tubercles of both areas 

 about the same size ; base flat ; mouth moderate in dimen- 

 sions ; peristome unequally decagonal ; apical disc absent. 



Locality. Pea-grit, Crickley Hill. 

 Coll. Dr. Wright. 



C. Species from the Great Oolite and Cornbrash. 

 Hemipedina Davidsoni } nov. sp. 



Test much depressed, 1 inch in diameter ; ambulacral areas with 

 two rows of marginal tubercles very regular in their arrange- 

 ment throughout ; interambulacral areas wide, with two rows 

 of primary tubercles, fourteen in a row, and two rows of 

 secondary tubercles which extend beyond the equator, between 

 the former, and two rows of smaller tubercles between the 

 main rows and the poriferous zones, so that at the equator 

 there arc six rows of tubercles abreast, whilst on the upper 

 surface there are only two rows ; mouth-opening small, in a 

 concave depression ; peristome decagonal and nearly equally 

 lobed ; apical disc absent. 



Locality. The sandy beds of the Great Oolite, Minchin- 

 hampton. 



Coll. Dr. Wright : only one specimen known. 



Hemipedina Woodwardii, Wright, nov. sp. 



Test circular, much depressed ; ambulacral areas narrow, with 

 two rows of small tubercles below and extending as far as the 

 equator, diminishing to granules on the upper part of the 

 areas; interambulacral areas with two rows of rather large 

 primary tubercles, eight in a row, and two rows of secondary 

 tubercles, three to four in each row, which scarcely reach the 

 equator, the upper part of the intertubercular space being 

 filled with a small, abundant miliary granulation ; apical disc 



