ae Se eT 
Dr. T. Wright on some new species of Hemipedina. 129 
B. Species from the Kimmeridge Clay. 
Hemipedina Morristi, Wright, nov. sp. 
Form and size unknown; test small; ambulacral areas with two 
rows of regular prominent marginal tubercles gradually dimi- 
nishing in size from the base to the apex of the areas, and 
separated by a zigzag line of small granules down the centre ; 
poriferous zones slightly waved ; pores large, the pairs sepa- 
rated by thin septa; interambulacral areas more than three 
times the width of the ambulacral, with six rows of tubercles 
* at the equator, each plate supporting three nearly equal-sized 
tubercles abreast; bosses prominent; areolas surrounded by 
incomplete circlets of small granules. 
Spines referred to this species long, round, slender, and sculp- 
tured with delicate longitudinal lines; articulating cavity small, 
with a smooth rim; head thick, with a thin prominent finely 
milled ring ; body long, much more slender than the head. 
Locality. —Kimmeridge clay, Hartwell, Bucks. 
Coll. Professor Morris. 
Hemipedina Cunningtonii, Wright, nov. sp. 
Form unknown, upwards of an inch in diameter ; ambulacral 
areas with two marginal rows of very small tubercles rather 
irregular in their mode of arrangement; poriferous zones 
nearly straight ; interambulacral areas three times the width 
of the ambulacral, with two rows of tubercles situated on the 
zonal half of the tubercular plates, leaving thereby a wide in- 
tertubercular space which is filled with 8 to 10 rows of small 
granules; the bosses large and prominent, and the tubercles 
of a proportionate size; areolas surrounded by a complete 
circlet of small granules the same size as those filling the 
middle of the areas. 
Locality—Kimmeridge clay near Aylesbury. Collected by 
Professor Morris. 
Coll. British Museum. 
Foreign Species from the Kimmeridge Clay. 
Hemipedina Bouchardii, Wright, nov. sp. 
Test large, depressed ; ambulacral areas with two rows of re- 
gular marginal tubercles extending without interruption from 
the peristome to the apical disc, and separated by a median 
zigzag line of small granules ; poriferous zones straight ; inter- 
ambulacral areas three times the width of the ambulacral, with 
