Dr. T. Wright on some new species of Heiniptdiiia. 129 



B. Species from the Kimmeridge Clay. 



Hemipedina Morrisii, \Vrigh t, nov. sp. 



Form and size unknown ; test small ; ambulacra! areas with t \\ < . 

 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 ; intri - 

 ambulacral areas three times the width of the ambulacral, with 



