130 Dr. T. Wright on some new species of Hemipediiia. 



ten rows of tubercles at the equator, each tubercular plate hav- 

 ing five tubercles abreast ; areolas surrounded by circlets of 

 small granules ; spines slender, sculptured with longitudinal 

 lines. 



Dimensions. Transverse diameter 2^ inches ? 

 Locality. Kimmeridge clay, Boulogne-sur-Mer. Collected 

 by M. Bouchard Chantereaux. 



Coll. M. Bouchard Chantereaux at Boulogne, 



In the present state of our knowledge it would be premature 

 to suggest subdivisions, but it is clear that we have two distinct 

 types in the genus Hemipedina : 1st, those with two rows of 

 large tubercles, and a wide intertubercular granulated space in 

 the middle of the interambulacral areas; and 2nd, those with 

 four, six, eight or ten rows of nearly equal-sized tubercles in 

 these areas at the equator. 



