80 THE TERTIARY FOSSIL ECHINOIDEA 



VIII. Description of the Fossil Echinoidea from the TeHiaries of Kattywar. 



(Miocene.) 



Order ECHINOIDEA ENDOCYCLICA. 



Family CIBARIBM ■ 

 Genus CIDARIS, Klein, 1734. 



1 ; CiDAEis DEPRESSA, Duncan & Sladen. Plate XIII, Figs. 1-3. 



The test is very depressed and broad, the peristome is small, and the ambulacra 

 sinuous and broad. 



The poriferous zone is much broader than the interporiferous area ; the pores are 

 separated by a raised ridge, but the pairs have only the sutural line between them. A 

 vertical row of small secondaries is on each side in the interporiferous area, just beyond 

 the poriferous zone. A minute tubercle is also found .close to each one of the vertical 

 series. There is thus a large and small tubercle to each plate. The interradial plates 

 are broader than long ; the tubercle occupies much of the surface, and is nearer the 

 poriferous edge than the median line ; the boss is low, with a depressed small-necked 

 mamelon. There is no crenulation, but the mamelon is perforate. There is a row of 

 well separated small secondaries around the scrobicular area, and two rows of smaller 

 ones nearer the median line. Actinally and abactinally there is only the solitary row, 

 which is sometimes incomplete ; and a row of very small tubercles is between those of 

 the scrobicular circle and the poriferous zone. 



Locality. Kattywar Miocene. Three miles east by north of Gaga, and south-east of 



TT 1 



Gurgat. Survey-number -^ . 



Illustrations of the Species in Plate XIII. 



Fig. 1. The test : natural size. 



2. Two ambulacral plates : magnified. 



3. Diagram of a section of an ambulacral plate. 



2. CiDAEis GT5A2JULATA, Duncan & Sladen. Plate XIII, Figs. 4-6. 



The test is broad and depressed. The ambulacra, moderately wavy, are broad, 

 especially in the interporiferous area ; the pores are separated by a raised ridge, and 

 there is a raised narrow linear ridge between the pairs. A small tubercle is close to 

 the inner pore, and towards the median line there are two others, the inner being the 

 smallest. There are thus six vertical rows of tubercles in the interporiferous area. 

 There are ten pairs of pores in relation to one side of an interradial coronal plate. The 

 larger interradial plates are broader than long, well defined by the sutures ; and the large 

 and broader than long boss occupies the greater part of the plate, and is placed rather 



