OF KACHH AND KATTYWAR. 85 



From the same locality are some specimens of more depressed types of this species, 

 and their breadth is unusual. It appears to be produced by an extra breadth of the 

 interambulacral plates at the ambitus, and there is an extra small tubercle to the orna- 

 mental part of the plate, and usually a corresponding vertical ridge ; but higher up in 

 the test the plates resemble those of the normal type. 



It is evident that some, but not all, of the tubercles are crenulated. 



Illustrations of the Species in Plate XIII. 



Fig. 14. The test : natural size. 



15. A plate near the ambitus: magnified. 



We restrict this form veithin the limits of Temnechinus, and do not see the neces- 

 sity of admitting the genus Opechinus, Desor. 



3, Temnechinus tuberculosus, d'Archiac & Haime, sp. Plate XIII, Figs. 16, 17. 



This species was well described in ' Les Animaux fossiles de I'lnde,' p. 206, and 

 figured ; but the specimen we have is not much crushed, and it is clear that the shape 

 of the test is turban-shaped, swollen at the margin and above it, and then tapering off 

 to a rather flat top. It is not pentagonal. 



The specific distinction is the presence of vertical processes which divide the ambu- 

 lacral fossettes into two. The interambulacral plates resemble those of the large plates 

 of the largest Temnechinus Bousseaui, d'Archiac, sp. (See our Plate XIII, Fig. 15.) 



Another distinction is the tumid body of the generative plates and their angular 

 extremity, which is perforated by a large pore. It is clear that some, but not all, of 

 the tubercles are excessively finely crenulate, as is the case in the exceptional plate of 

 the Temnechinus, fig. 15. 



Height 12-5 millim., breadth 19-5 millim. 



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

 east of Gurgat. Survey-number ^• 



Illustrations of the Species in Plate XIII. 

 Fig. 16. Part of an in terambulacrum and ambulacrum : magnified. 

 17. Diagrammatic section: natural size. 



A new species must be added to this list from Kattywar ; and as it allies Tem- 

 nechinus costatus, d'Archiac, to Temnechinus tuberculosus, d'Archiac, we have called it 

 Temnechinus affinis. It has slender oblique ridges, with large open fossettes in the 

 ambulacra, and the slender oblique costulation of the interradial plates is united by 

 vertical processes. In T. costatus the ambulacral ridges are stouter, and they are 

 stouter still in T. tuberculosus : in the first the fossettes are large and open, and in the 

 latter they are small and crossed by a vertical process. 



