48 THE TERTIAEY FOSSIL ECHINOIDEA 



front of the anus. The peristome is at the anterior two sevenths of the great axis. 

 Good-sized tubercles are on the lateral interradia. 



The authors add, " Nous n'avons pas pu nous assurer completement de la presence 

 d'une fasciole peripetale dans cette espece." This fasciole does not occur in the 

 specimens from Kachh, and it is absolutely invisible in the type described above. 



To the above diagnosis may be added : — The inner pores of the anterior poriferous 

 zone of the antero-lateral ambulacra abort ; the madreporic body extends far back and 

 Separates the posterior ocular pores ; the subanal fasciole is distinct ; the plastron is 

 large and wide ; the great tubercles are crenulated slightly. 



There is some variation in the shape with age, and the younger forms are less 

 notched (Plate VII, fig. 8). 



Localities. The species is found in the Nummulitic zone, and also in the higher 

 horizon with Orhitoides. From three or four miles north-east of Pipiir: Survey- 

 number C 039 f. The same, but from a higher bed without Nummulites: Survey- 

 number C 039 A f. From upper part of Nummulitic group with Orhitoides 

 (Oligocene), from near Kapurasir, north of Kayari : Survey-number C 035 f. 



Illustrations of the Species in Plate VII. 

 Fig. 1. The test from above : natural size. 



2. Actinalview: natural size. 



3. Posterior view : natural size. 



4. Apical system : magnified. 



5. Sunken tubercle : magnified. 



6. Pairs of pores : magnified. 



7. A linear longitudinal section : natural size. 



8. A specimen barely notched in front. 



V. Descripion of the Fossil Echimidea from the Beds immediately above the Num- 

 mulitic Series, with Orhitoides in some instances, from Kachh. 



Order ECHINOIDEA EXOCYCLICA. 



Suborder GNATHOSTOMATA. 

 Family CLYPEASTRID^. 



Subfamily EUGLYPEASTBID^. 



Genus CLYPEASTEK, Lamarck, 1801. 

 Specimens of three closely allied species of Clypeaster are in the collection from 

 Kachh. They come from a bed without Nummulites; but their mineral condition 

 resembles that of the upper part of the Nummulitic group, or that which has 

 Orhitoides. 



Unfortunately only part of the specific diagnosis can be satisfactorily determined 

 as the apices are wanting ; but the species are not those mentioned by MM. d' Archiac 

 and Haime and Grant. 



