104 THE FOSSIL ECHINOIDEA 



have evidently, from the nature of their matrix, been assigned by accident to the 

 Khirthar formation ; they are also characteristic fossils in Jiigher beds. None of the 

 Khirthar forms have as yet been found in the Nari series. 



The relations of the Khirthar Echinoidea with those from other homotaxial areas 

 are representative but not identical : the general facies of the fauna and its peculiarities 

 will be remarked on in the sequel. 



Owing to the nature of the matrix and the accidents and difficulties of exposure, 

 the Khirthar fossils are not preserved in such beauty and perfection as is frequently 

 the case in Tertiary specimens from higher beds. Many are more or less broken or 

 obscured by matrix, and in some instances out of a dozen examples none are absolutely 

 perfect. These circumstances have obviously increased the difficulties of determination. 

 Out of the 70 species and varieties mentioned in this Fasciculus, there are 10 forms to 

 which we have refrained from assigning, on the above grounds, any specific name. In 

 most cases they are isolated specimens, and all that can be said definitely about them 

 is, that they diff'er from the other forms recorded. Their state of preservation is such 

 as to render a useful description impossible ; and we have consequently considered that 

 the interests of science are best served by simply placing their occurrence on record 

 until better material is available. Wherever practicable, a drawing of the specimen 

 has been given, for the assistance of the labours of the Geological Survey. 



II. List of the Fossil Hchinoidea from the Khirthar Series. 



Order ECHINOIDEA ENDOCTCLICA. 



Family CIDARIDJE. 



Genus Cidaeis, Klein, 1734. 



Subgenus LEiocroAEis, Desor, 1854. 

 Leiocidaris canaliculata, Duncan Sf Sladen : p. 109. 



Genus Pobocidaeis, Desor, 1854. 

 Porocidaris anomala, Duncan Sf Sladen : p. 113. 



Family GLYPHOSTOMATA. 



Subfamily DiABEMATiDiB. 



Genus Oiphosoma, Agassiz, 1840. 



Cyphosoma macrostoma, Duncan Sf Sladen : p. 116. 

 undatum, Duncan ^ Sladen : p. 117. 



Genus Miceopsis, Cotteau, 1856. 

 Micropsia Tenustula, Duncan Sf Sladen; p. 119. 



Subfamily TEMNOPiErEiBiB. 



Genu^ Temnechintjs, Forbes, 1852. 



* Temneehinus Eousseaui, d'Archiac, sp. : p. 122. 



* A single example, evidently included accidentally in the Khirthar Collection. It came from a much 

 higher horizon. 



