246 THE FOSSIL ECHINOIDEA OF WESTEEN SIND. 



The Khirthar fauna, when viewed with respect to its homotaxial relations, is not 

 less remarkable. The Nummulitic horizon of Egypt and Lybia, with which comparison 

 may most suitably be instituted, presents an Echinifauna of 61 species, described by 

 de Loriol; and of these none are common to the two areas. The generic constitution 

 of the faunae, however, shows an unmistakable homotaxial relationship, as out of 

 22 genera represented in the Egypto-Lybian area (compared with 25 genera in the 

 Khirthar series of Sind), 16 genera are found to be in common. 



A similar generic affinity will be found to exist when the Khirthar Echini are 

 compared with those of the different European Nummulitic areas; but in no instance 

 can a case of specific identity be established. 



The forms which may be considered as representatives of species occurring in the 

 various Nummulitic areas of Europe have been indicated in the preceding pages. 



V. Note on doubtful Khirthar Species. 

 We again draw attention, for the sake of caution, to the three forms included in 

 the present collection, but which we do not consider to belong to the Khirthar horizon. 



These are : — 



Temnechinus Bousseaui, d'Archiac, sp. 



Moira primceva, Duncan & Sladen. 



Breynia carinata, d'Archiac & Haime. 



In each case the species is represented only by a single, badly preserved, fragmen- 

 tary example, and the matrix is altogether different from that of the other Echinoids 

 from the Khirthar series of strata. There seems little doubt that these specimens have 

 been included in this collection by mistake, and were probably marked by accident as 

 coming from the localities to which they are respectively assigned. 



