Echinoidea from Western Persia. 503 



The second fauna was collected by Mr. J. V. Harrison in the 

 same district, at the locality of Tang Diarah, near Gilan, The 

 fossils include some echinoids, most of which have been rather 

 distorted. 



The collection includes the following species : — 



1. Schizaster vicinalis Agassiz & Desor, 1847 ; Gauthier, 1902 

 (op. cit., p. 172, pi. xxiii, fig. 4). Obtained by de Morgan from the 

 Upper Eocene at MoUah Ghiavan. Mr. Harrison's specimen is 

 from the Upper Eocene at Tang Diarah. It is somewhat distorted. 



Dimensions. — Length 48 mm., breadth 44 mm., height 25 mm. 



2. Schizaster rimosus Desor, 1847 ; Gauthier, 1902 (ibid., 

 p. 174, pi. xxiii, fig. 5). De Morgan's specimens are from the Upper 

 Eocene at Mollah Ghiavan. 



Mr. Harrison's specimen from Tang Diarah is poorly preserved. 

 This species resembles S. vicinalis in many ways. It is distinguished 

 therefrom by its unpaired and paired anterior ambulacral grooves 

 being narrower, and by the posterior petals being relatively a little 

 longer. 



3. Ditremaster nux (Desor), 1853 ; Gauthier, 1902 (op. cit., p. 164, 

 pi. xxi, figs. 9-11). De Morgan collected many specimens from the 

 Upper Eocene at Mollah Ghiavan. Mr. Harrison's specimens from 

 Tang Diarah have the following dimensions : — 



Length. Breadth. Height. 



Hg . . . 24 mm. 22 mm. 19 mm. 



H4 . . . 27 mm. 23 mm. 21 mm. 



Ht . . . 15 mm. 13 mm. 11mm. 



These dimensions do not agree with those of de Morgan's specimens 

 which are as broad as they are long ; but Mr. Harrison's specimens 

 are somewhat crushed. They may belong to the oval variety of 

 D. nux mentioned in Pal. franc., Terr, tert., vol. i, p. 422. 



4. Euspatangiis gkiavanensis Gauthier, 1902 (op. cit., p. 150, 

 pi. xxi, figs. 1 and 2). This species was originally obtained by 

 de Morgan from the Upper Eocene at Mollah Ghiavan. 

 Mr. Harrison's specimens are from Tang Diarah. Dimensions : — 



Length. Breadth. Height. 



H12 ... 30 mm. 26 mm. 13 mm. 



Hi3 . . . 22 mm. 20 mm. 10 mm. 



Hy . . . 24 mm. 21mm. 10 mm. 



The age of this fauna is unquestionably Upper Eocene. Some 

 Middle Eocene echinoids are known from the Pusht-i-Kuh area, but 

 none of those Middle Eocene species is present in Mr. Harrison's 

 collection, 



