442 ME. E. B. NEWTON ON THE 



costse separated by grooves of rather less width. Sacco has 

 recorded this species from the Helvetian Beds of Piedmont (Boll. 

 Soc. Geol. Italiana, 1889, vol. viii. p. 331). 



The species has been previously known from Bordeaux 

 (Basterot) ; Portugal (J. de C. Sowerby); Constantine (Coquand) ; 

 Sardinia (Meneghini) ; Piedmont (Sacco) ; Persia (Fuchs) ; Egypt 

 (Newton). 



Locality. In a matrix of compact, cream-coloured foraminiferal 

 limestone ; from the neighbourhood of Urmi. 



Formation. Miocene (Helvetian). 



Pecten convexo-costatus, AbicJi. 



Pecten convexo-costatus, Abich, M^m. Ac. Imp. Sci. St. Petersbom-g, 

 1858, vol vii. pi. 1. figs. Ab, 4c, p. 188 ; Geol. Armenischen Hoclilandes, 



1882, pi. 1. figs. 6, 6 a, pi. 8. fig. 2, p. 276 ; Fuchs, Palseontographica, 



1883, vol. XXX. pi. 21 (xv.). figs. 1, 2, p. 40 (58). 



Two lower valves of this species are attached to a piece of 

 yellowish-white limestone. They are much weathered so that the 

 fine concentric strise are almost obsolete, but the characteristic 

 convex and narrow costse numbering from 20-22 are prominently 

 shown. This is a fairly distinct species, and not to be confused 

 with Eichwald's P. aduncus of 1830, from Poland, which has 

 wider, fewer, and naore depressed ribs, and which Homes regarded 

 as[synonymous with P. convexo-costatus, uniting both under the 

 older name. 



Abich's original specimens were obtained from the neighbour- 

 hood of Urmi ; the species is also recorded from Egypt by 

 Fuchs. 



Locality. Gruverchin Kala, north end of Lake TJrmi. 



Formation. Miocene (Helvetian). 



Pecten stjbuemiensis, Abich. 



Pecten subttrmiensis, Abich, Geol. Armenischen Hoehlandes, 1882, pi. 8. 

 figs. l-8«, p. 276. 



This species is represented by a number of lower valves, which 

 although rather fragmentary show the characteristic wide, 

 curved, and depressed costse crossed by obscurely fine striations ; 

 the umbonal region is rounded and incurved. The original 

 specimens were described by Abich as from the Urmi Plateau. 



Localities. Two examples are in a drab-coloured limestone, 

 and were found at Guverchiu Kala, northern end of Lake Urmi ; 

 two others are in a greyer rock localised as from the same place ; 



