446 



ME. E. B. JSTEWTON ON THE 



included under the genus Ghlamys of Boltem, 1798 (type Ostrea 

 varia, Linnaeus), by Sacco and other authorities. 



Locality. Neighbourhood of Urmi. 



Formation. Miocene (? Helvetian). 



Caedium sp. indet. (Plate 29. fig. 5.) 



This is a sandstone-cast of a valve belonging to the genus 

 Cardium, measuring the same both in its height and length, viz. 

 19 millimetres, and in depth 8 mm. Where preserved, the 

 vertical striations on the surface are numerous and very close 

 together; in the ventral area obscure lines of growth can be 

 traced. 



Without more material it is difficult to speak of the nearest 

 ally of a specimen of this description. It slightly resembles a 

 Lower Tertiary form from Asia Minor figured by d'Archiac in 

 Tchihatcheff's ' Asie Mineure,' 1866-69, pi. xi. figs. 6,|7, p. 162, 

 under the name of Cardium indet., which however is longer than 

 high and scarcely so convex as the Persian shell. 



Locality. Eound in the same brown calcareous sandstone 

 accompanying P. rotundatus at Seir, 6 to 8 miles west of Urmi. 



Formation. Miocene (Helvetian or Burdigalian). 



Venus Aglaue^, Brongniart. (Plate 30. figs. 1, 2.) 



CorUs ? Aylaurce, Brongniart, Mem. Sed. sup. Calc.-Trapp. Vicentiny 

 1823, pi. 5. fig. 5, p. 80. 



Venus Aglatirce, Homes, Abhandl. k.-k. Geol. Raichs. 1861, vol. iv. 

 pi. 14. figs. 1-4, p. 122 ; P. Fischer, " Faune Tert. Moyen," in Tchihatcheff's 

 'Asie Mineure,' 1866-69, p. 290; Abich, Geol. Armenischen Hochlandes, 

 1882, pi. 4. fig. 5, p. 278. 



Original diagnosis. — Transversim fere elliptica, ventricosa, 

 cancellata, lamellis transversis crehris ad latera plicato-crispis, 

 serratis. (Brongniart.) 



This well-known species is represented by a single specimen 

 with closed valves somewhat imperfect and worn. The original 

 sculpture of the shell can be fairly seen in places, exhibiting the 

 close characteristic concentric lamellose structure crossed by fine 

 longitudinal striations. The specimen is of typical shape, being 

 transversely elliptical, having a short rounded anterior region 

 and an obliquely curved postero-dorsal margin ; the lunule and 

 escutcheon are a good deal obscured by matrix. 



Z)^^?^e5^s^o?^s (in millimetres). Height = about 60; length = 68; 

 depth =38. 



