ESTHERIA CONCENTRIC A. 101 



series, vol. ii, part 2, p. 311 ; Avliere he says, referring to some strata in Skye, "That 

 the strata of this series [with Belemnites abbreviatus, Mill., and Ammonites Murchisonice, 

 Sow., &c.. Middle and Lower Oolite] were originally continuous from the high cliffs 

 between Portree and Holme to the low coast on the opposite side of the island, as stated 

 by Dr. MacCulloch, I can confirm, having found several fossils in blue shale [calcareous], 

 through which a deep canal has recently [1826] been cut by Lord Macdonald, to drain 

 the Lake of Mugsted. Among these shales are the Ammonites Koenigi^ Ostr<2ce in 

 masses, many Belemnites, flattened Tellina (?), &c." 



Estheria Murchisonia is dedicated to Lady Murchison, the accomplished wife of 

 the discoverer of this interesting fossil. It probably belongs to some freshwater or 

 estuarine deposit of the Middle Oolite (Oxfordian). 



11. Estheria concentrica, Bean, sp. PI. Ill, figs. 13 — 17. 



Cypris concentrica, Bean. Mag. Nat. Hist., 1836, vol. ix, p. 376, fig. 54. 

 Inch. Inch. 



Height J-f- 



Length -^-^ V Proportion 1 : Ig-— ,by^ + . 



Thickness ^i J 



^:::: ^-^^-^"^i^- 



Carapace suboviform ; truncate and very shghtly curved at one end (posterior?), Avell 

 rounded, and narrower, at the other ; nearly straight on the dorsal and ventral margins ; 

 umbos large, slightly projecting over the straight hinge-line, nearly at its centre. The 

 dorsal profile of the carapace (fig, 14) is acute-elliptical, somewhat sharper at one end 

 (anterior?) than at the other. The surface is marked with very numerous (60?) closely 

 set ridges or wrinkles and intermediate striae ; the latter are seen, in the interspaces (when 

 these are broad enough), to accompany an obscure reticulation, or linear dotting, parallel 

 with the striae (fig. 15). 



In Loudon's 'Magazine of Natural Histoiy', 1836, vol. ix, p. 376, Mr. William Bean 

 gave a "description and figures of Unio distortus, Bean, and Cypris concentrica, Bean, 

 from the upper sandstone and shale of Scarborough ; and Cypris arcuata} Bean, from 

 the Coal-formation of Newcastle." 



Unio distortus (fig. 53) is first described. The following is the description given of 

 Cypris concentrica (fig. 54) : — " Shell oval, convex, one end a little broader than the other, 

 strongly wrinkled transversely, and covered with minute concentric striae ; the hinge-line 

 is prominent, and this species has more the appearance of a bivalve shell than any of its 

 congeners. Colour, pale brown. Length, nearly 4 fines. Breadth, 6 fines. The 



' This is a Beyrichia, anJ is not uncommon in the Coal-measures. 



