Vol. 50.] RH^TIC AND LIASSIC OSTRACODA OP BRITAIN. 159 



even possible that all the ' White Lias ' here alluded to may 

 belong to the Lower Lias. 



Mr. Moore also mentions as occurring at the Willsb ridge cutting 

 on the Mangotsfield Railway, 1 " 2 b. Laminated light-blue clay, 

 with Estheria minuta [var. Brodieana'?], Gythere liassica, Avicula 

 decussata, etc.", lying on a representative of the well-known Land- 

 scape-stone. He further remarks 2 : — " The surface of the laminated 

 clay (2 b) is often entirely covered by Cythere liassica, the specimens 

 being generally so uniformly arranged lengthwise as to show the 

 direction of the current of the water by which they were last 

 washed." 



1876. — In that part of R. Tate and J. P. Blake's work on the 

 ' Yorkshire Lias ' which treats of the Crustacea, the Rev. J. P. Blake 

 describes and figures a really Liassic Ostracod (p. 430, pi. xvii. 

 fig. 1) as ' Bairdia liassica, Brodie, sp.', which belongs to a 

 different genus (probably Cytheridea). It is not like Brodie's 

 ' Cypris liassica,' referred to above, and of which a labelled 

 specimen is preserved in the Geological Society's Collection. Nor 

 does it agree with M. Terquem's description and figures of Terquem'.s 

 Cypris liassica 3 from the Lower Lias of Zetrich, Halberstadt, 

 Metz, and Jamoigne, which is probably a Cytheridea, and included in 

 Mr. Blake's synonyms (op. cit. p. 130). tn the same list, " 1872, 

 Bairdia [?] ellipsoidea [G. S. Brady, MS. J, Jones, Quart. Journ. Geol. 

 Soc. vol. xxviii. p. 146," with a slightly modified description of 

 the latter, and with some additions, is used for tha Bairdia liassica, 

 loc. cit. 



1877. — H. Woodward, in his ' Catalogue of British Fossil Crus- 

 tacea,' p. 102, refers to " Cythere liassica, Brodie, sp., 1813, Rhaetic ; 

 AVainlode, Severn." 



II. Named Specimens. 



Of authentically named specimens of Brodie's ' Cypris liassica ' 

 I can find only one or two good examples in the Geological Society's 

 Collection ; but none in the British Museum (Natural History), nor 

 in the Museum of Practical Geology. Nor is there a good published 

 figure of that species. 



Other hand-specimens, with Ostracods incorrectly named ' lias- 

 sica,' are also here enumerated. 



I. In the Geological Society's Collection, at Burlington House, 

 are some specimens of cream-coloured limestone full of obscure 

 plant-remains, and bearing a few indications of a small Ostracod. 

 These are labelled: " Naiadites acuminata, Buckm., Geol. Chelt., 

 p. 93; Rhajtic; Bristol; Cypris liassica, Brodie. Rev. P. B. 

 Brodie, P.G.S." 



The above-mentioned specimens exactly correspond in aspect and 



1 Quart. Jonrn. Geol. Soc. toI. xxiii. (1867) p. 498. 2 Ibid. p. 499. 



3 Mem. Soe. Geol. France, ser. 2, vol. v. part ii. (1855) p. 333, pi. xxvi. 

 figs. 12 a, b, c. 



