Description of Entomostraea, &c. 85 



EsTHERTA STRIATA, Var. Tateana, Joues. 



Monogr. Foss. Estheriee, Pal. Soc. 1862, p. 26, pi. I., figs. 15—18. 



Height of valve, l-6tliof an inch, length 3-12ths of an inch. Proportion 

 2 to 3, 



Height 3-24ths of an inch ; length 5-24ths of an inch. Proportion 5 to 7. 



Height, nearly I -10th of an inch ; length, more than 1-lOth of an inch. Pro- 

 portion 11 to 14, 



"Carapace-valves nearly oblong, but higher at the posterior 

 third than anteriorly, boldly rounded behind with a semicir- 

 cular outUne, obliquely rounded in front. Some have a shorter 

 carapace, and appear to have been even 

 shorter, and of a more rounded form, ^^«- !•* 



than others. We have a correspond- ^'^^^ti^i li^^T.^Tf^.^^, 



ing occurrence of oblong or Subovate, fromLammerton.Berwickslnre- 



in company with subquadrate forms 

 of Estherian carapace in the case of 

 the Rhsetic E. Mangaliensis of India, 

 and the Wealden E. elUptica. 



*'The specimens oiEstheria striata, 

 var, Tateana, were kindly submitted 

 to me by their discoverer, Mr George (Magnified 6 diameters.) 

 Tate, r.G.S., of Alnwick, some years 



since. They are numerous, but obscure, occurring either as 

 impressions or as thin rusty films, or as a faint reticulate 

 tissue, in a black and somewhat bituminous shale. They 

 seem to have been originally densely crowded ; and are asso- 

 ciated with Fish-remains, Spirorhis carlonarius, and impres- 

 sions of Plant-stems. The shale belongs to the Mountain- 

 limestone series, and comes from Lammerton, in Berwick- 

 shire. 



" To render the geological position of these Esther ice quite 

 plain, Mr Tate has obliged me with a succinct account of the 

 strata and fossils observed by him in the section where these 

 shales are met with. He says — 



" ' The dark carbonaceous shale containing Estherice is 

 exposed in the cliff along the Berwickshire coast for upwards 

 of a mile ; it is accessible, however, only at a few points ; and 

 Estheria has apparently but a limited distribution in the bed. 

 I have found it only near Lammerton. The section here, is 

 as follows (in descending order) : — 



* For the use of this wood-cut, the club is indebted to the Palaeontographi- 

 cal Society. In Professor Jones's monograph on Fossil Estherise, -will be found 

 full illustrations and descriptions of all the varieties of Estheria striata. 



M 



