26 FOSSIL ESTHERI^. 



EsTHERiA STRIATA, Var. Tateana. PI. I, figs. 15 — 18. 



Inch. Inch 



Height il 



Length fl 



Height of valve, | 



ih Proportion 2 to 3, or 1 : H 

 Length i*^ '2 



Proportion 5 to 7, or 1 : li — , 



Height, nearly. ^, i-^^) Proportion 11 to 14. or 1 ;1 +. 

 Length, more than -fjj „ j 



Carapace-valves nearly oblong, but higher at the posterior third than anteriorly, boldly 

 rounded behind with a semicircular outline, obliquely rounded in front. Eig. 18 repre- 

 sents a shorter carapace than fig. 1 5 ; and some appear to have 

 ^^^- ^' been even shorter, and of a more rounded form, than this. We 



Sketch of a subquadrate jjr^yg g^ corresponding occurrence of oblong or subovate, in company 



0/ s ena ^^^-^ subquadrate, forms of Estherian carapace in the case of 

 striata, /ro»« Lammer- . -rrn^ t • i> -r ^^ -m -rr r> 



ton, Berwickshire. *^^ Rhsetic U. Manmhensis of India (PI. II, figs. 16 and 20), 



and the Wealden U. elliptica (PL IV, figs. 1 and 8). The out- 

 lines of the specimens figured may have been slightly altered 

 by pressure, but they are far more perfect than the majority of 

 those I have seen from Lammerton. 



The specimens of Estheria striata, var. Tateana, were kindly 

 (Magnified 6 diameters.) Submitted to me by their discoverer, Mr. George Tate, E.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 associated with Eish-remains, Spirorbis carbonarius^ and 

 impressions of Plant-stems. The shale belongs to the Mountain-limestone series, and 

 comes from Lammerton, in Berwickshire. 



To render the geological position of these Estheria 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 Estheria is exposed in the cliff along the 

 Berwickshire coast for upwards of a mile ; it is accessible, however, only at a few points ; 

 and EstJieria 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) : — 



Feet. Inches. 



1. Reddish sandstone 90 



2. Dark carbonaceous shale, with ^sMen'^E y where thickest, it is generally hard and 



flaggy 12 



3. Limestone, fossiliferous ; usually of a dun colour, and weathering buff A 



