50 Prof. T. Rupert Jones — Fossil Estherice. 



results of tlie examination •without consultation with Prof. Weiss, 

 whose death a large circle of friends and admirers had to deplore 

 last summer. 



Of Estheria minnta and some other forms of that genus I gave 

 some notes in the Geol. Mag. Decade II. Yol. V. 1878, pp. 100-102, 

 PI. III. Figs. 1, 2, and now, besides the notices referred to above, 

 I have to make mention of Mr. C. E. De Eance's discovery of this 

 species in the lower part of the " Keuper Marls " of Cheshire, — 

 a lower horizon for England than had been, previously known. 



1. Estheria membranaoea (Pacht). Geol. Mag. September, 1890. 



PI. XII. Fig. 9. 



Jones, Monograph of the Fossil Estherise, Pal. Soc. 1862, pp. 14-22, pi. i. figs. 1-7. 



Length 6 (hinge-line 5), height 4 mm. 



This little fossil has been noticed by P. N. Wenjukoff in his 

 Memoir " On the Fauna of the Devonian System in North-western 

 and Central Eussia," 8vo. St. Petersburgh, 1886, pp. 223-4 (in 

 Puss). In the synonymy he gives Posidonia aspera, Kutorga, 1852, 

 instead of " Posidonomya rugosa, Kutorga," of the list at p. 14 of 

 the " Monograph Foss. Estherise." We may note that Eaimund 

 Pacht in the " Archiv Natur. Liv.-, Ehst- und Kurlands," vol. ii. 

 2nd part, 1859 (" 1861 " in Wenjukoff's list, op. cit. p. 224), treating 

 of the Devonian Limestone in Livland (Livonia), describes and 

 figures E. membranacea, at pp. 290-291, and in figs. 7a, b, c, of the 

 plate (not numbered), as " Posidonia membranacea, n. sp.=:P. rugosa, 

 Kut., auf der Karte des St.-Petersb. Gouv." 



It was remarked at p. 21 of the " Monogr. Foss. Esth." that in 

 the Eussian (or rather Livonian) specimens " the thin upstanding 

 concentric riblets are better preserved than in the flagstones of 

 Caithness." Some individuals, however, from Orkney, collected hj 

 Mr. Jex, and now in the British Museum, show the ornamentation 

 so clearly that Fig. 9 of PL XII. in the Geol. Mag. for September, 

 1890, was specially given, though not described at the time, only 

 alluded to at p. 390. This figure not only shows the longer, or 

 more oblong, shape of the valve, referred to in the " Monograph " at 

 pp. 14 and 15, but a very delicately reticulate interstitial sculpturing, 

 such as was supposed (at pp. 15 and 19) to have been modified by the 

 impress of sand grains iu the matrix at Caithness. 



2. Estheria Andrewsii, sp. nov. PI. II. Figs. 1-4. 



Fig. 1. — Length 8-5 (hinge-line 6), height 6 mm. 

 Fig. 2.— „ 11-5 ( „ 9), ,, 7 mm. 



These specimens, from the Purbeck beds of the Yale of Wardour, 

 as also those described in the Geol. Mag. for September, 1890, p. 

 389, PL XIL Figs. 1, 2, v/ere collected by the Eev. W. E. Andrews, 

 F.G.S., in a quarrj' at Teffont-Ewyas, Wilts, but in a different 

 stratum of the Middle-Purbeck formation, namely, in a dark shaly 

 clay, containing Cypridea fasciculata and C. punctata, five feet below 

 the horizon of the Estheria referred to above. 



The former specimens were referable to E. suhquadrata (Sow.), 



