Notes on Palwozoic Entomostraca. 341 



in dark-grey scliist.^ It is oblong ; the posterior is more evenly 

 rounded than the anterior end. The valve is gently convex towards 

 the middle. An eye-spot and a slight elevation behind it remind us 

 of Leperditia and Isochilina. The outline, eye-spot, and deep 

 ventral margin seem to connect this specimen (small as it is) with 

 the former genus ; but necessarily the determination is not satis- 

 factory with such a minute test-less cast. 



6. Entojiis calcarata (Richter). Plate IX. Figs. 9a, 96, and 10 



(injured behind). 



Length, -^ and -3-0 inch. 



Another of M. Eichter's specimens is a small piece of dark-grey 

 Devonian Limestone from Thuringia, containing (besides fragments 

 of Cardiola ? and Tentacidites) two minute valves, one right and 

 one left ; oblong, boldly rounded at one end (posterior) ; and 

 rounded, notched, and armed with a prow at the other (Fig. 9). 

 There is especially to be noticed in each valve a curved sulcus, 

 starting from the middle of the straight dorsal edge, and bending 

 round towards the an tero- ventral projecting spur or prow. 



These are labelled " C. calcarata," and they bear some re- 

 semblance to the figures of Cypridina calcarata, Eichter, in the 

 Zeitsch. der d. geol. Gesellsch.^- 1869, p. 771, pi. 21, figs. 3-5. A 

 second spur may have projected from the postero-dorsal quarter of 

 the valve (diagonally opposite to the prow), where a mark for its 

 base remains in our Fig. 9a ; and with this there would be a closer 

 resemblance to Eichter's figures. 



Possibly a reference of these sj)ecimens to Entomis, on account 

 of the nuchal furrow, will be correct. We have another spiked or 

 armed Entomis (E. aciculata, Jones, Geol. Mag. Dec. 11. Vol. I. p. 

 511, Fig. 4, woodcut), but the shape and the spur difl:er from those 

 of E. calcarata. 



On a piece of greenish, fine-grained, Devonian schist, from 

 Thuringia, with numerous variously squeezed individuals of Entomis 

 gyrata and serrate- striata, are two small oblong casts of E. calcarata, 

 which approximate to the foregoing, but are not quite so minute, 

 and have both of the lobes and the doi'sal angles more pronounced ; 

 the front lobe, also, bears some obscure sculpturing above the prow. 

 The specimen given in Fig. 10 was at first thought to be of a different 

 kind (with two furrows), but the hinder lobe has been partly over- 

 lapped by a portion of another valve, and the apparently hindermost 

 lobe is adventitious. 



8. Primitia akmata (Richter?). Plate IX. Figs. 11a, lib. 



Length, ^ of an inch. 



M. Eichter also sent for examination in 1874, together with the 



so-called " Cypridinaj" (Entomides) of Thuringia, two small pieces 



of dark clay-schist bearing two internal casts and one external 



1 " a. dorsalis " is from the Upper- Devonian schists of Thuringia. 



2 Richter refers also to the " Leitrag z. Palaont. des Thuringer-Waldes," von 

 R. Richter and F. linger, 1856, p. 37, pi. 2, tigs. 36-38 (Denkschr. uiath.-nat. CI. 

 k. Akad. Wien, vol. xi.). 



