166 ON PERMIAN ENTOMOSTRACA FROM 



appe:ndix. 



To complete our account of Permian Entomostraca, figs. 17 — 

 25 are added, as illustrative of species either new or requiring 

 further illustration. 



1. Cytr'e-re (Bairdia) FJ^EBEi A, Eeiiss. Var. caudata, Kirkby. 



PL XL, figs. 17, 18a— 18c. 

 In this variety (see Mr. Kirkby's description, p. 141) the 

 posterior extremity (the lowest end in the figures) is drawn out 

 into a sharp, upturned point. It is strikingly contrasted with 

 the short-angled hinder extremity in varieties illustrated by figs. 

 9 and 10, and also with the tapering, but obtuse angle of this 

 extremity in fig. 8. The anterior hatchet-shaped or cheese-knife- 

 like border is broadly developed also in figs. 17 and 18a, even 

 more so than in any of the figures in plate IX. These two 

 specimens are selected from a series forwarded to me by Mr. 

 Kirkby, and collected by him at Tunstall Hill, near Sunderland. 



2. C. (Bairdia) ampla, Reuss. PI. XL, figs. 19(2 — 19/ 



The specimen here figured is far more perfect than that shown 

 in fig. 14. This broad, thick, and symmetrical carapace, with its 

 obtuse and almost equal extremities, reminds us, like the other 

 Bairdia, of the Scythian bow in its outline. This specimen was 

 collected by Mr. Kirkby from the magnesian limestone of Ham- 

 pole, in Yorkshire. It exhibits traces of surface-ornament in 

 the form of minute punctation (fig. 17/). 



3. C. Tyronica, spec. nov. PI. XL, figs. 20a.— 206. 



Cythere? inornata, M'Coy. King and Jones, " Journ. 

 Geol. Soc, Dublin," vol. vii., p. 69, note and p. 

 78; pi. 1, fig. 13. 

 I have seen only two single valves of this Entomostracan. They 



