Notes on Palceozoic Entomostraca. 347 



Fig. 3. — C. Whidbornei, Jones, nov. Left valve; imperfect in the dorsal region, 

 and somewliat crushed at the ventral sulcus. Natural size. 

 a. Lateral ; b. ventral ; c. anterior view. The antero-venti'al edge acci- 

 dentally protrudes in Zb. 

 ,, 4. — Poll/cope JJevoinca, Jones, nov. Left valve. The upper (dorsal) edge 

 should be rather less convex in outline. Magn. 2 diam. 

 a. Lateral ; b. veuti-al ; c. anterior view. 

 ,, 5. — Cyprosina Whidbornei, Jones, hoy. Eight valve. Nat. size. The muscle - 

 spot is present, though obsciu-e, at the top of the ventral sulcus. 

 a. Lateral ; b. dorsal ; c. posterior view. 

 ,, 6. — Uyprosts Saswellii, Jones, nov. Left valve. Nat. size. From the Upper 

 SUurian of the Pentland Hills. 

 a. Lateral ; b. ventral view. 

 ,, 7 — Cypridina F Internal cast of a right valve. Magn. about 4 diam. From a 

 pebble of Palaeozoic quartzite in the Triassic Conglomerate of Budleigh- 

 Salterton, Devon. 

 a. Lateral ; b. dorsal view. 

 ,, 8. — Leperditia ? dorsaiis (Riokiey:) . Inner cast of a right valve. Magn. 25 diam. 

 From the Upper Devonian of Thuringia. 

 a. Lateral ; b. ventral view. 

 ,, 9. — Entomis calcaraia (Richter). Inner cast of a left valve. Magn. 25 diam. 

 From the Devonian Limestone of Thuringia. 

 a. Lateral ; b. ventral view. 

 ,, 10. — E. calcarata (Eichter). Lateral view of an internal cast of a left valve, 

 injured behind and overlapped by part of another valve. Magn. 25 diam. 

 In Devonian schist, with other Entomides, Thuringia. 

 ,, 11. — Frimitia armata (Eichter ?). Inside cast of a left valve. Magn. 25 diam. 

 In Upper Silurian schist, with Tentaculites, from the Thiiringerwald. 

 a. Lateral ; b. dorsal view. 



PLATE X. Figs. 1-6. Upper Silurian Beyrichice from the Thiiringerwald. 



Magnified 4 diameters. 

 Fig. 1. — Beyrichia Kloedeni, M'Coy. Gutta-percha mould of a hollow impression 



(external cast) of a right valve. 

 ,, 2. — B. Kloedmi. Internal cast of a right valve, shortened by having been 



squeezed endwise. 

 ,, 3. — B. Wikkeiisiana, Jones. Inside cast of a right valve. 



a. Lateral ; b. ventral view. 

 ,, 4. — B. affiiiis [?), Jones. Inside cast of a right valve. 

 ,, 5. — B. intermedia (.?), Jones and HolL Inside cast of a right (?) valve. 

 ,, 6. — B. Wilckensiana^. Inside cast of a left valve, obliquely squeezed. 

 ,, 7. — B. Hollii, Jones, nov. Pyritous internal cast of the left valve. Magn. 



23 diam. From the Mentevian flags of St. Davids, South Wales. 

 ,, 8. — B. tuberculata (Kloeden). Internal cast of right valve, imperfect at the 



antero-dorsal corner and at the posterior lobe. Magn. 11 diam. Upper 



Silurian limestone ; Arisaig, Nova-Scotia. 

 ,, 9. — B. tuberculata (Kloeden). Left valve, well preserved. Magn. 11 diam. 



Arisaig. 

 ,, 10. — B. tuberculata (Kloeden). Eight valve; partly imbedded along dorsal 



edge. Magn. 11 diam. Arisaig. 

 ,, 11. — B. Kloedeni, M'Coy, var. antiqitala, Jones. Cast of right valve, with 



a remnant of the prickly margin of the smooth shell. Magn. 11 diam. 



Ludlow beds of the Upper SUurian ; Leintwardiue, Shropshire. 

 ,, 12. — B. Kloedeni. Internal cast of a small left valve. Magn. 23 diam. 



Upper Llandovery beds ; Howler's Heath, Malvern. 

 ,, 13. B. Kloedeni, var. tuberculata (Salter). Large right valve, well preserved. 



Magn. 23 diam. Wenlock Limestone ; Benthall Edge. 

 a. Lateral ; b. ventral view. 

 ,, 14.— J?. Co^M?a/fews/s, Holl MS. nov. Eight valve. Magn. 20 diam. Wool- 

 hope shale ; near Malvern. 



