Br. E. Woodivard — On the Genus Oyclus. 



537 



Henry Johnson's collection from Coseley, near Dudley, I am inclined 

 to refer them both to the same species. 



Fig. 3. — Gyclus Scotti, H. "Woodw., Lower Coal-measures, Bacup, Lancashire. 



A. Dorsal aspect of carapace (nat. size). 



B. A portion of the left posterior border, magnified to show ornamentation. 

 [See Geol. Mag. 1893, Dec. III. Vol. X. p. 28, for full description.] 



Length of Bacup specimen 20 millimetres long and 25 mm. broad. 

 „ of Coseley ,, 10 millimetres ,, and 13 mm. ,, 



The most striking feature about this specimen is the very strongly 

 accentuated raised circular lines which give quite a character to this 

 form, and also the very steep acclivity to the outer margin of the 

 shield, save at the anterior border, which is marked by indistinctly 

 preserved oval prominences. 



As this species was so recently described (1893) in this 

 Magazine, it may be sufficient to point out that in our Plate 

 XV. Fig. 3 the anterior border does not show the two inner oval 

 prominences noticeable in C. Scotti (see Woodcut above), and which 

 are very distinctly marked in Cyclus {Halicyne) agnotus, H. von 

 Meyer, sp., from the Muschelkalk of Eottweil, Germany (see Geol. 

 Mag. 1870, Vol. VII. PI. XXIII. Fig. 8), a form that, in some 

 respects, comes near to our Coseley Cyclus. The ornamentation on 

 the surface of the carapace has a similar finely granulated appearance 

 in both specimens, and the encircling ridges in both are very 

 strongly marked. 



Formation. — Pennystone Ironstone of the Coal-measures. 



Localities.— Coseley, near Dudley, Staffordshire, and Bacup, Lan- 

 cashire. 



4. Cyclus Johnsoni, H. Woodw., sp. nov. PI. XV. Figs. 4, 5, 6, 7. 



I have ventured to place the four examples (Figs. 4-7) and some 

 others not figured, all from the " Pennystone " ironstone of the 

 Coal-measures, Coseley, near Dudley, in one species. Fig. 4 exposes 

 the outer dorsal surface ; Figs. 5, 6, 7 (which, like the preceding 

 Fig. 4, are all drawn twice the natural size) show the dorsal shield 

 more or less removed, especially over the central part, revealing 

 the fact of the similarity of all three species on the underside to 

 C. Eankini (PI. XV. Fig. 8). The following are the measurements 

 of the four figured examples : — 



Fio-. 4. Length, 14 mm Breadth, 16 mm. 



Fig. 5. „ 14 ,, „ 18 ,, 



Fig. 6. „ 12 ,, „ 16 „ 



Fig. 7. „ 13 „ „ lo ., 



