190 PERMIAN FOSSILS. 
obscurus. From an examination of the original specimen belonging to Mr. Binney, of 
the unnamed fossil represented in the ‘Transactions of the Manchester Geological 
Society,’ vol. i, pl. 6, fig. 18, I have little doubt of its belonging to this species. ,I 
cannot speak so confidently of the specimens represented by figs. 30 and 31, under 
the names of Avinus parvus and Axinus undatus, though I have a strong suspicion of 
their being the same. By tracing the lines of growth on Mr. Binney’s specimen of 
the so-called Awinus wndatus, 1 cannot perceive any flexure corresponding to the one 
in the ventral margin; on the contrary, the fossil appears to be broken where the 
flexure occurs. 
Schizodus obscurus occurs very abundantly at Garforth Cliff Quarry near Leeds; 
Woodhall, Yorkshire; Stubbs Hill near Doncaster; and Nosterfield. Mr. Binney has 
collected it at Kirkby Woodhouse, Notts; Bolsover ; near Elmsall, Yorkshire ; Bedford, 
Atherton, Monton, Patricroft, and Newtown in Lancashire. It probably occurs at — 
Ferrybridge; as Professor Phillips found a fossil there, which is supposed to be the 
present species. (Phil. Mag., New Series, vol. iv, p. 401, 1828.) 
SCHIZODUS ROTUNDATUS, Brown. Plate XV, fig. 30. 
AXINUS RoTUNDATUS, Brown. Trans. Manch. Geol. Soc., vol.i. p. 31, pl. vi, fig. 29, 1841. 
(?) — _ pucILuus (young), Brown. Op. cit., vol. i, p. 31, pl. vi, fig. 32. 
(?) Lucina MINIMA 6 Op. cit., vol. i, p. 32, pl. vi, fig. 33. 
LAsT THREE SYNONYMS 5 Brown, Fossil Conchology, pl. Ixxix, figs. 1, 2, 3, 
10, 11, 12, 1843. 
Idem. a Morris, Catalogue, p. 80, 1843. 
Idem. - De Verneuil, Bull. Soc. Géol. de France, 2™ série, 
vol. i, pp. 31, 32, 1844. 
Idem. 3 Geol. Russ., vol. 1, p. 224, 1845. 
Idem. as Tennant, Strat. List, p. 88, 1847. 
(2?) Scuizopus ScHLOTHEIMI, Geinitz. Versteinerungen, pl. ili, fig. 33, 1848. 
Diagnosis.—“ Shell nearly orbicular; umbones almost central, acute, and remote; 
surface smooth. Length upwards of three eighths of an inch; breadth nearly half an 
inch.” ’ (Brown.) 
This appears to me to be the only real species which Captain Brown has described ; 
but it is much to be regretted that the original specimen is so badly preserved, that I 
am not able to speak with sufficient confidence on this point. By tracing the lines of 
growth, its posterior half is apparently shorter, and more rounded than in Schizodus 
obscurus, or any other congeneric species, with, perhaps, the exception of Schizodus 
Rossicus, which appears to resemble it very closely. Captain Brown is undoubtedly 
wrong in describing it as being smooth; as Mr. Binney’s specimen is distinctly threaded 
parallel to the margin. It seems to have had rather thick valves. 
Schizodus rotundatus was found by Mr. Binney in the Permian Marls at Newtown, 
near Manchester. 
1 Transactions of the Geological Society of Manchester, vol. 1, p. 31. 
