14 DR. J. E. MARR ON THE LOWER [March I913, 



D. Appendix — Notes on the Fossils. 



In the lists given in the paper, a large number of forms are 

 queried, or compared with forms to which they present near 

 affinities. I have no doubt that man)' of these are new,,; but, con- 

 sidering the fragmentary nature of the material at my disposal, 

 I do not feel inclined to create new species. 



The names of the brachiopods are chiefly names which in many 

 cases cover several forms now included in one species. With 

 regard to these brachiopods, it is noteworthy that the large 

 Orthides and StropJiomence occur in great profusion in the Cara- 

 docian rocks, but are rare in Ashgillian strata below the Ashgill 

 Shales, being replaced by much smaller, often minute forms. 



The vague determinations are given in the lists, in the hope of 

 directing the attention of collectors to an area which will un- 

 doubtedly yield a rich harvest. "When this is reaped, the palaeon- 

 tology of the Ashgillian Series of the area can be elucidated in 

 detail. The peculiarly rich and well-preserved fauna of the lime- 

 stones of the Phacops-robertsi Beds will in particular well repay 

 prolonged search. In the meantime, the lists here tabulated will 

 suffice to indicate the dominant forms, and show the marked 

 differences between the Caradocian and the Ashgillian faunas of the 

 Cautley District ; they also enable us to correlate the beds with 

 those of other areas. 



All the fossils referred to in the paper are preserved in the 

 Sedgwick Museum, Cambridge. 



(1) Fossils of the Calymene Beds. 



Echinosph^rites stelltjlifer Salt. — A specimen bearing this 

 name is preserved in the Sedgwick Museum. It was probably col- 

 lected by Sedgwick, and is from ' liavenstonedale.' It is probable 

 that it came from the Calymene, Beds, as the other specimens col- 

 lected by Sedgwick from this tract are from these beds. The Sally 

 Beck basin was included in Kavenstonedale by Sedgwick, and no 

 Ordovician strata occur in Bavenstonedale proper. 



Isolated plates of Cystidea are not uncommon in the Calymene 

 Beds. One from Sally Brow closely resembles the form described 

 by M'Coy l as Aeanthalepis jamesii, which, as Edward Forbes 

 suggests, 2 is almost certainly cystidean. 



Trine cleus. — See p. 15. 



Ivemoplettrides (sensu stricto 1) sp. — Fragments of Remopleurides 

 have been found in the Calymene Beds of Taythes Gill and 

 Backside Beck. 



An external cast showing six of the body-segments and traces of 

 two others comes from Taythes Gill. Axis and pleura alike are 

 ornamented with wavy lines at right angles to the length of the 



i ' Synopsis Silur. Foss. Ireland' 1846, p. 7 & pi. i, figs. 1-2. 

 2 Mem. Geol. Surv. vol. ii (1848) p. 511. 



