168 THE GEOLOGICAL AGE OF CENTEAL AND WEST COENWALL. 



The rocks in question are, as is well known, exceedingly 

 rich, in fossils, a careful collation and comparison of which would 

 well rejpay the student. The Museums at Penzance and Truro are 

 especially rich in organic remains from this series — most of 

 them being very carefully marked as to their localities. Many 

 of the fish-spines from Lantivet and Lantick Bays very closely 

 resemble Onchus Murchisonii and 0. tenuistriatus, figured by 

 Murchison from the Upper Ludlow bone-bed (see "Siluria," 5th 

 Ml. PI. XXXV, Fiffs. 1^-17, and PI. xxxiv, Fig. 1 ; see also several 

 good figures of Cornish fish-remains, Onchus, &c., in PI. 1 and 

 2 of Mr. Peach's paper, Trans. E.G. S.C., Vol. VII, p. 17. 



On the whole the fish-remains from Lantivet Bay, Looe, and 

 Polperro, seem to be quite as closely related to the Liidlow as to 

 the Old Ped Sandstone ; although up to the present we believe 

 that but few have been identified as characteristic species. 



The following lists, which are still far from complete, and 

 which refer only to the South Cornwall beds from St. Austell 

 Bay eastward to Looe, may be substituted for that given on pp. 

 26 and 27 of the former paper. 



ACTINOZOA. 



1. Cyathophyllum celticum (^Milne- Edwards) — lurhinolopsis celtica 

 {PhiUij}s).^=Petraia celtica '^Lonsdale and Me Coy)] v. 

 Phillips, Pal. Foss., pi. I, fig. 1. — Fowey, Looe, Polruan, 

 Peadymoney, Gribben, Crinnis, Blackhead, Gorran (?) 

 Bodmin, Wadebridge, St. Columb, S. Petherwyn, 

 Tintagel and many other localities, according to P. G. 

 Couch, C. W. Peach, and others. This appears to be 

 a species of very wide range, although its characters are 

 so far not completely made out. Salter gives it as Upper 

 Devonian ; Murchison {Sil. 5th, Ed., p. 276) says it is also 

 Middle Devonian on the authority of Lonsdale, who 

 records it from the Ilfracombe group. If it really occurs 

 both at Gorran and S. Petherwyn as stated by Couch, 

 it must range from the Llandeilo or Caradoc up to the 

 Upper Devonian, and consequently it can be of no value 

 for settling the disputed question of the age of the 

 Powey beds. Peach says it occurs with the graptolite 

 Protovirgidaria dicJiotoma at the Blackhead, which is a 

 Silurian and even Loiver Silurian form. (See Trans. 

 E.G.S.C, X., 93). 



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