146 Hoicard Fox — Devonian Rocks and Fossils 



Cornwall, vol. xi, 1894, pp. 634-644. The followino^, amongst 

 others, were noted : fragmentary plates of Pteraspis ; Oithoceras ; 

 Bactrites, inclading B. Budesheimensis, Ferd. Roemer; Goniatiles ; 

 G. (Tornoceras) siinpIex,Yon Buch; Euomphalus; Cardiola relrostriata, 

 Von Bucli ; Centronella, Phacops, Tentacidites, Styliola, Amplexns, 

 Favosites, and Pachypora. According to Mr. G. C. Crick the 

 majority of the Cephalopod remains indicate the same geological 

 horizon as the Budesheim Beds, that is, the lower portion of the 

 Upper Devonian, but with these there are some small forms resembling 

 Anarcestes latiseptatus, Beyr., and Mimocerns compressus, belonging 

 to the Wissenbach (Nassau) Beds, of Lower and Middle Devonian 

 age. On visiting the localit^^ again, after an interval of six years, 

 I was disappointed at not finding any new forms exposed by the 

 ceaseless scour of the waves and sand on the rocks. 



West of Newtrain Bay.^ — The shales here contained some frag- 

 mentary crinoidal arms, which were determined by Mr. F. A. 

 Bather to be of a nearly similar character to those of Scaphtocrinus, 

 Hall, as figured by the Eev. G. F. Whidborne from the Pilton Beds 

 near Barnstaple (see " Dev. Fauna S. of England" : Pal. Soc, 1898, 

 vol. iii, pt. 3, pp. 228-232, pis. xxxi, xxxiii-xxxviii). 



Mother Ivey's Bay. — A shelf of bine shale is exposed at the east 

 end of the beach at this place, near high-water mark, which contains 

 fragmental crinoidal stems, pyritized examples of Tentacidites, and 

 Centronella similar to those occurring at Trevone, and, in addition, 

 a specimen of Hijolitlies. 



Porthcothan Cove. — This picturesque cove is about three miles 

 south of Trevose Head. The rocks are of a bluish, non-calcareous 

 shale, showing a general dip E.N.E. at 15-20°. Fossils do not 

 appear to have been previously noticed in them, but they contain 

 a fair number, though for the most part in poor preservation. The 

 following have been recognized : — Petraia, in casts showing the 

 outlines of the cup and septa, are not uncommon. Two species 

 appear to be represented ; one may be P. celtica. Plenrodictyinn, sp., 

 described below, fragments of Conularia similar to those from 

 Constantino Bay (Trans. Roy. Geol. Soc. Cornwall, 1894, p. 643), 

 imperfect pygidia of Trilobites,- and obscurely shown examples of 

 Orthoceras and Goniatites. 



Forth Mear. — This cove is about half a mile south-west of 

 Porthcothan, and the rocks enclosing it are of the same character. 

 On the foreshore several distinct fossiliferous bands are exposed ; 

 one of these can be traced for a distance of 40 yards nearly due 

 east from the north end of the island ; numerous specimens of 

 Pleurodictynm are weathered out of its surface. 



Power Putter Cove. — The same kinds of rocks and fossils noted 

 from Porthcothan and Porth Mear are likewise found in this cove, 

 which is about half a mile south-west of the last-named place. The 

 fossiliferous beds are visible at low-water, at the base of the eastern 



1 At the Bay itself I have since found two species of Favosito corals. 

 ^ A Trilobite minus the head, which I have recently obtained here, has been 

 determined by Dr. H. "Woodward to be a species of Fhacops. 



