E. H. Davison- — Castle-an-Dinas Wolfram Mine. 347 



under this name seem to belong to Kayser's species Lethcece} 

 The form from North Devon which Whidborne '^ described as 

 Dalmanites {Cryjjhceus) laciniatus var. occidentalis is quite distinct 

 from our Torquay specimens. The use of the subgeneric name 

 Asteropyge in place of Cnjphams is here adopted.^ 



Dimensions. — Pygidium (S. 1): length, (I) c. 17 mm., (II) c. 9 mm.; 

 width (I) c. 20 mm., (II) c. 11mm. Head-shield (S. 2): length, 

 8 mm. ; width, c. 18 mm. 



Horizon. — Red Beds (Staddon Grits). 



Locality. — New Cut, Torquay (8. 1, 2). 



Beyrichia {Zygobeyrickia) devonica (Jones & Woodward). 



1889. Beyrichia devonica Jones & Woodward, Geoi.. Mag., p. 386, PI. IX, 



Figs. 3a-3d(? 4, !^). 

 1916. Zygobeyrickia devonica Ulrich, Prof. Paper 89, U.S. Geol. Surv., p. 291, 

 pi. xxvii, figs. 1-6. 



The species Beyrichia devonica, which was first described by Jones 

 and Woodward from the New Cut, Torquay, has been recently 

 recorded from the Chapman Sandstone (Lower Devonian) of Maine 

 by Ulrich (op. cit.), who selects it as the type of a new genus, which 

 he calls Zygobeyrickia, characterized '' by the jiartial or complete 

 obsolescence of the posterior lobe and by the excessive development 

 of the ventral junction of the median and anterior lobes ". It 

 may be questioned whether this should not denote subgeneric rather 

 than generic rank. The type-specimens of the species are in the 

 Sedgwick Museum. 



Horizon. — Eed Beds (Staddon Grits). 



Loccdity. — New Cut, Torquay. (S. 89.) 



EXPLANATION OF PLATE IV. 



Fig. 1. — Homalonotus (Biirmeisterella) bifurcatus sp. nov. Head-shield, x 1|- 



Staddon Grits : New Cut, Lincombe Driye, Torquay. (Sedgwick Museum.) 

 Fig. 2. — Ditto Pj^gidium of same specimen, x l^-. (Sedgwick Museum.) 

 Fig. 3. — Ditto. Impression of same pygidium, showing terminal spines. 



X 1-2". (Sedgwick Museum.) 

 Fig. 4. — Homalonotus (Parahomalonotiis) Whidbornei sp. nov. Nat. size. 



Meadfoot Beds : field at back of Kilmorio, near Plope's Nose, Torquay. 



(Torquay Museum.) 



On the Geology of Gastle-an-Dinas Wolfram Mine. 



By E. H. Davison, B.Sc. 



npHERE are two hills named Castle-an-Dinas in West Cornwall, 

 -■- one near Penzance and the one on which the Wolfram Mine is 

 situated, which lies about 2 miles east of St. Columb Major and 

 about 4 miles to the north of the St. Austell granite mass. 



^ Kayser, op. cit., p. 86, t. xi, figs. 5, 6. 



2 Whidborne, Quart. Journ. Geol. Soc, vol. Iviii, 1897, p. 445, pL xxxiii, 

 figs. 9-13. 



3 Reed, Geoi.. Mag., 1905, pp. 173, 225. 



