PHACOPS. CHEIRURUS. 7 



that specimens of Ph. batrachens have been mistaken for it. In the Torquay- 

 Museum is a specimen (Plate I, fig. 9) which exactly agrees with the German 

 fossils, but it is without a locality, and, though it looks as if it might have come from 

 Newton, the nature of the matrix is not such as to fix it definitely. Mr. Yicary 

 informs me that he has seven specimens, all tails, from Wolborough, one of which 

 is figured on page 20 of Salter's Monograph. Possibly, however, some of these 

 may belong to Ph. batracheus, as also in all probability does the one given by the 

 same author as a variety of Ph. latifrons (loc. cit, Plate I, fig. 16). On the other 

 hand, I can see no likeness to Ph. cryptophthalmus in the fossil Salter describes from 

 Newton under that name. The authorities of the Museum of Practical Geology 

 have, at my suggestion, cleared it from the matrix as far as possible, and I can 

 therefore give a slightly better figure of it than before (Plate I, figs. 8, 8 a). The 

 result is that I am confirmed in my opinion that Ph. cryptophthalmus must be 

 removed from the English lists, and the specimen be regarded as in all probability 

 belonging to Ph. latifrons. From Barton the only specimen I know is one in the 

 Lee Collection in the British Museum, which is of rather small size and preserves 

 the test. Phacops latifrons, however, occurs plentifully in the shales above the 

 limestones at Hope's Nose, where its eye forms one of the most conspicuous fossils ; 

 and it is also found in great profusion in the Upper Devonians at Baggy Point in 

 North Devon. From this locality a magnificent series of specimens of all sizes 

 were collected by Prof. Hughes and his Cambridge party in .1887, and are now in 

 the Woodwardian Museum. 



Phacops latifrons is very common in the Eifel ; but, although distinguished by 

 Bronn in 1825, it has often been confused by later authors with another common 

 species, Ph. Schlotheimi (Bronn), which has a much more elongated form, a larger 

 eye, and a differently shaped glabella. I have examined large numbers of the two 

 species in the British Museum, and feel quite convinced that Dr. Kayser and others 

 are right in restoring Bronn's species, and that therefore the references to the 

 latter must be removed from its synonymy. I would also follow Dr. Kayser in 

 believing that the P. latifrons and P. Bronni of F. A. Romer are really synonyms 

 of P.fecundus of Barrande, and that they too must, therefore, be removed from 

 the list. 



II. Family. — CHEiRURiDiE, Salter, 1864. 



1. Genus. — Cheirurus, Bcyrich, 1845. 



With its prominent and peculiar glabella, its indented cheeks, its small faceted 

 eye, and its facial suture severing a large and almost right-angled free cheek, this 

 2 



