1865.] SALTER LINGULA-FLAG FOSSILS. 477 



St. David's. I think hardly any of the forms are distinct. There 

 are Ano2^olenus,Conocoryp7ie,Microd{sms,IIolocephalina,toget'heTwith 

 Tlieca and Agnostus, all, or nearly all, of the same species as those de- 

 scribed in our paper. There is also a new genus of Trilobites, which 

 we have called Erinnys, distinguished by the great number of the 

 body-rings ; and this is also found in both North and South Wales. 

 This identity of forms between localities so widely separated and on 

 the same horizon, gives us great reason to beheve that the fauna is a 

 marked and persistent one over larger areas. And we have large 

 seen that it is distinct specifically both from the fauna of the Middle 

 and from that of the Upper Lingula-flags. Curiously enough, however, 

 the great Paradoxides, which is the conspicuous fossil in South Wales, 

 has not yet been found in the North Welsh locality. But at an interme- 

 diate spot (the famous gold-mines of Dolgelly) fragments of this large 

 fossil were found about the same time by Mr. Eeadwin, and by his 

 assistant-chemist, Mr. Ez. Williamson, the superintendent of the 

 lead- and silver-mine at Tyddyn-gwladys. I examined this ground 

 critically last autumn, and found thatthe position of the " Paradoxides- 

 beds " {Tlieca also accompanied the Trilobites) was the same as in 

 South Wales, namely, a short distance above the Lower Cambrian 

 Sandstones, in bands of uncleaved black slates mixed with trappean 

 ashes. The facts above cited show that we are justified in recogniz- 

 ing the Lower Lingula-flags as a separate formation, quite as distinct 

 from the upper portion as the latter is from the Tremadoc Slates which 

 overlie it. All the species in the three separate groups, with very few 

 and, indeed, trifling exceptions, are peculiar ; and there are many 

 distinct genera in each *. 



iVbfe on the Genus Anopolenus. By Henry Hices, Esq., M.E..C.S. 



New specimens having been found during my search at St. David's, 

 I have been enabled to reconstruct the form of this very curious 

 fossil, of which two species are known. My friend Mr. Salter did 

 me the favour to name the first one after myself, when defining the 

 genus so far as then known. The second and larger species is 

 more common than the first, and he allows me to nam.e it after him, in 

 memory of pleasant days spent together on the cliffs of St. David's. 

 Gen. Char. — Elongated and depressed. Head occupying a fourth 

 of the whole length, semicircular, with prolonged spines, and a 

 clavate glabella having four pairs of furrows ; large, pimctate, and 

 strongly margined fixed cheeks, each a quarter of a circle in shape, and 

 reaching nearly to the front of the glabella, against which the 

 extremely long eyes abut ; thence the facial suture curves out- 

 wards, and is marginal in front. The long eye-lobe which forms 

 the margin of the fixed cheeks reaches quite to the glabella in front, 

 and veiy nearly to the posterior angle below. The free cheeks are 

 a narrow band, margined, and reaching only three-fourths down the 



* We have now (October 1865) in all 33 species, distinct and confined to this 

 formation, for which the new term " Ma?nevian Group " was proposed, Sept. 

 1865, at the Meeting of the British Association at Birmingliam. 



VOL. XXI. — PART I. 2 K 



