REMOPLEURIDES BIOORNIR. 8:3 



The poor specimen figured by Nicholson and Etheridge as " Eemopleurides 

 sp. ind. ((>) " may perhaps be referable to R. barrandei. 



Affinities. — The transverse lineation of R. barrandei recalls the somewhat 

 similar ornamentation of R. portlocJci, Reed, 1 which, however, cannot be considered 

 a very closely allied form. With regard to its alliance with foreign species, 

 R. radians, Barrande, 2 seems to have very intimate relations, the surface of the 

 glabella being transversely striated and bearing three pairs of furrows, but the 

 shape of the glabella is more subcircular and the anterior tongue much narrower. 

 The Swedish examples 3 of E. radians seem to possess, however, a shorter, more 

 transversely urceolate glabella, and herein resemble more closely the Girvan form. 

 R. nanus, Herz. v. Leucht, 4 from the Russian Lower Ordovician, has a more 

 subcircular glabella, shorter furrows, and apparently no transverse lineation. The 

 head-shields of R. microphthalmus, Linnar., figured by Wiman, 5 bear a close 

 resemblance to R. barrandei, but seem to be devoid of the characteristic orna- 

 mentation. The narrow band round the front end of the tongue of the glabella, 

 which leads Wiman to create the new genus Robergia for its reception, does not 

 appear to be present in R. barrandei, but a similar band has been noticed in some 

 Girvan specimens of R. colbii. 



Collections. — Mrs. Gray; Museum of Practical Geology; Hunterian Museum. 



Horizon and Localities. — Balclatchie Group (Llandeilo) : Balclatchie ; Dow Hill ; 

 Ardmillan. 



2. Eemopleurides (Teratorhynchus, s.-g. now) bicornis, sp. nov. Plate V, 



figs. 5—16. 



Specific Characters. — Head-shield subpentagonal with the glabella much pro- 

 duced in front and armed with two frontal spines. Genal angles spined. 



Glabella with posterior portion broad, flattened, and embraced by large semi- 

 annular eyes; anterior portion narrower, subcylindrical, rounded, convex, not bent 

 down in front but produced horizontally to double the length of the posterior 

 portion with about half the width, tapering near anterior extremity, which is 

 furnished with a slender projecting spine slightly curved upwards and about half 



1 Eeed, ' Quart. Journ. Geol. Soc.,' vol. lv, 1899, p. 746, pi. xlix. fig. 4. 



2 Barrande, ' Syst. Silur. Boheme,' vol. i, p. 359, pi. xliii, figs. 33—39. 



:! Linnarsson, ' Vestergot. Canib. Sil. Aflagr,' pi. i, figs. 21,22, p. 67; Tornquist, ' Siljans. Trilob.,' 

 p. 36, pi. i, figs. 35—38. 



4 Schmidt, ' Rev. Ostbalt. Silur. Trilob.,' Abth. iv (1894), p. 88, pi. vi, figs. 34, 35. 



5 Wiman, " Palaont. Notiz. 3," ' Bull. Geol. Instit. TJpsala,' No. 11, vol. vi, pt. 1 (1902), p. 77, pi. v, 

 figs. 1—3. 



5 



