SPECIES OE MTTRCHISONIA. 



621 



MURCHISONIA ANGULATA, PhiU. ? (PI. XXIV. figS. 1,2.) 



Uosteilaria angulata, ? J. Phillips, 1836, 1 Geol. Yorks.' vol. ii. p. 230, 

 pi. xvi. fig. 16 (dextra). 



Non Murchisonia angulata, J. Phillips, 1841, 4 Pal. Foss. of Devon,' 

 p. 101, pi. xxxix. fig. 189. 



Non Murchisonia angulata, A. d'Archiac and E. de Verneuil, 

 1842, 'Trans. Geol. Soc' 2nd ser. vol. vi. p. 356, pi. xxxii. figs. 6, 7. 



Non Murchisonia angulata, A. Goldfuss, 1841-44, ' Petr. Germ.' 

 vol. iii. p. 25, pi. clxxii. fig. 5, a, b, c. 



Non Murchisonia angulata, J. E. Portlock, 1843, ' Geol. Rep. 

 Londonderry/ p. 418, pi. xxxi. fig. 5. 



Murchisonia angulata, H. G. Bronn, 1848, ' Index Palaeontol.' 

 p. 747. 



Murchisonia angulata, A. d'Orbigny, 1850, ' Prodr. de Paleont. 

 stratigr.' vol. i. p. 122. 



Murchisonia angulata, J. Morris, 1854, ' Cat. Brit. Eoss.' p. 258. 



Murchisonia angulata, ? A. Sedgwick and E. M'Coy, 1855, ' Brit. 

 Pal. Rocks,' p. 531. 



Non Pleurotomaria angulata, E. d'Eichwald, 1860, ' Lethaea 

 Rossica,' vol. i. sect. ii. p. 1180. 



Non Murchisonia angulata, J. Armstrong, J. Young, and D. 

 Robertson, 1876, ' Gat. of the West. Scot. Eoss.' p. 56. 



Murchisonia angulata, J. J. Bigsby, 1878, ? Thes. Devonico-Car- 

 boniferns,' p. 325. 



Xon Murchisonia angulata, L. G. de Koninck, 1883, ' Eanne dn 

 Calc. Carb. de la Belgique,' vol. viii. pt. 4, p. 18, pi. xxxiv. fig. 4. 



As will be seen from the above synonymy, considerable confusion 

 has arisen with regard to the identification of the Murchisonia 

 angulata of Phillips, owing to his having described three distinct 

 species under this name. In 1836, in the ' Geol. Yorks.' vol. ii. 

 p. 230, pi. xvi. fig. 16, Phillips figures and describes two different 

 Carboniferous shells as Rostellaria angulata; and in 1841, in the 

 4 Pal. Foss. of Devon/ p. 101, pi. xxxix. fig. 189, he figures and 

 describes a Devonian shell as Murchisonia angulata, identifying it 

 with the shells previously described as Uostellaria angulata, and 

 referring them all to the genus Murchisonia, d'Arch. & de Yern. 

 This last shell is evidently quite distinct from those first described, 

 being much smaller and the keels being differently disposed ; the 

 only point of resemblance being that both it and the shell figured 

 on the right hand of pi. xii. fig. 16, in the ' Geol. Yorks.,' are tricari- 

 nate. With regard to the first two, it is somewhat difficult to 

 decide which should be taken as the type of the species, only one of 

 the original specimens being in existence, and that in a very imper- 

 fect state of preservation. The Gilbertson Collection in the Natural 

 History Museum contains a large number of the fossils described by 

 Phillips in the ' Geol. Yorks.,' and the other specimens, I am told, have 

 been lost. There is one shell in this collection which agrees with 

 the left-hand figure of pi. xvi. fig. 16, and which is distinguished 

 in the tray as the M. angulata figured by Phillips. It is much worn, 



