Dr. Ivor Thomas — Trilohite Fauna of Devon and Cornwall. 203 



cutting the occipital ring at a low angle. The occipital ring is 

 elevated and convex, and separated from the glabella by a deep 

 furrow. 



Locality and Horizon. — Same as the preceding. 



Remarks. — This form appears to be quite distinct from any other 

 known Phillipsia in the character of the second pair of glabella 

 lobes. "With more material it may have to be described as a new 

 species. 



LIST OF WOEKS CITED. 



1. Barrande, J, " Syst. Silur. du Centre de la Boheme," 1852, vol. i. 



2. Ibid., 1872, vol. i. Supplement. 



'2a. Clarke, J. M. " The Structure and Development of the Visual Area in 

 the Trilobite Phacops rana, Green" : Journ. of Morphology, 1889, vol. ii. 



.'J. Drevermann, F. " Fauna der (jberdevonischen Tuffbreccie von Laugenaubach 

 bei Haiger " : Jahrb. d. k. preuss. geol. Landesanst., 1900, Bd. xxi, 



4. Frech, F. "Die Karnischen Alpen," 1894. 



5. GrUMBELjCW. " Geognostische Beschreibung des Fichtelgebirges," etc., 1879. 



6. GiJRicH, G. "Das polnische Mittelgebirge " : Verhdl. d. Kuss.-kais. min. 



Gesellsch. zu St. Petersburg, 1896, Bd. xxxii. 



7. Hall, J. " Pahcontology of New York," 1888, vol. vii. 



8. " Illustrations of Devonian Fossils, Crustacea " : ibid., 1876. 



8«. HiNDE, G. J. & Fox, Howard. " On a well-marked Horizon of Eadiolarian 

 Rocks in the Lower Culm Measures of Devon, Cornwall, and "West 

 Somerset" : Quart. Journ. Geol. See, 1895, vol. li. 



9. Kayser, E. " Ueber das Devon in Devonshire und im Boulonnais " : Neues 



Jahrb. f. Min., etc., 1889, i. 



10. " Ueber einige neue oder wenig gekannte Versteinerungen des rheinischen 



Devon" : Zeitschr. d. d. geol. Gesellsch., 1889, Bd. xli. 



11. " Dechenella, eine devonische Gruppe der Gattung Phillipsia " : ibid., 



1880, Bd. xxxiv.^ 



12. Oehlert, D. "Etudes sur quelques trilobites du groupe des Proetidae " : 



Bull, de la soc. d'etudes scientifiques d' Angers, 1885. 



13. EoEMER, F. " Geognostische Beobachtuugen im polnischen Mittelgebirge": 



Zeitschr. d. d. geol. Gesellsch., 1866, Bd. xviii. 



14. Lethnea PahTozoica, 1876, i. 



15. EoEMER, F. A. " Beitrage zur geol. Kenntniss des nordwestlichen Harz- 



gebirges" : PaUrontographica, 1854, iii. 



16. Thomas, Ivor. "A new Devonian Trilobite and LameUibranch from 



Cornwall": Geol. Mag., March, 1909, x.s., Dec. V, Vol. VI. 



17. "A Note on Fhacops {Trimerocephalus) Icevis (Miinst.) " : ibid., April, 



1909. 



18. TiETZE, E. " Ueber die devonischenSchichten von Ebersdorf," etc. : Palaeonto- 



graphica, 1871, xix. 



19. TscHERNYscHEw, Til. "Die Fauna des mittleren und oberen Devon am 



West-Abhauge des Urals": Mem. du Com. geol. St. Petersburg, 1887, 

 iii. No. 3. 



20. UssHER, "W. A. E. " The Devonian Eocks of South Devon " : Quart. Journ. 



Geol. Soc, 1890, vol. xlvi. 



21. Walther, Karl. "Beitrage zur Geol. uud Pakcont. des iilteren Palaoz. in 



Ostthiiringen " : Neues Jahrb. f. Min., etc., 1907, Beil. Bd. xxiv. 



22. "Whidborne,"G. F. " A Monograph of the Devonian Fauna of the South of 



Enghiud " : Pahxjontogr. Soc, 1889, pt. i. 



23. Woodward, H. "A Monograph of the British Carboniferous Trilobites": 



Pahtontogr. Soc, 1883-4. 



24. ZiMMERMANX, H. " Trilobiteu aus dera Devonkalk des Eittberg bei Czelle- 



chowitz" : Verhdl. des naturf. Vereins in Briinn, 1891. 



25. ZiTTEL, K. vox. " Grundziige der Palaeontologie," 1895. 



