502 SILURIAN TRILOBITES, 



The presence of the genal spines separates this species from 

 Phacops proper, but through the scantiness of our material we 

 are not prepared to enunciate a more definite opinion at present. 



Log. and Horizon. — Mansfield District, Victoria — ? Upper Silu- 

 rian. Coll. — G. Sweet, Melbourne. 



Genus Hausmannia, Hall and Clarke, 1888. 



Dalitnania^ Emmrich {iion Desvoidey, 1830),"^ Jahrb. fiir Min., 



1845, p. 38. 

 Odontochile, Corda (nan Laporte, 1834),t Prod. Mon. Boh. Trilo- 



biten, 1847, p. 92. 

 Phacops ( Dalmania ), Salter, Dec. Geol. Survey U.K., 1849, ii. p. 1. 

 Dalmania, Barrande, Syst. Sil. Boheme, 1852, I. p. 528. 

 Dalmanitesi, Barrande, Loc. cit., p. 918, and Expl. Plates, Atlas i. 

 Bahianiies, Barrande, Loc. cit., 1872, Suppl. Vol. i. p. 27. 

 Phacops (Odontochile), Salter, Mon. Brit. Trilobites, 1864, Pt. 1, 



p. 15. 

 Dahnanites, Hall, 11th Ann. Rep. Geol. Survey Indiana, 1881, 



p. 329. 



Dahnanites (Hausmannia), Hall and Clarke, Pal. N. York, 1888, 

 vii. pp. xxix and xxxi. 



Ohs. — In separating the old genus Phacops into convenient 

 sections for systematic description the late Mr. J. W. Salter 

 adopted the name Odontochile, Corda, for that grouj) typified by 

 Phacops caudatus, Emm., but for which the term Dalmania has 

 otherwise almost universally been used. The latter name, pro- 

 posed by Emmrich in 1845, had, however, been j^reviously used 

 by Robineau-Desvoidey for a genus of Diptera, and therefore became 

 invalidated as a generic name for Trilobites. Unfortunately also 

 Odontochile, proposed by Corda in 1847, was inapplicable from 

 the fact that it was made use of in 1834 by Laporte to represent 

 a genus of Coleoptera. 



• Dalmania, Desvoidey, 1830, a genus of Diptera. 

 t Odontochile, Laporte, 1834, a genus of Coleoptera. 



