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. 
Dalmania, Emmrich {iion Desvoidey, 1830),* Jahrb. fur Min., 
1845, p. 38. 
Odontochile, Corda (non Laporte, 1834), f 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. 
Dalmanites, Barrande, Loc. cit., p. 918, and Expl. Plates, Atlas i. 
Dahianiles, Barrande, Loc. cit., 1872, Suppl. Vol. i. p. 27. 
Phacops (Odontochile), Salter, Mon. Brit. Trilobites, 1864, Pt. 1, 
p. 15. 
Dalmanites, Hall, 11th Ann. Rep. Geol. Survey Indiana, 1881, 
p. 329. 
Dahnanites (Hausmannia), Hall and Clarke, Pal. N. York, 1888, 
vii. pp. xxix and xxxi. 
Obs. — 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 group 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 previously 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. 
