504 
SILURIAN TRILOBITES, 
type of D. caudatus (Briinnich) Emmrich, and D. I/ausmanni, 
Brongniart." 
Under these circumstances, the adoption of Hausmanrtia in 
place of Dalmanites will surmount all difficulties in connection 
with the latter name. This suggestion is strengthened by the 
fact that Barrande's Dalmanites, as pointed out by Schmidt, 
included Trilobites not only of the type of Asaphus caudatus, but 
also all other Phacopidse which did not agree with Fhacops as 
restricted by him, and are comprised by other writers in A caste 
and Chasmops. 
Hausmannia meridianus, sp.nov. 
(PL xxxviil, figs. 1-8; PI. xl., fig. 1.) 
Fhacops ( Odontocliile) caudatus, McCoy (non Briinnich), Prod. 
Pal. Vict. Dec. iii. 1876, p. 13, t. 22, f. 1-7; t. 23, f. 7-10. 
Sp. Char. — Body. — Oblong ovoid. Head-shield or cephalon. — 
Semicircular, finely granulated, moderately inflated, surrounded by 
a thickened limb marked off from the cheeks and glabella by a 
fairly conspicuous groove. Glabella large, subpyriform, with 
straight and oblique sides, separated from the cheeks by deep and 
wide axial furrows; frontal lobes very tumose, and together sub- 
elliptical in shape, and in some specimens overhanging the 
furrows very slightly; the remaining lobes are flat and small, second 
pair subtriangular, third and posterior pair oblong; frontal 
furrows wide, and moderately deep, joining the axial furrows 
just in front of the eye, crossing the glabella very obliquely 
and almost meeting, the basal and median pairs linear, deep, 
and slit-like (in casts), and not reaching the axial furrows; 
posterior corners of basal lobes sloping rapidly into the 
axial furrows; fixed cheeks small, genal lobe* inflated, sloping 
rapidly into the axial furrow, separated from the palpebral lobe 
by a distinct groove, which anteriorly passes into the axial groove, 
and posteriorly passes round and under the eye; free cheeks large, 
* That portion of the fixed cheek between the palpebral lobe and the 
axial furrow. 
