277 
F hillipsia Kellii, Portlock, 1843, Kept. Geol. Londonderry, p. 307, jd. 11, fig. 1. 
,, seminifera, J. Morris, 1843, Cat. Lrit. Loss., p. 76. 
,j gemniulifeTa, L. G. de Koninck, 1844, Descr. Aniin. Loss. Terr. Carb. Belg., 
p. 603 (non J. Phillips). 
,, Kellii, L. McCoy, 1844, Synop. Carb. Loss. Ireland, p. 162. 
,, gemmtllifera, H. Bronn, 1848, Index Pal., p. 958. 
,, ,, L. Itoemer, 1851, Lethaja Geogn., p. 595, pi. IX (2), fig. 9 (fig. 10 
exclnsa) . 
,, seminif era, J. Morris, 1854, Cat. Brit. Loss., 2nd ed., p. 114. 
,, ,, J. D. Dana, 1864, Man. Geol., p. 319, fig. 556. 
,, ,, V. 7. Moeller, 1867, Bnll. Soc. Imp. Nat. Moscou, p. 159. 
,, genimulifera, L. Eoemer, 1876, Lethsea Geogn., Atlas, pi. 47, fig. 9 (non Phill.). 
The head of this speeies is sith-semi-elliptieal ; its length is two-thirds 
the iDreadth of the base. The glabella, longer than broad, is a little nnrrower 
in its anterior part than at the base ; its neck furrow is arched and deep ; 
of the lateral grooves the posterior are oblique, and reach the neck furrow, 
with which it forms an acute angle ; the middle and anterior grooves, mueh 
less well defined, are nearly perpendicular to the lateral margins of the 
glabella, and occupy only about one-third of the total breadth of these. The 
wdiole surface is covered with small tubercles, quite visible to the naked eye. 
The cheeks are also ornamented with similar tubercles. The thorax of a 
related species being composed of nine segments, I conclude that there is tlie 
same number in this. Their pleurm are grooved, and show a series of small 
tubercles like those ornamenting the surface of the head. The contour of 
the pygidium is like that of the cephalic shield ; it is slightly vaulted cross- 
ways ; its axis consist of thirteen or fourteen distinct segments, and it ends 
in a rather blunt point. Each segment shows six small tubercles, arranged 
so as to produce a vertical series; its lateral rings are more or less oblique, 
and arched aecording to their position, and extend as far as the doublure of 
the crust. The number of the tubercles is very varial^le, the upper rings 
having seven or eight, and the lower rings three or four. 
dimensions . — The only specimen I have examined with its cephalic 
shield preserved, should be about twenty-five millimetres long. The sj)ecies 
often reaches double that length. 
