PHILLIPSIA. 19 



seen, on comparison, to be identical with the pygidium of PJiillipsia Kelliiy 

 and as it does not appear likely to be easily confounded with its nearest relative, 

 P. truncatula (which species has 18 tail-segments, whilst P. gemmulifera has but 

 15), according to the laws of priority Phillips' name must stand, although based 

 upon a detached pygidium only. 



As far back as 1822 MM. Brongniart and Desmarest, in their ' Histoire 

 Naturelle des Crustaces Fossiles," figured a tail of a Trilobite from the Carboni- 

 ferous Limestone near Dublin,^ after a drawing by Mr. Stokes, but they do not 

 name it. Fischer, in his ' Oryctographie du Gouvern. de Moscou,' states' that this 

 Trilobite was named by them " Asaphus Stokesii," but, although I have made 

 diligent search, I cannot confirm this statement of Fischer's, and it seems certain 

 that Brongniart and Desmarest did not give any specific name or description of 

 this fossil, merely calling it "Asaphus." The name Stokesii must therefore be 

 attributed to Fischer, and not to Brongniart and Desmarest. 



The subjoined is Prof. Phillips' original description of A. {Phillipsia) gemmuli- 

 ferus, ' Geol. Yorks.' vol. ii, p. 240. 



" Asaplius gemmul if erics, Phillips. 



" Each abdominal lobe ornamented by six longitudinal lines of elevated puncta ; 

 the transverse furrows undulate the limb (the cast is nearly smooth). I suppose 

 Brongniart's fig. 12, pi. iv, represents this species." 



We extract the following valuable remarks by Portlock on Phillips' Asaphus 

 gemmuli ferus : 



" Professor Phillips (' Geology of Yorkshire ') has described eight species 

 of Trilobites, all of which he includes provisionally in the genus Asaphus. The 

 genera of two of these species, Asaphus granuliferus, pi. xxii, fig. 7, and 

 Asaphus gemmuUferus, pi. xxii, fig. 11, cannot be determined with certainty 

 from the figures which represent pygidia only. Of the other species, Asaphus 

 seminiferus, pi. xxii, figs. 8, 9, 10, Asaphus truncatulus, pi. xxii, figs. 12, 13, 

 and probably Asaphus obsoletus, in part, pi. xxii, figs, 3, 5, belong to the present 

 genus. On comparing Phillips' fig. 12 with pi. xi, fig. 1 b [of Portlock's Rept. 

 Geol. Lond.], a striking general resemblance will be perceived ; he, however, 

 represents the glabella as quadrisulcate, whereas the number of sulci in the Irish 

 specimens is only three, a number consistent with the view here taken of the 

 genus. The posterior angles also of the cephalothorax of Professor Phillips' 

 figure do not project backwards so far as in the Irish species ; these two points 

 of difference may, however, be the result of some slight imperfections in Professor 



1 This figure is evidently that reproduced in ' Buckland's Bridgewater Treatise,' vol. ii, p. 74, 

 pi. 46, fig. 10, stated to be from the "Transition Limestone, Dublin," and named by him '■'Asaphus 

 gemmuUferus of Phillips." 



2 In a footnote to p. 121 (op. cit., 1830—37). 



