CARBONIFEROUS FOSSILS OF IRELAND. 161 



Gkiffithides longispinus. Portk. 



Grifiitliides longispinvis. Portk. Geo). Rep. 



I have seen very imperfect fragments only of this species ; tlie pygldium is wider and larger than in the 

 G. loHi/iceps, but similarly marked. I have not seen the head. 



Gkiffithides obsoletus. Phil. sp. 



Asaphus obsoletus. P/iil. Geol. York. 



This very curious species resembles the G.ghhiceps in general form, but has the head marked with trans- 

 verse, waving striae, unlike any other TriboUte I know). Its head is very rare, only one imperfect fragment 

 having been seen; the pygidium figured by Prof Phillips resembles that o[ the G. (/lobiceps, and probably 

 does not belong to the head. 



PhILLIPSIA CfELATA. M'Col/. (PL IV. fig. 4). 



Sp. Ch. — Glabella ovate, convex, rounded in front, attenuated behind, to a narrow neck ; neck furrow 

 very strong ; first cephalo-thoracic furrow deep, enclosing a semicircular, convex space, above which are, on each 

 side, three others shorter and more shallow ; limb bordering the cephalothorax, broad, convex, when decor- 

 ticated, marked with twelve or thirteen fine continuous strise ; surface of cephalo-thorax closely sculptured with 

 a fine, scale-like granulation ; neck tubercle distinct. 



The only specimen which has occurred of this very interesting Trilobite is imperfect as to the cheeks, but 

 there are so many excellent characters to distinguish it, that the smallest fragment could be recognized. In 

 structure it presents some variations from the characters of the genus, as defined by Captain Portlock ; the form 

 of the glabella is rather that of Grijfithides than Phillipsia, but it has the cephalo-thoracic furrows of the latter 

 genus ; these furrows arc four in number, or three exclusive of the semicircular basal one ; that is, one more on 

 each side than accords with that author's view of the genus. I have observed, however, the same number in the 

 P. Jonesii. Length of glabella three lines, greatest width of glabella one and a-half lines. 



Phillipsia colei. M'Coi/. (PI. IV. fig. 6). 



Sp. Ch. — Elongate, oval; length rather less than twice the width; sides parallel; cephalo-thorax smooth; 

 glabella rounded in front, but not encroaching on the margin, slightly convex, constricted at the sides ; cephalo- 

 thoracic furrows distinct, cheeks large, flattened ; wings narrow, ending posteriorly in short, triangular spines ; 

 eyes small, lunate. Thorax, axal lobe rather wider than the lateral ones ; each segment having a row of minute, 

 crowded, irregular granulations ; pygidium rounded, margin broad, finely granulated, each segment having a 

 row of numerous, crowded, very unequal granulations, larger than those of the thorax. 



This species resembles the P. Kellii, Port., but is easily distinguished by the character of the granulation 

 of the segments. Length eleven lines, width six lines; length of glabella four lines, width six lines. I have 

 dedicated this elegant fossil to the Earl of Enniskillen. 



Phillipsia (?) DiscoKs. il/'C'oy. (PI. IV. fig. 7). 



Sp. Ch. — Pygidium semielliptical ; axal lobe reaching to the margin, one-third less in width than the 

 lateral lobes, very convex, composed of seventeen narrow segments, the third and fourth unite in the middle 

 of the lobe to form one large tubercle, and towards the apex there are four or five small tubercles, irregularly 

 disposed ; the lateral lobes have only six large, rounded segments, each terminating at the margin In a large, 

 rounded tubercle, and having usually between the margin and the axal lobe, two other large, obtuse tubercles, 

 one of these on the third and last, being largest, and probably spiniferous ; besides these there are a few irre- 

 gidar granules, especially towards the apex, all the lateral segments seem forked from nearly their origin. 



I have included this very remarkable trilobite in the genus Phillipsia, Portk., although I think there can 



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