BY R. ETHERIDGE^ JUNR., AND JOHN MITCHELL. 673 



Log. and Ilor. — Gurnett's Farm, three miles west of Bowning, 



on the Binaloncf Road, and the west side of the Bowninsr Anti- 

 cs ' o 



cline, Parish Bowning, County Harden; Bowning Series (pro- 

 bably Lower Trilobite Bed), Upper Silurian. 



b. — With the above occurs a form of cephalon (Pi. Iv., fig. 8) 

 which to us seems to agree so closely with the cephalon of E. 

 etherldyei, that we place it with that species provisionally. The 

 occurrence of pygidia in association with it which we, at present, 

 are unable to separate from the pygidia of E. etheridgei, gives 

 support to this conclusion. 



c. —Still another cephalon (PI. Ivi., fig.l2) occurs with the two 

 preceding ones, which we are unable to determine specifically. 

 Its fixed cheeks resemble those of F. mitchelli', but its glabella 

 is much more robust and more strongly tuberculate than is that 

 of the latter. The neck-annulation and its lateral extensions 

 are more strongly arched and tuberculate than is the case in E. 

 mitchelli. No portions of the latter species have been found in 

 the same locality. 



Loc. and //or.— Gurnett's Farm, Parish Bowning, County 

 Harden, (1) Upper Silurian (Coll. Mitchell). 



2. Pygidia. 



fi. — The follo\ving( Pl.lv., figs. 10, 11) are the sp-cific characters 

 of a number of pygidia collected from Gurnett's Farm, west of 

 the Bowning Anticline, and which have been referred to in our 

 description of some cephala from the same place Acutely tri- 

 angular, slightly wider than long, very much arched transversely 

 and longitudinally, evidently finely granulate; axis very wide in 

 front, decreasing gradually posteriorly and terminating in a 

 moderately fine point closely invested by the last pair of pleurae, 

 not at all prominent, very slightly arched, annulations continuous 

 throughout when testaceous as are most of the specimens under 

 our notice; but on nontestaceous specimens a distinct central 

 space appears to be present, and only the first three annulations 

 or so are continuous; medial tubercles seldom visible, and when 

 so are faint (testaceous); pleurae of twelve to thirteen pairs of 



