Dr. H. Woodward — Culm Trilohites from North Devon. 485 



be compared with G. longiceps of Portlock, from the Carboniferous 

 Limestone of Ireland, but the Irish species attains to almost twice 

 the size of Mr. Barke's example from Glamorganshire. 



The general outline is ovate-oblong ; the glabella is smooth, very 

 gibbous, and pyriform ; the basal lobes are rather small and obtusely 

 triangular, and not nearly so prominent as in G. longiceps ; the axial 

 portion of the neck-lobe is moderately broad, and separated from the 

 glabella by a well-marked smooth furrow ; the fixed cheeks are very 

 narrow, but the suture is not distinctly seen in the specimen 

 anteriorly ; eyes one-third the length of the head, reniform, surface 

 finely faceted ; raised inner portion of free cheeks rather narrow, 

 surface smooth, outer margin wide, posterior angles produced into 

 broad and stout spines, reaching to the 6th segment of the thorax ; 

 thorax composed of nine free segments, the axis arched, equalling 

 one-third the breadth of the thorax, each segment of the axis having 

 a row of minute granules along its posterior border, none visible on 

 the pleuree ; angles of pleuras bluntly terminated (not rounded as in 

 G. longiceps) ; pygidium composed of thirteen coalesced somites, the 

 posterior margin of the axis of each one bearing a row of minute 

 granules, similar to those on the axis of the free segments ; axis 

 tapering to the extremity, and rather more pointed and more slender 

 than in G. longiceps ; ribs nine in number, not granulated, separated 

 from the lateral margin by a broad, striated border, which is widest 

 posteriorly. [The Hypostome. — Fig. 15 on Plate XX represents 

 the hypostome seen in situ in the head of Fig. 14. It closely 

 resembles the hypostome of Griffitliides, see H, Woodward's Mon. 

 Carb. Trilobites : Pal. Soc, 1883, p. 30, pi. vi, fig. 5, which may 

 have belonged to G. longiceps.'\ 



Compared with the species nearest to it G. BarTcei differs from 

 G. longiceps in the following particulars : — 



The glabella in G. Barlcei is broader in proportion anteriorly and 

 narrower and more pointed posteriorly than in G. longiceps ; the 

 basal lobes are smaller and much less prominent ; the eyes are 

 placed slightly more posteriorly, and abut upon the basal lobes and 

 the neck-lobe ; there is no tubercle on the basal lobe ; the row of 

 minute granules on the posterior border of each segment is confined 

 to the axis of both the thorax and the pygidium ; the pleuree are 

 bluntly terminated, not rounded ; lastly, tlie ribs in the pygidium do 

 not reach the margin as in G. longiceps, but are separated by a broad 

 (striated) margin which widens posteriorly. These differences, 

 together with its much smaller size, suffice to separate G. Barlcei 

 specifically from G. longiceps, than which there is no other so closely 

 related to it. I have much pleasure in naming it after its 

 discoverer, Mr. Frederick Barke, F.G.S., of Stoke-on-Trent. 



Concerning the horizon of Griffithides Barlcei, Dr. Wheelton Hind 

 writes : — " It was obtained at Bishopston, Glamorganshire, from 

 a series of desilicified cherts which rest upon the Carboniferous 

 Limestone massif, and immediately overlying which are beds with 

 fossils of the Pendleside series. These cherts would be veiy close 

 to the horizon of the beds on the Hodder at Stonyhurst, where 



