HARPES (EOHARPES) FLANAaANI. 9 



Harpes (Eoharpes) flanagani, Portlock. Plate I, figs. 7 — 9. 



1903. Harpes flanagani, Portlock, Eeed, op. cit., p. 8, pi. ii, figs. 12, 12 a. 



This species has been previously recognised and figured from the Grirvan area, 

 but several more examples have been recently obtained by Mrs. Gray, one consisting 

 of a nearly complete head-shield with the limb attached. The whole outline of 

 these Girvan examples is rather more oblong and less rounded than in H. yoiingl ; 

 the horns of the limb are more parallel, the width of the limb is more uniform, the 

 pitting on it is much coarser, the pits being fewer, larger and circular, and there is 

 tlie intra-marginal single row of specially large pits and a complete absence of fine 

 reticulating radial nervures, except near the median portion of the lower surface 

 of the limb. In addition to these features, the eyes seem to be more elevated and 

 more centrally situated on the cheeks than in H. ijoimgi. There are traces of a 

 low pre-glabellar swelling, and an indistinct cheek-roll ; the glabella appears to 

 be keeled and more oval in shape, with longer basal lobes ; the alse are larger and 

 divided in half by a crescentic furrow, and there is apparently an absence of 

 strong nervures on the cheeks. 



Portlock's^ figures of H. flanagani were poor and unsatisfactory. The specimens 

 (now in Jermyn Street Museum) represented by his figures 5 a and 6, are broader 

 and more subquadrate than that shown by his fig. 7, which may be distinct. 

 These two {op. cit., figs. 5(7, 6) also show a distinct cheek-roll with radial lines 

 of pits ; the limb is narrower in the middle in front than at the sides, and has a 

 low median swelling or fold in it as in these Girvan specimens ; similarly the al» 

 are large, and there is a distinct oblique ocular ridge swelling out towards the 

 eye, the latter being situated at about one-third the length of the cheek from the 

 front ; the intra-marginal row of pits on the limb is not very distinct. The shape 

 of our Girvan specimens more resembles Portlock's fig. 7, but in other respects 

 they agree in all important details with those represented by his figs. 5 a and 6. 



Dimensions (of specimen from Ardmillan). — 



Length of horse-shoe-shaped limb . . 22*3 mm. 



Width of head-shield including limb . . 19*0 ,, 



,, of limb at sides . . . 5*5 „ 



Affinities. — We may specially mention the American species H. ottawaensis, 

 Billings,^ of the Chazy Group, as showing many points of resemblance to 

 H. flanagani. 



Horizon and Localities. — Balclatchie Group (Llandeilo) : Balclatchie; Ardmillan. 



1 Portlock, ' Geol. Rep. Londonderry,' p. 268, pi. v, figs. 5 a, 5 6, 6, 7. 



2 Eaymond, 'Ann. Carnegie Museum,' vol. iii, no. 2 (1905), p. 331, pi. x, fig. 2 and Ruedemaim. 

 'Bull. 162 New York State Mus.' (1912), p. 116, pi. ix, fig. 1. 



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