HARPES. 9 



characters of the limb resemble IF. fianagani, Portlock, but the ornamentation of 

 the cheeks recalls IF. wegelini, Angelin. 



Collections. — Mrs. Gray ; Museum of Practical Geology, Jermyn Street. 



Horizons and Localities. — Balclatchie Group (Llandeilo) : Ardmillan ; Dow Hill; 

 Balclatchie. ? Stinchar Limestone Group (Llandeilo) : Craighead. 



2. Harpes, sp. ind. (a). Plate II, fig. 13. 



Remarks. — A fragment of the limb of a species of Harpes was obtained from 

 Shalloch Mill. It has a flattened surface covered with small deep irregularly 

 distributed pits, not closely set. On the inner side of the raised rounded border 

 is a single regular row of much larger equidistant pits. The border appears 

 to be transversely striated. 



This form differs from that found at Ardmillan and Balclatchie by the wider 

 border and smaller, less closely set pits. 



Collection. — Mrs. Gray. 



Horizon and Locality. — Whitehouse Group (M. Bala) : Shalloch Mill. 



3. Harpes, sp. ind. (6). Plate II, fig. 14. 



Remarks. — There is one nearly complete horseshoe-shaped limb from Bargany 

 Pond Burn in Mrs. Gray's collection, but I have not seen any other portion of a 

 Harpes from the Silurian beds of Girvan. This specimen has a length of about 

 21 mm. and a width of about 18 mm.; the breadth of the limb is almost constant 

 and is about 4< mm. The shape is subquadrate, being rather flattened in front and 

 the arms nearly parallel, but the free ends bend inwards towards each other, 

 decrease in width posteriorly, and are acutely pointed. The surface of the limb is 

 flattened and covered with very minute punctations, apparently not arranged in 

 any definite order. There is a narrow raised border round the outer edge of the 

 limb, but no row of larger pits inside it. The cheeks, which rise steeply from the 

 limb and are separated from it by a smooth groove bordered by a row of larger 

 pits on each side, arc only imperfectly preserved. They show fine radiating 

 grooves, containing very minute pits, on their surface. The portion of the cheeks 

 immediately adjoining the limb forms a distinct gently convex band, specially 

 swollen in front of the glabella and distinctly marked off from the upper part of 

 the cheeks. Harpes vittatus, Barrande (' Syst. Silur. Boheme,' vol. i, p. 3 fc9, pi. ix, 

 figs. 7 — 10), from Et. E., resembles it closely in this feature as well as in the shape 

 of the limb, curvature of the arms, punctation, and narrow raised border. 



Collection. —Mrs. Gray. 



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