150 TRILOB1TES OF GIRVAN. 



the posterior lateral angles, and deeply notched on each side anteriorly. A very 

 narrow band also runs round the front end of the body, but no lateral wings are 

 preserved. 



Collection. — Mrs. Gray. 



Horizon and Locality. — Balclatchie Group (Llandeilo) : Dow Hill. 



8. Cheirurus, subgen. et sp. ind. (//). Plate XIX, fig. 14. 



A slightly different type of Cheirurid hypostome occurs at Balclatchie, and is 

 represented in Mrs. Gray's collection. Its true specific reference is doubtful. 

 The body is subcorneal and convex, bluntly pointed behind, with a pair of oblique 

 lateral furrows close to the posterior end and nearly meeting in the middle. A 

 small median tubercle is situated on the granulated surface of the body. A narrow 

 band surrounds the anterior end, but a swollen rounded border runs round the 

 sides and posterior end ; the border is deeply notched on each side at the front, and 

 is separated sharply from the body. 



Collection. — Mrs. Gray. 



Horizon and Locality. — Balclatchie Group (Llandeilo) : Balclatchie. 



Genus DEIPHON, Barrande. 

 1. Deiphon forbesi, Barrande, 1850. 



1850. Deiphon forbesi, Barrande, Haidinger's Berichte, p. 6. 



1852. Deiphon forbesi, Barrande, Syst. Silur. Boheine, vol. i, p. 814, pi. xxxix, figs. 50, 55. 



1854. Deiphon globifrons, Angelin, Pal. Seand., p. 66, pi. xxxiv, fig. 7. 



— Deiphon forbesi, Morris, Cat. Brit. Foss., 2nd ed., p. 106. 

 1859. Deiphon forbesi, Murchison, Siluria, 2nd ed., pp. 262, 539. 

 1865. Deiphon forbesi, Woodward and Salter, Chart Foss. Crust., p. 13. 



— ■ Deiphon forbesi, Salter, Mon. Brit. Trilob., p. 88, pi. vii, figs. 1 — 12. 

 1877. Deiphon forbesi, Woodward, Cat. Brit. Foss. Crust., p. 147. 

 1885. Deiphon forbesi, Lindstrom, Frdteckn. G-otl. Silur. Crust. (Of v. K. Svensk. Vet, Akad. Forhandl., 



no. 6), p. 51, pi. xiii, figs. 9, 10; pi. xv, figs. 18—20. 

 1899. Staitrocephalus globiceps, Mem. Geol. Surv., Silur. Bocks Brit., vol. i, Scotland, pp. 532, 689 

 (nun Deiphon forbesi, p. 688). 



This species is represented only by a portion of the head-shield and some 

 imperfect thoracic segments from Mullocli Hill. Nicholson and Etheridge were 

 light in denying its occurrence at Balclatchie (M, fasc. i, 1878, p. 121). 



( Collection. — Mrs. Gray. 



Horizon and Locality. — Mulloch Hill Group (L. Llandovery) : Mullocli Hill. 



