104 TRILOBITES OF GIRVAN. 



Collection,— -Mrs. Gray (f. M.). 



Horizons and Localities. — -Drummuck Group (U. Bala) : Thraive Glen ; Drum- 

 muck. ? Balclatchie Group (Llancleilo) : Ardmillan. 



7. Lichas (Metopolichas) bulbiceps, Phillips (?), 1873, var. Plate XIV, fig. 14. 



1873. Lichas bulbiceps, Phillips, MS. (?), Cat. Camb. Silur. Foss. Mus. Pract. Geol., p. 39. 

 1896. Lichas bulbiceps, Eeed, Quart. Journ. Geol. Soc, vol. lii, p. 428, pi. xxi, figs. 8, 8 a, 8 b, 9. 

 1902. Lichas (Metopolichas) bulbiceps, Eeed, Quart. Journ. Geol. Soc, vol. lviii, pp. 73, 82. 



Remarks. — There is a single cast of a nearly perfect head-shield from the Star- 

 fish Bed in Mrs. Gray's collection, which seems to belong to a variety of L. 

 bulbiceps, Phillips. It agrees in all its essential characters with this species, but 

 the first lateral furrows are connected with the occipital furrow by a strong 

 longitudinal furrow running from the base of the bicomposite lateral lobes to the 

 inner angle of the occipital lobes. A similar furrow is seen in some examples of 

 the allied L. verrucosus, Eichw. 1 The second lateral furrows are also well-developed, 

 and join the curved ends of the first lateral furrows, so that the bicomposite lobes 

 are completely circumscribed by continuous furrows of uniform strength. The 

 axial furrows outside the subquadrate fourth ("middle") lateral lobes are weak, 

 and there is a faint arched furrow across the median lobe of the glabella connecting 

 the bases of the bicomposite lobes. 



Some of these differences in the furrows may be due to the specimen having 

 lost its shell and being in the state of an internal cast, but I do not think they are 

 sufficiently important to warrant our considering it as more than a variety of 

 L. bulbiceps. 



Collection. — Mrs. Gray. 



Horizon and Locality. — Drummuck Group (U. Bala) : Starfish Bed, Thraive 

 Glen. 



8. Lichas (Metopolichas) aff. marginatus, Lindstrom, 1885. Plate XIV, 

 figs. 15, 1G. 



Remarks. — One large head-shield, 25 mm. long and 22 mm. wide between the 

 facial sutures on the front margin, is in Mrs. Gray's collection from the Middle 

 Llandovery of Woodland Point. Though somewhat flattened by pressure it is 

 sufficiently well preserved and interesting to merit a special description. The 

 glabella is about 20 mm. long, with a pair of large, oval, elongate, bicomposite lobes, 



1 Schmidt, ' Eev. Ostbalt, Silur. Trilob.,' pt. ii, p. 62, pi. ii, fig. 6. 



