PROETUS. 81 



Remarks. — The descriptions previously given of this species have been meagre 

 and incomplete. It is represented in most collections of Llandovery fossils from 

 the Grirvan area, and shows the typical characters. The poor specimen which 

 Nicholson and Etheridge (op. cit.) figured from Bargany Pond Burn as " Proetus ! or 

 Acidaspis ? " is perhaps referable to this species. 



Lindstrom (op. fit.) placed this species in the genus Phaetonides, but it lacks the 

 characteristic spines on the margin of the pygidium, and it appears doubtful if 

 Phaetonides can in any case be regarded as more than a sub-genus of Proetus. 1 



( 'oiler! ions. — Mrs. Gray (f. M.) : Edinburgh Museum ; Woodwardian [Sedgwick] 

 Museum. 



Horizons and Localities. — Mulloch Hill Group (L. Llandovery) : Mulloch Hill. 

 Saugh Hill Group (M. Llandovery) : Newlands ; Woodland Point. Camregan 

 Group (U. Llandovery) : Camregan Wood ; Bargany Pond Burn. Penkill Group 

 (Tarannon) : Penkill. 



G. Proetus cf. obconicus, Lindstrom. Plate XI, fig. 12. 



Remarks. — There is a head-shield from Woodland Point which much resembles 

 P. obconicus, Lindstrom,' in the shape of the glabella, position and size of the 

 eyes, distinct occipital lobes and median tubercle on the neck-ring. From 

 /'. procerus it differs in the broader, more oval glabella ; in the eyes being relatively 

 larger and situated considerably behind the middle of the glabella and therefore 

 much further back ; in the possession of w r ell-marked occipital lobes, which are 

 always indistinctly defined in 1'. procerus ; and in the median tubercle of the neck- 

 ring. 



Collection. — Mrs. Gray. 



Horizon and Locality. — Saugh Hill Group (M. Llandovery) : Woodland Point. 

 ? Mulloch Hill Group (L. Llandovery) : Mulloch Hill. 



7. Proetus, sp. ind. Plate XI, fig. 13. 



An incomplete head-shield and its impression from the Lower Llandovery of 

 Oraigens seem to indicate a new species of Proetus, bat the material is hardly 

 sufficient to attach to it a new specific name. 



Description. — -Head-shield with broad, thick, raised and rounded border. Glabella 

 about two thirds the length of head-shield, oval, truncated behind, pointed 

 acutely in front, gently convex, with traces of two pairs of short oblique lateral 

 furrows ; front end of glabella separated from border of head-shield by wide 

 flattened horizontal pre-glabellar area. Occipital lobes distinct at sides of neck- 



1 Oehlert, 'Bull. Sue. Et. Scieut. d' Angers,' 1885, pp. 5, 8. 



2 Lindstrom, ' Ofv. K. vet, Akad. Forhandl.,' 1885, No. 6, p. 78, pi. xv, Bgs. 22—24. 



11 



