Genus Agnostics. — Vogdes. 387 



Agnostus acadicus var. declivis Matthew, 1885. ,P1. ix, fig. 8. 

 The author compares this species with A. secretus Walcott. 



Agnostus regulus Matthew, 1885. Plate x, fig. 11. 



Diagnosis. — Head elongate, semi-elliptical, with straight sides^ 

 posterior contour .broken by the projecting glabella, and narrow 

 occipital ring. Dorsal furrow distinct, marginal furrow and 

 limb sharply defined; the latter diminishes towards the posterior 

 angles of the head. Glabella large, consisting of two lobes; the 

 anterior lobe semi-circular, wider than the posterior lobe, elevated 

 above the general contour of the surface and undulate with 

 broad furrows, radiating from the back of the lobe; posterior 

 lobe flattened, cylindrical, with a faint broad median transverse 

 furrow interrupted at the summit of the glabella by a node, 

 elongated on the line of the axis. The cheeks are narrowed in 

 the middle, there being a crescent-shaped limb in front of the 

 anterior lobe of the glabella, and an expanding cheek on each 

 side of the posterior lobe of the glabella. 



The pygidium is elliptical. The axial lobe large, high, obtusely 

 Clavate, constricted in the centre and divided into three lobes; 

 the middle lobe is larger than the combined length of the other 

 lobes, and has a median ridge-like tubercle. This lobe is indented 

 in the middle of its length on each side by a short furrow ; the an- 

 terior lobe is narrow and ring-like; the posterior lobe is sub- 

 lunate. Limb distinct. The side lobes of the pygidium narrow 

 in rear to conform with the axis. 



Locality. St. John group, at Portland, Hanford and Porter's brook, 

 St. Martin's. 



This species is of the type A. rex Barr. 



Section PARVIFRONTES. 

 Agnostus umbo Matthew, 1885. Plate x, fig. 9. 

 Diagno.ns. — Head broadly transversely elliptical, high and 

 contracted behind, sloping from the glabella in all directions. 

 Marginal fold and furrow strongly marked. Dorsal grooves dis- 

 tinct. Glabella suborbicular, rounded in front, and behind 

 bearing a small tubercle on the axial line, ^ from the front. 

 Length of the glabella ^ that of the head. Pygidium semi-ellip- 

 tical. Dorsal and marginal furrows deeply impressed; axis coni- 

 cal and greatly elevated above the rest of the pygidium; it bears 

 a small tubercle ^ from the front. The limb is rather wide at 



^P^ OP thb'^C^ 



