ILLUSTRATIONS OF THE FAUNA OF THE ST. JOHN GROUP. 107 



TRIIiOBITA. 



PAEABOLINELLA, s. gen., Briigger. 



Paeabolinella posthuma, u. sp. (PI. VII., fig. 15a and b.) 



Nat. Hist. Soc. N.B., Bulletin No. x., p. viii. 



Head shield broadly semicircular. 



Middle piece of the head sub-trapezoidal. Front margin with a sharp narrow furrow, 

 separated from the glabella and ocular fillet by a narrow area. Glabella about as long as 

 wide, cylindrical, rounded and somewhat truncate in front ; crossed by three pairs of fur- 

 rows, faint in the middle. Occipital ring divided from the glabella, by a distinct furrow. 

 Fixed cheeks broadly sub-triangular ; ocvilar fillet short, eyelobe opposite the anterior cor- 

 ner of the glabella. Dorsal suture diverging to the anterior margin, and extending out- 

 ward to the posterior margin with a convex curve. Posterior furrow and fold narrow but 

 distinct. 



Movable cheek (including the spine) about three times as long as wide, rather wide 

 in the anterior half, and having a narrow, sharply elevated marginal fold ; produced 

 backward into a short spine. 



Sculpture. The surface of the crust is smooth. 



Size. Middle piece of the head. Length 4 mm., width 1 mm. Movable cheek. 

 Length 6 mm., width 2 mm. 



Horizon and Locality. In calcareous nodules inclosed in the black slates of Div. ^d at 

 the Suspension Bridge. Scarce. 



This little species is somewhat like P. limitis, Brog., of the Ceratopyge limestone,' but 

 is wider in the head shield and has a broader fixed cheek. The movable cheek is some- 

 what like that of Protopeltura acanlhura, Ang., but the head shield is quite different from 

 the corresponding part of that species. 



Parabolinella ? sp. 



Another trilobite occurs with the foregoing having a similar glabella and foremargin, 

 but distinguished from it by a series of crowded, forking and anastomosing raised lines on 

 the area within the anterior marginal fold. 



CYCLOGNATHUS, s. gen., Linrs. 

 Cyclognathus kotundifkons, Matt. (PI. VII., figs. 16 a and b.) 



Nat. Hist. Soc. of N.B., Bulletin x., p. viii. 



Head transversely elliptical, strongly vaulted, especially behind. 



Middle piece of the head sub-triangular with rounded angles. Anterior margin arched 

 around the glabella, depressed, deflected in front. Glabella prominent cylindrical rounded 

 in front. Smooth. Occipital ring, wide, flat, somewhat rounded behind. Occipital fur- 

 row narrow, distinct, shallow. Fixed cheek wide, sub-triangular, tumid, depressed at 



' Die Silurischen Etagen, 2 und 3, p. 102, Tab. iii., figs. 2 a 6, 4o. 



