384 The American Geologist. June, i892 



type A. pan- if mm Linrs. which appears with the genus Fara- 

 doxidea in Norway. The pygidium of A. jrroJongus Hall, pi. x, 

 fig. 10, has a similar form to the head of this species. The 

 author illustrates only the head. An associated pygidium has a 

 prominent axis bordered by a narrow convex space between it 

 and the limb. The axis does not exhibit lateral, or transverse 

 furrow. An elongated median tubercle is the only ornament. 



PARADOXIDES ZONE. 

 Section II, LONGIFRONTES- This section is distinguished by 

 its strongly projecting glabella and axis, which latter is generally 

 moderately long. Crust smooth. The cheeks grooved. The crust 

 on the cheeks and pygidium is provided with raised points. 

 Limb generally narrow. The cheeks in front of the glabella and 

 side lobes of the pygidium, behind the axis, divided by a groove. 

 {Agnostus imnctnosuH Kng., pi. IX, fig, 2, also yl. pUiformis pi. 

 IX, fig. 14). 



Agnostus acutilobus Matthew, 1885. Plate ix, fig. 1. 



I)iag)iosis. — Body elliptical, elongated. Head semi-elliptical. 

 Dorsal furrow faint, marginal furrow and fold sharply defined. 

 Glabella subconical, length f of that of the head. The glabella 

 is divided into two lobes ; the anterior lobe is ^ of the length and 

 subtriangular, posterior lobe extends to the base of the head. It 

 has an elongated ridge on the anterior half, with two faintly 

 marked lateral furrows on the lateral edges of this lobe. The 

 basal lobes are divided off by a sigmoid farrow and depressed 

 below the level of the glabella. Occipital ring narrow. The 

 cheeks are somewhat full especially in front and divided by a 

 furrow, each cheek is seamed across by a faint furrow. Thorax 

 of two segments ; the first has five lobes, the second onl}^ three. 

 Pygidium subelliptical. Axis is oblanceolate, nearl}' ^ as wide 

 as the pygidium and its length is about f of that of the pygi- 

 dium, narrowed in the anterior third, and crossed in that part by 

 two transverse furrows; the included lobe bears an elongated 

 tubercle ; lateral lobes of the p3^gidium moderately elevated and 

 united behind the axis. Surface smooth externally, but it is 

 granulated on the inner surface of test. 



Locality. St. John group, Porter's brook, St. Martin's. 



