FAUNA OF THE ST, JOHN GROUP. 279 
The neck is elevated in the middle and depressed on each side near the ears, especially 
at the posterior angle. Spine more than half of the length of the ear. 
Sculpture—There are concentric raised lines as in No. 1 and 2, but they are propor- 
tionately coarser. The depressed posterior angle of the neck, which is striated in No. 2, is 
smooth in this form. There are two raised lines on the outer quarter of the posterior 
marginal fold, and about three on the spine. 
Length of the largest hypostome, exclusive of spine, 7-12 of an inch. Width about the 
same. 
Locality —Portland and Radcliff’s millstream, in Div. Ic. This hypostome is more 
common than any other, and is therefore supposed to be that of P. eteminicus and its allies. 
No. 4 (Fig. 28). 
Differs from all the preceding in the following points :—The hypostome is wider at 
the ears than across the dome; the neck furrows and the cross lobe on the neck are more 
+ prominent and narrower; the ears are thicker and flatter; the posterior spine is stout and 
nearly as long as the earlobe. 
Length, 4 inch. Width, 7-12 of an inch. 
Locality—Hanford Brook, Saint Martin’s. In Div. lc. 
EXPLANATION OF PLATE. 
Fig. 1. Moveable cheek of No. 1. Fig. 3, supposed to be young of same. 
Os, fe “3. from a higher horizon than the others. 
Er # “ 6. supposed to belong to P. acadicus. 
Figs. 5 & 6. SS cot Fig. 11, perhaps young of the same. 
Dre Laue ice “ 4, supposed to belong to P. eteminicus. 
CB) yal abs these may be young forms of P. eteminicus or its allies. 
Fig. 8. se of a large and undescribed species. 
Figs. 
[11 
13,14 & 15. Pygidia, of the type “ B.” L These forms seem to have belonged to P. pontificalis and a large 
20.& 21. ss 2 HO undescribed species. 
LOT LS de 19h a “A.” These pygidia probably belonged to P. eteminicus and related forms. 
22,23 & 24. Hypostomes. These appear to have belonged to P. pontificalis, and a large undescribed species. 
25, 26 & 27. probably pertain to P. eteminicus and its allies. 
28. ce from the eastern end of the Cambrian basin—species unknown. 
N.B.—AIl except Fig. 2 are from Group c. of the First Division of the fossiliferous Cambrian strata. The 
Moveable cheek, Fig. 2, is from Group d. of the same division. 
