THE FAUNA OF THE ST. JOHN GROUP. 103 
of one inch focus, the rest of the surface of the test, which appears smooth to the eye, is 
seen to be covered with very minute granulations. 
The following measurement will give a more complete idea of the form of this head : 
















Suture. Axial Diameter. Transverse Diameters. 
3 La Glabella. Basal. Middle. | Anterior 
Sulmo|s:l MS |" ES F fe 
L 2816 22) S2|S,% 242 - istortion. 
Length Be) ae Be | ele fis ee ME RE Distortion. | 
Belkos|sa| Solleslog| Eo] 2 | LS LES | ea) = lee] = 
a2 |S2| 45 | ae||S™ Be 55 | #2 22|52|23| 3 64) 2 
LUE = = 
| Ré) LÉ) 338] & 
| | 
| | | 
CCE | nil ws le ke ¢ _ E 
41 millimetres. |°11 |-45 |-22 |-17 |/?*12 |?09 |-12 fe -03 ||22 |:27 |-36 je 22 |-69 k/x 
\ | 








Locality—Found at Portland in Division 1 c. 
The numerous raised lines on the anterior margin of this variety, as well as the sharp 
sinus in the anterior part of the suture, seem to associate this head with a moveable cheek 
similarly characterized, and the pygidium found with this form differs from the ovate 
pygidium of common occurrence, which is to be associated with P. eteminicus. It is probable 
that when better known pontificalis will be found to be a distinct species. 
As a further aid to the discrimination of these closely allied forms, and to show their 
distinctness, the following table, based on the relative proportions of the adult forms, will 
be of service :— 











| 
Cords of Suture. Middle Transverse 
Diameter. 
Form of Fourth 
anterior furrow Proportion of the Proportion of the 
Name. : 2 £ 
sinus of from front || Posterior ) | Anterior || Fixed , ( Glabella 
i to Eye-lobe &| to 4 at first 
Facial Suture. of Dome. || Margin. Margin. || Cheek. furrow. 
more } 3 
var. breviatus. | short and open.) than f ° 1 4°35 2-65 1 1:58 
“  suricoïides. | broad and deep. 1 4°35 2°60 1 1:57 
sp. eteminicus. | broad and open. 3 1 4°25 2°50 1 1°43 
var. malicitus. ? ? 1 | 4°65 rg 1 0°94 
‘“ quacoensis. | broad and open. 3 1 2-40 1:40 1 1:53 
“ pontificalis. | sharp and deep. 2 1 3°85 1:85 1 1:80 




PARADOXIDES ACADICUS. (Figs. 16-18). 
The anterior margin is regularly rounded and strongly arched backward. The 
marginal fold is moderately convex and about twice as wideat the extremity as in front 
of the glabella. The flat area is very small, and at the suture about as wide as the 
marginal fold. 
The glabella is about an eighth longer than wide ; it expands regularly from the base 
