Ji^ofrs nil ( II nihr'ni n I'liimiis. — ^fntf/nif. 2!^!> 
onlinarv Coikk-oi yphr in wliicli tliis segment is aneiiylosed in 
the pygidiuni. :ui(l not free as represented in ('. frWrnintn. 
Wherever known (except in this district of Washington county) 
the home of tlie ( '<Miocoryphea is in the Lower Paradoxides beds. 
Tliis is the casein the sontli of France, in Spain, in Wales, and even 
in Sweden. Tn tliis latter country a species has l>een found in 
the Upper Paradoxides l)eds. but still the great swarms of these 
trilobites are found in the lower l>eds. This is also strictly tlu' 
case in the St. John group. 
( )ll III II IIS IISII j>lll)illl'K, * 
The fact that this species is not intermingled at an}' localit}' 
with the Olenelli of Vermont, seems to me significant: and proba- 
bly shows that we are dealing with a fauna of a different horizon 
from that where O. thomjisfmi and O. (J/.) rrnnoiitunid occur. 
Had this species been found in a region distant from the two 
Vermont species, it might be regarded as a cotemporary regional 
variation of the type, but Iteing so near at hand the probaltlilities 
are in favour of a difference of age between the Olenelii of the 
two places. <>. iisn/i/miilis is the species whose development was 
so well shown by Mr. Fold, and liy him compared to that of 
Paradoxides. 
^Iicniil isms foil iir.nis. 
This sj)ecies shows points of close reseml)lance to those of 
the Lower Paradoxides beds. It is a composite of the characters 
of J/, (hnrsoiii i}f the St. .loliii gioiip on M. fiirciitrus of Sweden. 
Dr. Linnarsson in his esstiy on the Lower Paradoxides beds of 
Andrarum. gives a careful analysis of the layers which make up 
these beds, and of the faunas which they c<Mitain; and it niav lie 
seen that M. nirrnfnis {'onies from beds which by the contained 
fauna correspond to the highest of our Div. 1. <■ beds and the low- 
est of 1, (l\. Tims the form appears to have shown itself a little 
*Tlu.s species was originaly dt'scri'oed bv Emmous as Elliptorephohi 
fisaphoidcs, and it apjicars to me now, that this name should ha\e been 
retained; liut I use the name by which the sjiecics is commonly known. 
tFor the cnnveiiiencc of those not familiar with the series of faunas 
foimd in the St. John iironp. tlie notation is niven below: 
Division 1 (Acadian |. 
(/. No fauna known. 
h. Fauna with Agraulos articephalus. 
'•. 1. Fauna Paradox, iamellatus, c. f. oelandicus. 
''. 2. Fauna Parado.\. eteininicus c. f. runnlosus. 
(1. Fauna Paradox, abcnacns c. f. tessini. 
