448 Dr. A. Dohrn on Eugereon Boeckingi 
VIII. Caprella—Among the numerous specimens sent to 
me by Dr. Cunningham, all appear to correspond with Dana’s 
description of C. dilatata, except one, which more nearly co- 
incides with C. robusta—a circumstance that confirms the on 
nion expressed in the British-Museum ‘ Catalogue of Amphi- 
podous Crustacea,’ that the two species are but sexually dis- 
tinct. Dana’s specimens, like those of Dr. Cunningham, were 
brought up with the anchor in Rio Harbour. 
EXPLANATION OF PLATE XXL 
Fig. 1. Idotea annulata, Dana. 
Fig. 2. Galathea monodon, Milne-Edwards (young), natural size: c, cara- 
Per slightly enlarged; 4, first pair of pereiopoda. 
ca Cunninghami, n. sp.,2, nat. size: P, pleon, seen on the outer 
side; P”, the same, inside, in situ, showing :—p, pleopoda; 
Vv, young crabs; z, termination of intestinal track; ¢, one of the 
pleopoda. 
Fig. 8. 
LI.—On Eugereon Boeckingi and the Genealogy of the Arthro- 
poda. By Dr. Anton Dourn*. 
THE Eugereon [described and figured by the author in 
Dunker’s ‘ Paleontographica,’ Bd. xiii.] was found in an iron- 
stone-pit belonging to M. Boecking, near the A benteuerhiitte, in 
the district of Birkenfeld. The stone containing it is an argil- 
laceous spheerosiderite, which occurs between the carboniferous 
formation and the Lower New Red Sandstone, and which also 
contains a number of known Fishes and the celebrated Arche- 
gosaurus, together with ligneous fibres as the sole vegetable 
remains. I have lately received from the same pit an admi- 
rably preserved impression of the fore wing of a Blatta; so 
that it is to be hoped that the insect-fauna of former ages will 
be further enriched from this locality. As early as 1856, 
however, F. Goldenberg described some insects from the Coal- 
measures of Saarbriick; and still earlier, in 1842, Germar 
described several species of Blattina from the carboniferous 
rocks of Wettin. Still older discoveries have been made in 
North America: Samuel Scudder has described two new Neu- 
ropterous forms from the Coal-measures of Illinois, Méiamia 
and Hemeristia, for both of which he requires the establish- 
ment of new families, Palesopterina and Hemeristina,—and also, 
from the still lower Devonian strata of New Brunswick, wings 
which he identifies as those of Ephemeride, but one of them 
* Translated by W. 8S. Dallas, F.L.S., from the ‘Stettiner entomolo- 
gische Zeitung,’ Fairs. xxvili, (1867) pp. 145-153. 
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