448 Dr. A. Dohrn on Eugereoii 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, rohusta — a circumstance that confirms the opi- 

 nion expressed in the British-Musemii ' 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. L Iclotea anmdata, Dana. 



Fig. 2. Galathea monodon, Milne-Edwards (young), natural size : c, cai'a- 



pace slightly enlarged ; k, first pair of pereiopoda. 

 Fig. 3. Uca Cumiinghami, n. sp., $ , nat. size : P, pleon, seen on the outer 



side ; P", the same, inside, in situ, showing : — p, pleopoda ; 



V, young crabs ; z, termination of intestinal track ; t, one of the 



pleopoda. 



LI. — On Eugereon Boeckingi and the Genealogy of the Arthro- 

 poda. By Dr. Anton Dohen*. 



The Eugereon [described and figm-ed by the author in 

 Dunker's ' Palgeontographica,' Bd. xiii.] was found in an iron- 

 stone-pit belonging to M.Boecking, near theAbenteuerhiitte, in 

 the district of Birkenfeld. The stone containing it is an argil- 

 laceous sphgerosiderite, 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- 

 gosauruSy 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 Saarbrtick; 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, Miamia 

 and Hemeristia^ for both of which he requires the establish- 

 ment of new families, Palseopterina and Hemeristina, — and also, 

 from the still lower Devonian strata of New Brunswick, wings 

 which he identifies as those of Ephemeridee, but one of them 



* Translated by W. S. Dallas, F.L.S., from the ' Stettiner entomolo- 

 gische Zeitung,' Jahrg. xxviii. (1867) pp. 145-153. 



