. Geological magazine. iations which the principalveins present in their arrangement (see Fig. 3). Scudder, who adopts the terminology proposed by Prof. OswaldHeer, of Zurich, writes :— These principal veins are six, countingthe marginal vein, which here merely thickens the anterior bordei,as one ; and starting from the anterior margin, they are the marginal,mediastinal, scapular, externo-median, interno-median, and anal. Thegeneral disposition of these veins is as follows :—The mediastinaland scapular veins, with their branches, which are superior { from the main vein on the upper or
. Geological magazine. iations which the principalveins present in their arrangement (see Fig. 3). Scudder, who adopts the terminology proposed by Prof. OswaldHeer, of Zurich, writes :— These principal veins are six, countingthe marginal vein, which here merely thickens the anterior bordei,as one ; and starting from the anterior margin, they are the marginal,mediastinal, scapular, externo-median, interno-median, and anal. Thegeneral disposition of these veins is as follows :—The mediastinaland scapular veins, with their branches, which are superior { from the main vein on the upper or anterior side), terminate JDr. S. Woodward—British Carboniferous Cochroaches. 51 upon tlie anterior margin. The interno-median and anal takethe ojDposite course, and their branches are inferior, or, at least,directed towards the inner margin ; while the externo-median,which is interposed between these two sets, terminates at the tip ofthe wing, and branches indifferently on either side. Anterior Posterior orinferiormargin. -^•^ Fig. 3.—Schematic view of left wing of Palaeozoic Cockroach, showing the veinsand areas (after Scudder). Now these veins are all present in both front and hind wings ofPalasozoic Cockroaches, and also in the hind wings of existing species;but in the front wings or tegmina of the latter, the number is nevercomplete, the externo-median vein being always amalgamated eitherwith the scapular, or with the interno-median, and the mediastinalfrequently blended with the scapular vein (Scudder). The following is a list of the genera and species of Blattid^ fromthe Carboniferous formation hitherto described, arranged under thefamilies and genera suggested by Scudder. Pal^eoblattari^. MylacridcB— Mylacris bretonense, Scudder, Coal-measures, „ Seerii, Scudder, ,, ,, pennsylvanicum, Scudder ,, ,, Mansfieldi, Scudder ,, ,, anthracophiluin, Scudder ,, ,, antiquum, Scudder ,, ,, lucifugum, Scudder ,, ,, carbonum, Scudder ,, ,, oval
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectgeology, bookyear1864
