INSECTS OF NEW BRUNSWICK. 41 



Sandstones and coarse shales,- with badly preserved Cordaites Hohhii Daws., C. tran- 



sitionis Goeppt., and Alethopteris discrepans Daws 26 feet. 



Fine-grained, lighi>greenish shale, with obscure remains 1 foot. 



Sandstone and shales, with Calamites and obscure markings .... 23 feet. 



Total thickness of the beds embraced in this section . . . 440 feet 11 inches. 



XI. EXPLANATION OP PLATE. 



Fig. 1. Somothetus fossilis (magn. ^). The dotted lines are oonjeotural ; the break in the dotted line 

 representing the outer border indicates the presumed amount of separation at that point to account for the 

 bending ofthe outer piece of the wing. 



Fig. 2. The same (j). With no parts restored. 



Fig. 3. Lithentomum Sarttii (^). The dotted lines show the presumed connection of the basal veins 

 with the other fragment. 



Fig. 4. Dyscritus vetustus {\). 



Fig. 5. Xenoneura antiquorum (f). The dotted lines indicate the supposed course of the veins and 

 border where they are not preserved. A portion of the base is shaded to show the exact appearance of 

 the concentric ridges; this basal portion is mostly drawn from the same stone as fig. 7, but the small fragment 

 unshaded, at the extremity ofthe anal vein, and the cross vein are drawn in from the reverse of fig. 5, shown 

 in fig. 6; so also is the larger apical piece with part ofthe lower margin, these two parts being more complete 

 on the reverse th^ on the obverse. 



Figs. 6 and 7. The same {\). With no parts restored. The apical fragment of fig. 7 is not represented ; 

 it exists; but is not so complete as in fig. 6. 



Figs. 8 and 8'. Gerephemera simplex (|). The two independent lines at the extremity of the costal 

 margin are inserted from a drawing made under the camera when only these lines and the outer margin with 

 the tip of the veins were exposed ; in working out the rest of the wing these were broken away, but are 

 here restored. The arrow indicates the direction of 8", which represents the contour ofthe surface ofthe wing, 

 the upper dotted extremity indicating the costal margin (shown to the left of the arrow), and the dots along 

 its course the position of the veins it crosses. 



Fig. 9. Platephemera antiqua {\). The faint line of dashes above the marginal vein represents the 

 margin ofthe wing, indicated on the stone by a slight darkening of the surface. The dotted lines at base and 

 at tip indicate the presumed form of the wing. 



Fig. 10. The same {\). This figure, the reverse of fig. 9, is so placed in relation to the preceding as to 

 indicate the probable expanse of wing of this insect ; a fragment at the lower angle of this specimen is not 

 preserved in fig. 9, which possesses a bit of the outer margin not found in this. 



Figs. 1, 2, 4, 6, 8, 10 represent specimens preserved in the museum of the Natural History Society of St. 

 John, N. B. 



Figs. 3, 7, 9 represent specimens in the museum of the Boston Society of Natural History. 



Fig. 5 is a composite drawing from the specimens in each museum. The Boston Society of Natural History 

 possesses the reverse of a small portion of fig. 8 ; and the St. John Society the reverse of No. 3, neither of 

 which are engraved. 



The plate was. executed by Messrs. Sinclair & Son of Philadelphia. 



