On Some Carboniferous Entomostraca from Nova Scotia. 359 



so well described by himself and Sir C. Lyell. The majority of the' 

 specimens belong to the typical form of this very common and widely 

 distributed species, there being no perceptible differences to be 

 detected in them. The larger examples of the typical form are 

 about 2^7- of an inch in length, and all of them show the punctate or 

 pitted surface of well-preserved British specimens. 



With the preceding are several examples of the less-arched form 

 to which we have given the varietal name of humilis. This variety 

 in Nova Scotia possesses the same thick shell, strong amount of 

 overlap, and peculiar dorsal border that characterize British speci- 

 mens. The surface is pitted or subreticulate, as in typical examples 

 of the species ; and the length is from aVth to aVnd of an inch. 



7. — Caebonia (?) BAiRDioiDES (?), J. and K. Plate XII. Figs. 8a-d. 



Bairdia, Dawson, Acadian Geology, 1868, p. 206, fig. 48«? 



Cythere? {Garbonia?) bairdioides, J. and K., 1879, Ann. Mag. N.H. ser. 5, vol. iv. 

 p. 38, pi. 3, figs. 24, 25. 



There is also found in the tree-stump shale a larger and rarer 

 form of Carhonia (?), which reminds us of some of the simpler 



Section of Coal-Strata at the Joggins, Nova Scotia. 



ff. Sandstone. 



/. Tree, with remains of land- animals in its interior. 



e. Old land-surface. 



d. Sandstone, with plant-remains. 



c. Shale, with Entotnostraca, Spirorbis, &c. 



b. Coal. 



a. Underclay. 



forms of Bairdia. We have, however, for various reasons regarded 

 it as a near ally of C. fahulina ; and we have the same variety from 

 the Upper Coal-measures of Fifeshire, Scotland ; and a similar, if 

 not the same, form from the Calciferous-Sandstone series of the 

 same county. We have little doubt of its relationship to the fore- 

 going species. It is fully aVth of an inch long, and has a boldly 



