Palaeozoic Bivalved Entomostraca. 35 



Methil, Fife, in blackband ironstone, with fossils as before. 



Methil, Fife, in soft hematite, with Ganoid scales. 

 Carboniferous Limestone series : 



Rae's Gill, Carluke, Lanarkshire, in clayband ironstone. 



Crossgatehall, near Edinburgh, with fossils as before. 

 Calciferous Sandstone series : 



Fife coast, west of Pittenweem, in blackband ironstone, 800 

 feet below the base of the Carboniferous Limestone, with 

 fossils as before. 



Fife coast, near Billow Ness, in dark shale, 2950 feet below 

 the base of the Carboniferous Limestone, with Rhizodus 

 scales, Spirorbis sp., Cyclopteris ? flabellata, Brong., and 

 Lepidophyllum. 



Fife coast, near Kilrenny Mill, Anstruther, in ironstone, 

 about 3500 feet below the Carboniferous Limestone, with 

 Carbo.iia fabulina &c. as above. 



A form very similar to, if not identical with C. Rankim'ana 

 occurs in the Yellow Sandstone of Cultra, Holywood, Ire- 

 land, low down in the Carboniferous series (see Ann. & 

 Mag. Nat. Hist. ser. 3, vol. xviii. p. 49) . 



3. Carbonia subula, Jones and Kirkby. 

 (PI. III. figs. 9-13.) 



Cythere subula, J. & K. Trans. Geol. Soc. of Glasgow, 1867, vol. ii. 

 p. 222. 



Very elongate, subcylindrical. Dorsal border slightly con- 

 vex ; with an easy slope to the anterior extremity, which is 

 relatively broad, and projectiug above ; and with a more 

 abrupt and deeper slope to the posterior extremity, which is 

 rounded or, in some examples, bluntly pointed ; ventral border 

 straight or very slightly concave where the right valve seems to 

 show a small overlap of the left. Dorsal and ventral aspects 

 lenticular. Surface smooth, so far as known. Length (^ inch) 

 nearly four times the height. 



C. subula has the greatest length compared with height of 

 all the Carbonue. We, in a measure, assume that it belongs 

 to this genus, not having seen specimens with the muscle- 

 spot *, though casts showing the transverse furrow, as noticed 

 in G. RanMniana and C. Agnes, have repeatedly occurred to us. 

 Moreover the general habit of the carapace is the same as in 

 the species previously described. 



It is found in the Calciferous Sandstone and Carboniferous 

 Limestone series. It has not been seen in the Coal-measures. 



* Mr. John Young informs us that he has seen what he considers to 

 be the muscle-spot of this species. 



3* 



