46 Messrs. Jones and Kirkby on Carboniferous Entomostraca. 



Ballintrillick, Bundoran." Synops. p. 166, pi. 23. fig. 2.5 ; Local, 

 p. 75. Darkish grey micaceous shale, with Aviculopecten. The 

 specimens are of the same form as " C. scutulum," and are de- 

 cidedly Leperditia Okeni, var. subrecta (about -j^ ^^^h long). 

 " C gibberula" is said to occur "in great numbers in the shale 

 of some localities." The figure indicates a large hump on the 

 middle of the valves, which Prof. M'Coy notes as remarkable ; 

 but the specimens before us are not characterized by any parti- 

 cular protuberance. 



The following labelled specimen accompanied the others. 



23. " Cy there subrecta (Portlock, sp.). Yellow Sandstone; 

 Larganmore, Bangor, co. Mayo." Griffith's List of Localities, 

 Geol. Soc. Dublin Journ. vol. ix. p. 48 ("Arenaceous shale," 

 Local, p. 100). Hardish dark-grey micaceous shale, with abun- 

 dant small obscure casts of Leperditia Okeni, var. subrecta (about 

 Vo inch long). 



The following table shows the conclusions we have arrived at, 

 judging by evidences and probabilities, respecting the Bivalve 

 Entomostraca figured in pi. 23, ' Synops. Charact. M. Limest. 

 Foss. Ireland :' — 



