1885.] NATURAL SCIENCES OF PHILADELPHIA. 115 



Mesoblatina dobbertinensis Gein., Zeitschr. Deutsch. Geol. Gesellsch., 1881, 570, 

 PI. 13, fig. 1. Lias of Dobbertin, England. 



Mesoblattina Murchisoni. 



Rithma Murchisoni Gieb., Ins. d. Vorw., 319. Figured by Westw., 

 Quart. Journ. Geol. Soc. Loud., x, PI. 18, fig. 43. Lower Purbecks 

 of Durdlestone Bay, England. 



Mesoblattina antiqua. 



Rithma antiqua Gieb., Ins. d. Vorw., 319. Figured by Westw., Quart. 

 Journ. Geol. Soc. Lond., x, PI. 17, fig. 10. Lower Purbecks of 

 Durdlestone Bay, England. 



Mesoblattina elongata. \ 



Blatta elongata Gieb., Ins. d. Vorw., 322. Figured by Westw., Quart. 

 Journ. Geol. Soc. Lond., x, PI. 15, fig. 23. Middle Purbecks of 

 Durdlestone Bay, England. 



