A NEW PERMO-CARBONI FERGUS GENUS (KEEN EI A) 



OF PLEUROTOMARIID^, and a STRAPAROLLUS in 



NEW SOUTH WALES. 



By R. Etheridge, Junr., Curator. 



(Plates xxxii. -xxxiii.) 



The Lower Marine Series of our Permo-Carboniferous in the 

 Maitland District has yielded a fine Gasteropod, that I believe 

 constitutes a new sub-genus of Pleurotomaria, or genus of Pleuro- 

 tomariidse, as the idiocyncracies of the reader may lead him to 

 regard it. The characteristic univalve of the series mentioned is 

 Platyschisma oculns, Shy., sp., but occurring side by side with 

 this, and in some respects like it, is another much larger and more 

 massive shell, quite undescribed with us, that I propose to designate 

 as Eeeneia platyschismnides. The generic name is given in honour 

 of the late Mr. William Keene, for many years Examiner of Coal 

 Fields for New South Wales, and whose researches, combined with 

 those of the late Mr. 0. S. Wilkinson, laid the foundation for our 

 present knowledge and classification of the New South Wales Coal 

 Measures. Mr. Keene's writings will be found in the early 

 publications of the Department of Mines, Sydney, the Quarterly 

 Journal of the Geological Society of London, and various Exhibi- 

 tion Catalogues and Reports referring to New South Wales. 



Eeeneia is an umbilicate Pleurotomaria, and hence need only 

 be compared with those so-called sub-genera of the genus in chief 

 possessing an umbilicus. The principal features in the so-far 

 only known species, irrespective of its size and umbilicus are: — 

 (a) visible presence of the band only on the body-whorl; (6) band 

 in the same plane as the surface of the body-whorl, not raised or 

 bordered by carinas; (c) sutural and concealed position of the 

 band on the other whorls ; {d) absence of a keel surrounding the 

 umbilicus. 



The umbilicate "sub-genera" of Pleurotomaria, with which it 

 is necessary to compare Eeeneia, are: — Mourlo7iia, de Koninck; 

 Rhineoderma, de Koninck; Yvania, Bayle; Luciella, de Koninck; 

 Leptomaria, Deslonchamps, and others named below, but I omit 

 from consideration Talayitodiscus, Fischer; Pyrgotrochus, Fischer; 

 Eniemnotrochus, Fischer; and Pleurotomaria proper, as typified 

 by P. anglica, Desh. The relation may be expressed in the 

 following table : — 



