355 



The Foraminifera of the Older Tertiary, 

 Muddy Creek, Victoria — Addenda et 

 Corrigenda. 



By Walter Howchix, F.G.S. 



[Read March 3, 1891.] 



Plate XIII., ligs. 9, 10. 



In the paper published on the above subject (Trans. Roy. Soc, 

 S. Aus,, vol. XII., p. 10) it was stated that a very fine example 

 of what was undoubtedly a new species of Rliahdogoniuin had 

 been obtained from the Upper Bed of the Muddy Creek section, 

 but as it was mislaid at the time of publication it could not be 

 described. It has since been found, and I now submit the follow- 

 ing description. 



FAiMILY LAGENID.E. 



Genus — Rhabdogonium, Reuss. 

 Rhabdogonium exseulptum, ■•^p. nov. Plate xiii., figs. 9-10. 

 Test elongate, straight, tapering towards either extremity; 

 triangular in transverse section, exhibiting three very strong 

 longitudinal ridges, separated by deep grooves ; ridges blunt, and 

 quadrate on their outer faces. Longitudinal grooves deep, penetrat- 

 ing nearly to the centre of the test. Septal lines flush, straight, 

 and very numerous. Aperture, a circular mouth at end of pro- 

 duced neck. Length, -j^in. 



This is a somewhat remarkable form. Its nearest ally is 

 R. tricar inatum^ d'Orb., but can be readily distinguished from that 

 species by its three conspicuous keels or ridges, which practically 

 compose the whole of the shell, and also by the greater number of 

 its chambers. It is apparently restricted to the Upper Bed of 

 the Muddy Creek (? Miocene) section, in which it is rare. 



DESCRIPTION OF PLATE XIII., figs. 5-10. 



Figs. 5-8. Fahularia Hoiochiiu, Schlumberger. For descriptiout see p. 346. 



of present volume. Upper Bed, Muddy Creek. 

 Fig. 9. Rhahdogoninm exseulptum, Howchin. Lateral \'iew, showing deep 



groove. X 20 diam. Upper Bed, Muddy Creek. 

 Fig. 10. Rhahdofjonium ex-scnlpfiim, Howchin. Transverse section of test. 



