88 



The above emended generic reference is based on the study of 

 cotypes kindly transmitted to me by the author of the species. 

 It closely resembles P. costata, but which has thicker and closer 

 ribs. 



Philobrya Bernardi, sp. nov. Pi. iv., fig. lo. 



Shell rather thin, ventricose, contour obliquely subquadrangu- 

 lar ; umbones nearly terminal, prodissoconch large and prominent. 

 Anterior margin nearly straight, or slightly curved, making a 

 right angle with the hinge-line ; posterior margin rtraight, 

 ventral-margin well-arched. An obsolete keel defines a somewhat 

 steeply inclined post-umbonal slope; anterior to which the surface 

 is ornamented by about eight slender costse, which are crossed by 

 concentric threads of nearly equal calibre with the radial 

 threads, regularly disposed, but with increasing intervals towards 

 the ventral margin ; these concentric threads produce slight 

 serratures on the radial threads. 



Internally, the posterior margin is slightly interrupted by five 

 or six crenulations. The ligamental pit is short, lanceolate, 

 and directed backwards ; posterior to which the hinge- 

 line is obsoletel}? transversly ridged. A very deep byssal notch 

 terminates the almost obsolete anterior of the hinge-line. 



This new species is named in compliment to M. Felix Bernard,* 

 of the Natural History Museum at Paris, whose gift of 

 specimens of P. costata has largely assisted me in the elaboration 

 of the species herein dealt with. It is conspicuous among 

 congeners by open fenestrated ornament. 



Horizon. — Eocene, Victoria ; Muddy Creek (2 exs.), Shelford 

 (1 ex.), Curlewis (I ex.), collected by J. Dennant ; and Fyans- 

 ford (1 ex.), collected by J. F. Mulder. 



Philobpya prsenuntia, sp. nov. PI. iv., fig. 9. 



Shell rather thin, ventricose, inequilateral ; obliquely oval- 

 rhomboid in contour ; prodissoconch relatively very larsje and 

 prominent. 



The anterior margin is convex. The ornament consists of 

 about twelve slender radial costae, on which are formed slight 

 serratures by the very feeble concentric laminations which are 

 visible in the interradial spaces. 



The ligamental pit is shortly oval-lanceolate and directed 

 backwards ; the anterior portion of the hinge-line has about 

 fourteen transverse ridges, whilst the posterior portion is only 

 obsoletely ridged. 



* It is with profound regret that I announce this dedication to be 

 posthumous, as that talented young malacologist died August 12, 1898, at 

 the early age of thirty-five years. 



