Older Tertiary of Victoria. 97' 



Muddy Ci-eek, near tlie 8tate School, Western Victoria. 

 Kalimnan, — Miocene. 



Observatio7is. — As I have previously indicated/ this species was- 

 regarded by Professor Tate as C. oblonga, T. Woods, but that 

 conclusion I could not agree with when dealing with a collection 

 of Table Cape fossils. Since then I have been able to examine 

 the type of T. Woods' species in the Hobart Museum, and to 

 collect a large .series of specimens from the type locality, and I 

 think there can be very little doubt about the utility of regarding 

 our Victorian form as a distinct species. C. camurus may be 

 distinguished from C oblonga by its different outline, more 

 striking umbo, by not being so generally depressed, and not so 

 flattened at the crest of the incurvature of the beak, being more 

 attenuate posteriorly, and by possessing a more coarsely corrug- 

 ated beak ; there are 8 to 10 corrugations in the first 4 millimetres 

 in tlie former, as against at least 15 in the latter. 



Mytilicardia kalimnae, sp. nov. (Plate XII., Fig. 4). 



Description. — Shell thin, almost elliptical in outline, and rather 

 depressed, so that from the internal aspect it appears shallow,, 

 externally strongly radiately ribbed, the ribs bearing erect scales. 

 Faintly concave anterior to the beak, showing an extremely 

 narrow but elongated lunule, anterior end convexly rounded and 

 well-developed, post-dorsal margin ascends only a little, thence to- 

 the extreme posterior, convexly curved rather than truncated, 

 and from the extreme posterior to the ventral margin more 

 sharply curved, the greater part of the margin undulatory on 

 account of the protrusion of the radial ribs. 



Surface bearing 19 radiate ribs, with deep interspaces of about 

 the same Avidth; the ribs on the posterior slope are furnished 

 with distant (that is from 1.5 to 2 mm. apart) erect hollow scales 

 or spines, while on the anterior of the shell the scales are packed 

 much more closely, and appear rather as a granulation or irregular 

 oblong beading; ribs also radiately striate, and both interspaces 

 and ribs transversely crossed by lines of growth. Internally 

 .strongly denticulate, and owing to the thinness of the shell it is 

 internally grooved, corresponding to the external ribbing. 



1 P.R.S. Vic, vol. viii., ii.s., p. 131. 



