72 Proceedings of the Royal Society of Victoria. 



more especially in the brachial valve, the margin of which 

 appears to curl round to enclose the edge of the narrower ventral 

 valve. Marginal area of valves crenelate. Surface of valves 

 marked by strong fasciculate radii, about nine in the space of 10 

 mm. in the central area, these in turn being further subdivided 

 at 5 mm. from the anterior margin ; also with transverse, concen- 

 tric lines which break, to some extent, the continuity of the 

 radii. Muscular areas of both dorsal and ventral valves well- 

 marked and bordered prominently ; those of the dorsal elevated 

 and divided by a central ridge. 



Measurements. 



Dorsal valve of a large specimen, length 



width - 

 depth about 



A ventral valve - - - length 



width- 



Affitiities. — The nearest allied form to the above is undoubtedly 

 Strophonella euglypha, Hisinger sp.,^ both in shape, structure, 

 and general markings. The chief differences are, the compara- 

 tive flatness of the ventral valve and the striking genicidation of 

 the dorsal valve and also the larger number of radii in S. eugly- 

 phoides. The European species is proportionately longer than 

 the present one, and the concentric undulations on the shell 

 surface more numerous. The muscular areas of the dorsal valve 

 are shoi-ter and deeper in S. euglyphoides. 



Occurrence. — North of Lilydale ; in a hard ochreous mudstone. 

 Presented by Rev. A. W. Cresswell, M.A. [688-701]. Also Geol. 

 Surv. Victoria, Parish of Yering, sect. 12 [678-81]. 



Horizon. — Silurian (Yeringian). 



Genus Plectambonites., Pander. 



Plectambonites transversal is, Wahlenberg sp. 



Anomites transversalis, Wahl., 1821, Acta Upsal., vol. viii., 

 p. 64, No. 4. Leptaena transversalis, Wahl. sp., Dalman, 1828, 



1 Leptaena euglypha, Hisinger, 1819, Antecken, pi. vi., fig. 4. .Strophomena euglypha, 

 His. sp., Davidson, 1871, Brit. Silurian Brachiopoda, No. iv. (Pal. Soc. Men.), p. 288, pi. 

 xl., figs. 1-5. Strophonella euglypha. His. sp.. Hall and Clarke, 1892, Pal. N.Y., Palaeozoic 

 Brachiopoda, pt. i., pp. 279, 292. 



