oils 



112 Frederick Cliapmdii : 



Avho obtained it from Wilson's Quarry, near Lilydale. An extensive 

 series of the same fossil was collected and presented by the Rev. A. 

 W. Cresswell, M.A., who obtained these spirifers fi-oni vari 

 exposures to the iioith of Lilydale. Silurian (Yeiingian). 



EXPLANATION OF PLATES. 



Platk X. 



Fig. 1. — Siphoiiotreta plicateUn, sp. nov. : rt, pedicle valve (holo- 

 type), X 6; 6, profile of valve, x 6; o. ornament of 

 anterior part of valve, x US. Silurian (Melbour- 

 nian) : Yan Yean, Victoria. Coll. Mr. A. J. Shearsby, 

 F.R.M.S. 



Fig. 2. — Crania pulchelloide.s, sp. nov. a, apical aspect; h, profile. 

 Silurian (Yeringian) : Ruddock's Quarry, near Lily- 

 dale, Victoria. Coll. by Mr. W. J. Parr, x 4. 



Fig. 3. — Leptaeiia rhoinhoidalis, Wilckens sp. Cardinal area and 

 posteri(n- portion of shell, to show denticulated hinge- 

 line. Silurian (Yeringian) : Loyola, near Mansfield, 

 Victoria. Coll. by Mr. G. Sweet, F.G.S. x 2. 



Fig. 4.— Z. rhomhoidalis, Wilckens sp. Interior of a brachial or 

 dorsal valve in the neanic stage, sliowing impression 

 of the fleshy spiralia and crura. Silurian (Yeringian) : 

 Loyola, near Mansfield, Victoria. C^oU. by Mr. G. 

 Sweet, F.G.S. x 3. 



Fig. 0. — L. 7'ho/nhoidaiis, Wilckens sp. Wax squeeze fiom interior 

 of brachial valve (Fig. 4), showing form of spiralia. 

 X 3. 



Fig. 6. — L. r/io/tiho/dril/s, Wilckens sp. Natural cast in mudstone 

 of interioi- of brachial valve. Silurian (Yeringian) : 

 Loyola, near Mansfield. Coll. by Mr. G. Sweet. F.G.S. 

 X f?. 



Fig. 7. — L. rhoinhoidalis, Wilckens sp. Wax s(|ueeze from natural 

 impression of brachial valve (Fig. (5), sliowing brachial 

 impi'essions. x 3 



Fig. 8. — Chonefrs. hipartifa, sp. nov. Pedicle valve (cotype). Silu- 

 rian (Yeringian): K'uddock's (^Miarry, near Lilydale. 

 (^.11. by .Mr. J. S. Green. x 3. 



Fig. 9. — C. hipartitd, sp. nov. Pedicle valve of a larger examjde 

 (paratype). Silurian (Yeringian) : Simmonds' P.ridge 

 Hut on the Yarra. Coll. Geol. Surv. Vict. x 3. 



