Victorian Fossils, Fart X. Ill 



EXPLANATION OF PLATES. 



Plate XXVII. 



Fig. la,b. — Tube and cast of burrow of Trachyderma crassituba, 

 sp. no v.: la, upper portion showing the circular 

 contour of the burrow where vertical to the bedding; 

 lb, continuation of same burrow, less part of speci- 

 men at gap, showing, by section(.?) the compressed 

 outline where nearly horizontal with plane of bed- 

 ding. 16 is turned through 180 deg. to show the 

 burrow on the same plane as la, but which is in 

 reality on the relatively opposite face in regard to 

 la, the slab having been fractured through to the 

 underside of the specimen. Holotype. Silurian 

 (Melbournian). S. Yarra. Coll. by F. P. Spry. 

 Nat. size. 



Eig. 2. — 2\ crassituba, sp, nov., in hard dark grey niudstone. 

 Paratype. Silurian (Melbournian). Between Hoyte s 

 Paddock and Punt Road, South Yarra. Coll. by 

 R P. Spry. Nat. size. 



Fig. 3. — T. crassituba, sp. nov, A specimen showing the outer, 

 corrugated surface of the tube. Paratype. Silurian 

 (Melbournian). S. Yarra. Coll. l)y F. P. Spry. 

 Nat. size. 



Fig. 4. — Trachyderma cf. crass i tuba, sp. nov. Specimen oblique 

 to plane of bedding, showing cast only. Silurian 

 (Melbournian). S. Yarra ; between Hoyte's Paddock 

 and Punt Road. Coll. by F. P. Spry. Nat. size. 



Fig. 5. — Tracliydernia cf. squaf/iosa, PhilliiDs. Cast of burrow, 

 oblique to the bedding plane. Silurian (Yeringian), 

 Junction of Woori Yallock and Yarra. Coll. Geol. 

 Surv. Vict. B23. 

 N.B. — ^All figures on this plate of the natural size. j- = trans- 

 verse section. 



Plate XXV ill. 



Fig. 1. — Turrilepas ornatus, sp. nov. Holotype. Inner sur- 

 face of plate. Silurian (Melbournian). Yan Yea 

 Coll. bv A. J. Shearsby. x 6. 



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