324 Frederick Chapman : Victorian Fossils, Part XXI I. 



crassifuha, but is not sufficiently well preserved for exact 

 identifitation. The matrix filling the orifice is stained 

 with an ochreous deposit. To the right there is a frag- 

 ment of a gill-plume which is like those seen in Fig. 12. 

 Silurian. Probably on Warrandyte anticline, near- 

 Scotchman's Creek, Mulgrave. R. A. Keble coll. 



Fig. 6. — Trachyd(rmu sp. A large sigmoidal appendage, resem- 

 bling in shape a note of interrogation. Silurian. N.W^ 

 of Keilor. A. James coll. 



Fig. 7. — Tracltyderma sp. A number of prostomial appendages^ 

 on a slab of Silurian mudstone. The arrow points to a 

 sharply bent fragment, from which the sketch showing- 

 eye-spots and appendices was obtained (Plate I., fig. 2.)> 

 N.W, of Keilor. A. James coll. 



Fig. 8. — Trachychrma crassitnha. Chapman. Some finely pectin- 

 ated gill-plumes on dense, blue Silurian (Melbournian)* 

 mudstone, associated with tubes of this species. South. 

 Yarra Sewerage Works. F. P. Spry coll. 19/3/1897. 



Fig. 9. — T. crassifiiha. A small sigmoidal appendage. In sandy^ 

 ochreous mudstone of a false-bedded character, probably- 

 denoting shore conditions. Silurian (Melbournian.) Do- 

 main Road Sewer. F. P. Spry coll. 



Fig. 10. — Trachydernia sp. A curved fragment of a well pre- 

 served appendage. Silurian. N.W. of Keilor. A. James- 

 coll. 



Fig. 11. — TracJiydtrma sp. A well preserved terminal fragment 

 from which Fig. 1 on plate I. was sketched. Silurian. 

 N.W\ of Keilor. A. James coll. 



Fig. 12. — Trfu'hydtrmn crassituba, Chapm. Two appendages back 

 t^ back, pointing to their probable paired habit in the* 

 living state. Fig. 3 of Plate I. was taken near the base- 

 of this specimen. Silurian (Melbournian.) Hawthorn 

 Main Drain, Melbourne. F. P. Spry coll. 1903. 



Fig. 13. — CormilifeR youncfi, sp. nov. Shell embedded in Lower 

 Ordovician slate. Moorabool River, near Meredith, N.W^ 

 of Geelong. J. H. Young coll. 



Fig. 14. — C yoinuji, sp. nov. A senile example, much crushed^ 

 Lower Ordovician. Moorabool River, near Meredith^ 

 N.W. of Geelong. J. H. Young coll. 

 All figures on this plate slightly over natural size. 



