Victorian Fossils, Part VIII. 27 



EXPLANATION OF PLATES. 



VL 



Fig. 1. — Gregoriura spryi, sp. et gen. nov. Silurian. S. Yarra. 

 Nat. size. 

 J, 2. — Protaster brisingoides, Gregory. Negative cast in 

 sandstone of two examples. Silurian. Flemington. 

 Nat. size. 



VIL 



Fig. 1. — Sturtzura leptosomoides, sp. nov. Silurian. Fleniing- 

 ton (Moonee Ponds Creek). Type. x 1^. 

 „ 2. — S. leptosomoides, sp. nov. Silurian. Flemington. x 1^. 



VIIL 



Fig. 1. — Arm-structure (ventral aspect) in Gregoriura spryi, 

 gen. et sp. nov. Silurian. S. Yarra. x 8. 



,, 2. — Oral and arm-structure in Protaste brisingoiders, 

 Gregory. Silurian. Flemington. x 6. 



,, 3. — Oral and arm-structure in Gregoriura spryi, gen. et 

 sp. nov. : showing embracing ossicles in the oral 

 region. Silurian. S. Yarra. x 6. 



,, 4. — Arm-structure in Sturtzura leptosomoides, sp. nov. 

 Silurian. Flemington. x 10. 



„ 5. — Arm-structure in Sturtzura leptosoma, Salter sp., from 

 specimen in Nat. Mus. Coll. from the Lower Lud- 

 low Series of Leintwardine, Herefordshire 

 (Alfred Marston coll). x 10. 



EXPLANATION OF LETTERING. 



a, ambulacral ossicles : ad, adambulacral ossicles : c, ambulacral 

 canal; f, mouth-frame ; j, jaws ; p, podial aperture ; 

 s, syngnath ; s.p., spine-bearing plate ; t, teeth. 



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