THE CAINOZOIC CIDARIDAE OF AUSTRALIA. 
Fig. 26a, b. 4 Club-shaped Spines, incertae sedis / Waurn Ponds ; Reg. No. 
13724; Nat. Mus., pres. F.A.C. x2. 
Fig. 27. Goniocidans mortenseni, sp. nov. Spines; Aldinga, upper beds; 
6 Paratypes (Reg. No. 13721) ; Nat. Mus., pres. F.A.C. x2. 
Plate XV. 
Fig. 28a-c. Prionocidaris scoparia, sp. nov. a, thorn-bearing spine, ' tip 
imperfect ; b, thorn-bearing spine with flattened shaft ; c, a spine tip. 
All from Aldinga, lower beds; 3 Paratypes (Reg. No. 13710) ; Nat. 
Mus., pres. F.A.C. Nat. size. 
Fig. 29a, b. P. scoparia, sp. nov. a, complete spine with shorter thorns, 
showing tip ; Reg. No. 13711 ; Nat. Mus., pres. F.A.C. b, fragmentary 
flattened spine with similar ornament, showing tip ; Tate Coll. ; Para- 
types. Both from Aldinga, lower beds. Nat. size. 
Fig. 30. P. scoparia, sp. nov. Fragmentary spines to show ornament; 
Aldinga, lower beds ; 4 Paratypes (Reg." No. 13712) ; Nat. Mus., Sweet 
Coll. Nat. size. 
Fig. 31. Chondrocidaris clarkii, sp. nov. Spines; Morgan, lower beds; 6 
Paratypes (Reg. No. 13713) ; Nat. Mus., pres. F.A.C. Nat. size. 
Fig. 32a, b. Stereocidans australiae (Duncan), a, Spines, tips missing ; 
2 Plesiotypes (Reg. No. 13699). b, cup-shaped spine tips ; 4 Plesiotypes 
(Reg. No. 13700). All from Point Flinders, near Cape Otway; Nat. 
Mus., pres. F.A.C. Nat. size. 
Fig. 33. Phyllacanthus duncani, sp. nov. Spines, two showing peeling of 
outer ornament; Batesford ; 5 Paratypes (Reg. No. 13708); Nat. 
Mus., pres. F.A.C. Nat. size. 
Fig. 34. Stereocidaris australiae. Curved spine ; Aldinga, lower beds ; 
Plesiotype ; Tate Coll. Nat. size. 
Fig. 35. S. australiae. Spines, one showing colour bands ; Aldinga, lower 
beds; 7 Plesiotypes (Reg. No. 13702) ; Nat. Mus., pres. F.A.C. Nat. size. 
Fig. 36a-c. S. australiae. a and b, spines; 2 Plesiotypes (Reg. No. 13703). 
c, spine, with wing-like projections near the neck ; Plesiotype (Reg. 
No. 13704). All from Aldinga, lower beds ; Nat. Mus., pres. F.A.C. 
Nat. size. 1 
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