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Explanation of Plates. 
Plate XII. 
Fig. 1. Stereocidaris austr aliae (Duncan). Actinal view of plesiotype ; 
Aldinga, lower beds. Tate Coll. Nat. size. 
Fig. 2. SL australiae. Abactinal view of same specimen, showing apical 
system. Nat. size. 
Fig. 3. S. australiae. Large iamb zone ; Aldinga, lower beds ; Plesiotype ; 
Tate Coll. Nat. size. 
Fig. 4. S. australiae. Iamb zone with nine perforate mamelons in an iamb 
row ; Aldinga, lower beds ; Plesiotype (Reg. No. 13698) ; Nat. Mus., 
Dennant Coll. Nat. size. 
Fig- 5- S. australiae. Abactinal portion of iamb zone ; Castle Cove ; Plesio- 
type (Reg. No. 13697). Nat. Mus., coll. T. S. Hall, pres. F.A.C. Nat. 
size. 
Fig. 6 a, b. S. australiae. a, actinal portion of iamb zone. Plesiotype (Reg. 
No. 13725) ; Nat. Mus., pres. F.A.C. b, iamb zone ; Plesiotype (Reg. 
No. 13701) ; Nat. Mus., coll. T. S. Hall, pres. F.A.C. Both from Castle 
Cove. Nat. size. 
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