Tertiary. | PALMHONTOLOGY OF VICTORIA. { Echinodermata. 
but of small size in similar beds, Upper Miocene limestone beds 
from mouth of Curdie’s Inlet (A 11); also in similar beds at Bird 
Rock Point, 3 mile west from mouth of Spring or Tait’s Creek, 
parish of Jan Juc, 15 miles 8. from Geelong; lower beds of 
Miocene (A* 23); and §. of mouth of Spring Creek (A* 20); 
and at Bird Rock Point, middle beds of Miocene (A* 24), A‘ 28 ; 
Waurn Ponds quarries, near Geelong, and also from Miocene 
beds of beach at outer Geelong Harbor (A‘ 12). 
EXPLANATION OF FIGURES. 
Plate LX.—Fig. 1, specimen, viewed from below, to show the peculiar arrangement of the 
tuberculation ; natural size. Fig. 1", same view magnified, to show the details of the tubercu- 
lation and the sub-anal fasciole. Fig. 1, same specimen, viewed in profile. Fig. 1°, same speci- 
men, viewed from posterior end, natural size. Fig. 2, average specimen of typical variety, 
natural size, viewed from aboye. Fig. 2°, same view magnified, to show the details of the tuber- 
culation, the ambulacra, the four genital pores, the posterior madreporiform tubercle, and the 
internat fasciole. Fig. 3, primary tubercles of under side, to show the eccentric junction with 
the margin, magnified. Fig. 3°, primary tubercles of upper side, magnified. Fig. 4, elongate 
variety with more numerous primary tubercles on posterior lateral interambulacra, natural size. 
Fig. 4*, same specimen, viewed from above. 
Puatse LX., Fies. 5-7. 
MONOSTYCHIA AUSTRALIS (Lavse). 
[Genus MONOSTYCHIA (Lauper). (Sub-kingd. Radiata, Class Echinodermata. Order 
Echinida. Fam. Scutellidz.) 
Gen. Char.—Testa flat or slightly concave below, subpentagonal, rounded, slightly longer 
than wide ; edge thin, deeply indented at the ends of the ambulacral furrows. and slightly 
indented in middle of posterior margin ; apex a little in front of the centre, slightly raised 
conoidally; profile nearly straight to hinder edge, slightly convex to the front; genital pores four, 
the hinder larger and farther apart than the anterior pair ; ocular pores very minute ; ambulacral 
petals wide open at ends, the pores of each pair widely separated in the middle, connected by 
oblique sharp sulci; the pores of the inner row of each ambulacral zone smaller and rounder 
than the slit-shaped outer ones; the outer line of pores of each half ambulacrum more arched 
than the straighter inner row, the acutely angular interporiferous space nearly twice as wide as 
the poriferous zone; mouth rounded or subpentagonal, central; five deep narrow ambulacral 
furrows extend from the mouth to the margin, the three anterior nearly straight, the posterior 
lateral pair slightly arched outwards and forwards, extending with similar directions on the 
upper side through the centre of the ambulacra nearly to the apex; anal opening on under side, 
near the sinus in posterior margin, a slight prominence extending from it to the mouth; 
internal supports from mouth to margin, except in place of intestine, very numerous, and 
variable in size and shape; whole surface covered with minute close rounded tubercles, the 
narrow ridges between which are simple above and granular below. Differs from Scutel/a in 
its simple unbranched ambulacral furrows from mouth; differs from Arachnoides in being longer 
than wide and having the anal opening on the under side. ] 
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