New Echinoids from Australian Tertiari/. 53 



grooves. Between the posteriof petals it is almost straight. The 

 lateral fascicle leaves the peripetalous at about one-third of the 

 length of the anterior lateral petal from its outer end, and keeps 

 well on the dorsal surface till opposite the outer end of the 

 posterior petal, when it bends downward to pass under the 

 periproct at a distance below it equal to the length of the 

 posterior petal. There are four perforated basals. 



Measurements. 



1 Tate's type ; 2 his smaller specimen ; 3 the author's specimen. All from Murray 

 River cliffs at Morgan. No. 3 is the fijfured specimen. 



I have specimens of what I believe to be this species from 

 Table Cape and Spring Creek, but both ai'e somewhat crushed. 

 Mr. J. Dennant also has the species from Table Cape. 



EXPLANATION OF PLATES XII [.-XVI. 



Figures 1, 2. — Echinoneus dennanti, n.sp. Slightly obliquely 



crushed. 

 „ 3, 4. — Prenaster aldingensis, n. sp. Outline sketches 



showing fascicles. A., apical system. Ps., 



peristome. Pr., Periproct. 

 „ 5, 6. — Brissopsis tatei, n. sp. 



,, 7, 8, 12. — Schizaster sphenoides, n. sp. Slightly distorted. 

 ,, 9, 10, 11. — Schizaster abductus, Tate. 

 All the figures are about natural size. 



