168 Dr. P.M. Duncan on Fossil Corals and Echinoderms. 
Hemipatagus Forbesi appears to be a common fossil in the 
South-Australian Tertiaries. The genus is separated from Spa- 
tangus by Desor*, on account of the defective fascioles and of 
the absence of large tubercles in the posterior interambulacral 
area. The European species are found in Eocene and Miocene 
strata, and H. Hoffmanni, the nearest alliance of the new form, 
is from Malta and Biinde. The species from the Java Tertiaries 
are not closely allied to the Australian +. 
The flat Clypeaster, which is also a common fossil, so closely 
resembles C. folium of the Maltese bed (No. 2) as to merit the 
title of a variety ; and this opinion is not weakened by the exist- 
ence of a Schizaster in the Adelaide Tertiaries, which (although 
defective specimens alone are in my possession) is not distin- 
guishable from S. Parkinsoni, Defrance, of Malta. 
EXPLANATION OF THE PLATES. 
PLATE V. 
Fig. 1. Caryophyllia viola: a, front view, natural size; 6, magnified 4 dia- 
meters ; c, costee magnified 6 diam.; d, septa, pali, and papillary 
columella, magnified 4 diam. 
Fig. 2. Flabellum Victorie : a, front view, natural size; b, calice, magnified 
2 diam.; ¢, erosion, magnified 2 diam.; d, costal arrangement, 
magnified 4 diam. 
Fig. 3. Flabellum Gambierense: a, front view; 5, calice, magnified 2 
diam.; c, epitheca, and d, enlarged ends of septa, magnified 
4 diam. 
Fig. 4. Placotrochus elongatus: a, front view, natural size; 6, the same 
of another specimen ; ¢, side view, part of coral removed to show 
the columella; d, calice, and e, columella, magnified 4 diam. 
Fig. 5, Placotrochus deltoideus: a, front view; 6, columella, magnified 
4 diam.; c, variety Bursarius, front view. 
Puate VI. 
Fig. 1. Balanophyllia Australiensis: a, front view, natural size; 6, part 
of a coral, natural size; c, septa, magnified 4 diam.; d, coste, 
magnified 4 diam. 
Fig. 2. Trochoseris Woodsi: a, corallum, natural size; 5, septa in calice, 
magnified 2 diam.; c, septa, magnified to show synapticulz. 
Fig. 3. Hemipatagus Forbesi: a, upper view; 6, side view; ¢, posterior 
view; d, under side (all natural size); e, apicial summit, genera- 
tive pores, f, pores and ambulacral tubercles, g, large tubercles, 
magnified 4 diam. 
* Synopsis des Echinides, p. 416. 
+ Since the completion of this paper, I have received Karl A. Littel’s 
‘Fossile Mollusken und Echinodermen aus Neu-Seeland.? The Hemipa- 
tagus tuberculatus therein described, and decided to be specifically distinct 
from H. Forbesi, is very closely allied. 
