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 fascicles 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 f. 



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. I. Caryophyllia viola : a, front view, natural size ; 6, magnified 4 dia- 

 meters; c, costse magnified 6 diam.; d, septa, pali, and papillary 

 columella, magnified 4 diam. 



Fig. 2. Flabellum Victories : a, front view, natural size ; b, calice, magnified 

 2 diam. ; c, erosion, magnified 2 diam. ; d, costal arrangement, 

 magnified 4 diam. 



Fig. 3. Flabellum Gambierense : a, front view ; b, calice, magnified 2 

 diam. ; c, epitheca, and d, enlarged ends of septa, magnified 

 4 diam. 



Hg. 4. Placotrochus elongatus : a, front view, natural size ; b, the same 

 of another specimen ; c, 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 ; b, columella, magnified 

 4 diam. ; c, variety Bur sarins, front view. 



Plate VL 



Fig. 1. Balanophyllia Australiensis : a, front view, natural size; b, part 

 of a coral, natural size ; c, septa, magnified 4 diam. ; d, costae, 

 magnified 4 diam. 



F^g. 2. Trochoseris Woodsi : a, corallum, natural size ; b, septa in calice, 

 magnified 2 diam. ; c, septa, magnified to show synapticulse. 



Fig. 3. Hemipatagus Forbesi : a, upper view ; b, side view ; c, posterior 

 view ; d, under side (all natural size) ; e, apicial summit, genera- 

 tive pores, /, pores and ambulacral tubercles, g, large tubercles, 

 magnified 4 diam. 



* Synopsis des Echinides, p. 416. 



t Since the completion of this paper, I have received Karl A. Littel's 

 'Fossile MoUusken und Echinodermen aus Neu-Seeland.' The Hemipa- 

 tagus tuberculatus therein described, and decided to be specifically distinct 

 from H. Forbesi, is very closely allied. 



