from the South- Australian Tertiaries. 165 



are delicate, straight, and well marked laterally by the synaptic 

 culae. The columella is small. 



Height jL inch ; breadth of calice -^ inch. 



Locality. Muddy Creek, South Australia. 



BRYOZOON. 



9. Cellepora Gambierensis, Busk. 

 Locality. Muddy Creek, South Australia. 



ECHINODBRMATA. 



10. Hemipatagus Forbesi, Woods & Duncan. PI. VI. fig. 3. 



Spatangus Forbesi, Woods. 



Hemipataffus Hoffmanni, Goldf. ip. (Sturt). 



This common Echinoderm has been confounded both with the 

 Hemipataffus Hoffmanni, Goldf., of Biinde, and with the Hemi- 

 pataffus Griynoniensis, Agass., whose synonym, i^patangusOmalii, 

 Galeotti, will be recognized as denoting a form described by 

 E. Forbes in the Belgian Eocene. The Rev. J.Woods has called 

 it Spatanffus Forbesi ; but I cannot find any description of it, 

 although it is figured (p. 75, * South Australia,' Woods). The 

 species is clearly not //. Hoffmanni, and Start's mistake was cor- 

 rected by Mr. Woods. Mr. Woods having figured the species, 

 I append his name with my own. 



Test depressed, rather cordiform, nearly as broad as long,rounded 

 and sulcated in front, rather angular laterally and truncated pos- 

 teriorly. It is highest posteriorly, where it is roof-shaped; and it 

 slopes gradually anteriorly. The ambulacral summit is nearly cen- 

 tral. Interiorly the test is slightly concave and irregular; the 

 plastron is smoother than the rest ; the peristome is transverse, 

 semilunar, and there is a prominent posterior lip. The anterior 

 sulcus is broad, shallow, and rounded. The ambulacral areas are 

 lanceolate, the anterior being wide apart. The poriferous zones 

 are sunken and broad ; the pores are conjugate ; the interpori- 

 ferous zones are slightly raised, and are faintly tuberculated. 

 There are four generative pores, the anterior pair being closer 

 than the posterior. There are no large tubercles in the posterior 

 interambulacral space or in the posterior third of the central 

 space ; they are large and few in the rest of the interambulacral 

 spaces. The very small tubercles of the posterior space are very 

 crowded. The large tubercles which are seen inferiorly also are 

 nearly cylindrical, perforate, but not crenulate ; the scrobicula 

 is deep, and the tubercles are often in contact with one part of 

 the scrobicular circle. 



Height of specimens ^ inch, length 1 inch. 



Locality. The Murray, Mount Gambier, South Australia. 

 Coll. Geol. Soc. 



