AUSTRALIAN CAINOZOIC (TERTIARY) DEPOSITS. 51 



outer are oval in outline ; some are faintly conjugate, and others 

 not so : the extension of the outer rows of pores beyond the petals 

 and towards the ambitus is scanty. The anal furrow reaches nearly 

 to the vertex ; and the opening is triangular in outline, the upper 

 angle being slightly rounded, whilst the base is below the level 

 of the ambitus, with which it does not interfere. The ambitus is 

 rounded, and the actinal surface is concave from side to side, and 

 from before backwards, the slope being towards the actinosome, 

 which is small, eccentric in front, transverse and elliptical in out- 

 line, the posterior lip being rather straight and on a level with the 

 anterior. The floscelles are small. The tuberculation is small 

 everywhere, and smallest in the anal groove. 



Height of specimen -^ inch, length |-J inch, breadth T ^- inch. 



Locality. — jSFo. 5, Upper Coralline Beds, Cape Otway. 



Ptgorhtnchtjs Yassali, Wright. 



A very perfect small specimen was found east of the Glenelg 

 river, in a matrix of white limestone crowded with Polyzoa. It 

 resembles in its shape and details that figured by Dr. Wright, 

 F.G.S., &c. in Quart. Journ. Geol. Soc. vol. xx. pi. xxii. fig. 6 ; 

 and he considers the Maltese form there delineated to belong to the 

 genus Pygorhynclms. In the Australian and also in the Maltese 

 specimen the periproct is longitudinal, and there is no floscelle; 

 so that both are sufficiently anomalous members of the genus. 

 Some remarks on the species and its allies are made further on. 



Locality.' — East of the Glenelg river. 



Catoptgus elegans, Laube, op. cit. fig. 7, and p. 190. 



This species has a pentagonal peristome, a well-developed flos- 

 celle, and a kind of plastron. It is concave inferiorly, and this is 

 rather anomalous. 



Locality. — The Banks of the Murray. : 



Family SPATANGIM]. 



Holaster Australia, sp. nov. Plate III. figs. 12 & 13. 



The test is ovoid in outline when seen from above, and is slightly 

 grooved in front, and pointed and truncated posteriorly. It is 

 rounded at the ambitus and over the apical part ; but owing to there 

 being a keel between the actinosome and the posterior end, the 

 greatest height is behind the apical system. The test is thick, and 

 only marked above by one depression, for the anterior odd ambula- 

 crum. The apical system (PL III. fig. 13) is long and central, the 

 antero-lateral ambulacra being widely separate, flush with the test, 

 long and open, and widely separated from the posterior ambulacra. 

 The generative pores are four in number, and the posterior pair 

 are separated from the anterior by the ocular plates of the antero- 

 lateral ambulacra; on the other hand the ocular plates of the pos- 

 terior ambulacra are posterior to those pierced by the posterior 



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