44 



RECORDS OF THE AUSTRALIAN MUSEUM. 



septum. From the two side grooves branches descend and con- 

 verge to produce the crura ; again descending and broadening, 

 they unite on the one side to the septum and on the other 

 form a recurved dorsal margin to the loop wings (fig. Qa). From the 

 septum the brachial process arises directly. It does not here 

 develope into the ordinaiy loop, but assumes the aspect of a 



Fi?. 6. 

 Campages fiircifera. 



hood with large outstretched wings, narrowing posteriorly into a 

 funnel with an open neck. Under the hood the base of each 

 loop wing is pierced by a small rent. This structure seems to 

 represent in adolesence that which elsewhere appears as a phase 

 of early life. 



Length — 24 mm. ; breadth, 17 mm. 



A single specimen attached to a stone. 



Hemithyris colurnus, sjj. nov. 

 (Figs. 7-8). 

 Shell shallow, triangular-cordate, smooth except for faint 

 o-rowth lines, glossy, translucent though solid, pale horn colour. 



Edges of valves broad and 

 bevelled. 



The brachial valve has 

 the beak incurved. Crural 

 plates separate to the umbo, 

 projecting, forked distally, 

 furrowed along the upper 

 surface. Teeth sockets 

 sharply transversely gro- 

 oved. There is no septum, 

 but in old and thickened 

 individuals a bilobed shelly 

 mass appeal's in its place. 

 The pedicle valve has the 

 The small oval foramen completed by the 

 Teeth strong projecting. Tn front the central 



Ficr. 7. 

 HemitJij/ris coin runs. 



beak pi-oduced. 

 deltidial plates. 



