BY C. HEDLEY. 497 



in Salamander Bay, Port Stephens. The specimen, which is 

 slightly smaller than the type, was, he tells me, dredged alive, 

 enclosed in a nodule of hard mud. This curious habit is like 

 that of Choristodon rubiginosum* 



Labiosa meridionalis, Tate. 



Raeta meridionalis, Tate, Trans. Roy. Soc. S. Aust., xi. 1889, 

 p. 61, pi. xi., f. 3. 



(Plate xxv., figs. 5, 6, 7, 8, 9.) 



This species has hitherto been known from a single valve found 

 on the beach of 'Aldinga Bay, South Australia.. This year I have 

 taken a whole shell containing part of the animal, and on another 

 occasion a broken valve on "Chinaman's Beach," Middle Harbour. 

 Prof. Tate, to whom one valve was submitted, kindly informs me 

 that there is no essential difference between it and the type of 

 meridionalis. My specimens are smaller, being 28 mm. in length 

 and 21 mm. in height. Being perfect, I have utilised my example 

 to draw the valves in apposition and other details not obtainable 

 from the single valve hitherto known. 



Though disagreeing by vermiculate sculpture, the species seems 

 to me nearer to the subgenus Raetella, Dall. than to any other 

 division of Labiosa. 



Mylitta gemmata, Tate. 



Dr. W. H. Dall has recently described! a South Australian 

 shell as Mylitta inasqualis, " immediately separable from any of 

 the other species of Mylitta by its form and inequilateral, feebly 

 sculptured valves." 



Since these are exactly the characters of the species described 

 by Prof. Tate as Pythina gemmata,\ it seems that Dall was not 

 aware of that diagnosis and has re-named the shell. 



* Vide P.Z.S. 1867, p. 942. 

 + The Nautilus, xii., Aug. 1898, p. 41. 

 + Proc. Phil. Soc. S. Aust., ii. 1878-9, p. 132, pi. v., f . 8. 

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