222 RECORDS OF THE AUSTRALIAN MUSEL'Jl. 



TTT. PeLECYPODA from the PEUMo-CAni-.ONIFEROrS (»K 



Bun DA NOON. 



Genus Uiapliragniella,^- tjeii. nor. 



(Jen. Chars. — Shell elougately pterinifoi'iu, left valve convex ; 

 cardinal margin provided with liganieutal furrows, and a few 

 cardinal teeth, but no lateral lamellae ; clavicle oblique, incon- 

 spicuous ; adductor scar veiy small, but deep, high in position. 



Oh". — A remarkable form with the outward appearance of 

 an oblique Merismopteria, but with a small oblique clavicle in 

 front of the anterior adductor scar in the place of a strong one 

 at right angles to the cardinal margin. There is an excavate 

 liganieutal area as in Merismopteria, but no divej'ging lateral 

 lamellffi ; there are one or two cardinal teeth slightly anterior 

 to the umbos, which do not exist in MerisinopteriK, situated 

 above the highly placed anterior adductor, quite on a par 

 with the structure of Pterlnea, but again is to be noted the 

 absence of lateral dental lamellae. On the other hand, there 

 is a resemblance to Pterinea in the convexity of the left valve, 

 and were the test preserved, strong radiating costae. 



Diaphragmella merismopteroides, sj). nov. 



(Plate xl., figs. 1-2). 



Si)- Chars. — Shell (cast) elongately and obliquely pteriuiform; 

 cardinal margin less than the width of the shell ; ventral 

 margin well rounded ; anterior end proper very small and 

 lobe-1-ike, the margin strongly insinuate downwards; posterior 

 auriculation flattened. Umbonal region long, narrow, convex 

 and elevated, the umbo apparently slender and acute; cardinal 

 teeth very slightly in advance of the umbo. Anterior adductor 

 scar immediately under the cardinal margin, placed obliquely. 



Ohs. — This appears to be a remarkable modification of the 

 Merismopteria type, and might easily be mistaken for the 

 latter on casual observation. 



1- Diminutive of 6t'(/.(/)/)(/.y/i</, a piirtitiuu. 



1 



