71 
.80 that further investigation may not unlikely prove them 
di M is endeavouring to obtain some 
Family MOPALIIDAE, Pilsbry. 
è KOPIONELLA, n. gen. 
Differs from Plaxiphora, Gray— 
(1) In having peculiar oar-headed girdle bristles or 
spicules. 
(2) In having an elevated, recurved tail valve with 
terminal mucro. 
(3) The minor differences detailed hereunder. 
Differs from Frembleyana, H. Ad. 
(1) In having peculiar oar-headed bristles or spicules. 
(2) In the slits in the median valves being centrally 
situated and sinus, especially in tail valve, being 
much narrower. 
(3) The minor characters detailed below. 
l'ype.—Plaziphora matthewsi, Iredale. imen 
described herein is being presented to the South Australian 
Museum 
Description and comparisons of further di 
Purposes of this comparison Plaxiphora albida is used as 
typical of the genus Plaxiphora. In P. matthewsi, Ire., the 
Upper side of the tail valve is very distinct from P. albi. 
fferences. —For 
ida i 
