23 



Peronea variegana, Schiff. 9-3 



W. Mansbridge. 



Sacculus broad, widely emarginate, edge rugose. Socii 

 broad. Cornuti one rose thorn, eight to nine Blender spines. 



Ostium and operculum minutely spined; lobes wide, 

 rounded. Signura Bcobinate. 



Peronea lissurana. Pierce and Metcalfe. 



J. W. M. 2—2 



Sacculus slightly arched. /Edooagus with strong branched 



spine before the orifice; cornuti one long, slender spine. 



Ostium lobes sbort, tapered, pointed: ductus bursts 

 clothed with small black nodules. Signum stellate. 



Peronea reticulata, Strom. J. W. M. 2—1 



Sacculus broad, emarginate before half, afterwards rounded 

 to anal angle, which is pointed. Socii narrow. .Edocagus 

 geniculate. Cornuti three to five. 



Ostium orifice minutely spined, lobes short, pointed, 

 angular. Signum ovate, spined. 



Peronea lorquiniana, Dup. J. W M. 1—1 



The development here suggests a further removal from the 

 genus 



Sacculus broad, projecting lobe at half; afterwards 

 emarginate. Socii specialised, long, erect, clothed with 

 spines. Anal tube with narrow neck. Cornuti four spines. 



Ostium naked, simple, operculum minutely spined; 

 lobes curved, sharply pointed. Signum small, scobinate. 



Genus 6. Rhacodia, Eb. type emargana, Fab. 



Rhacodia emargana, Fab. 1—1 



A development of Pcroncidii. 



Valva trigonate; costa thickened; valvula pointed. 

 Sacculus extends upwards to and beyond the costa, then 

 maked a complete hook, terminating in a head of spines. 

 Uncus indent. Anal tube highly chitinised. Socii erecl 



