A Study of the Parasites of the Unionidce. 403 



ber of infested males and females for each species did not 

 differ materially. The exceptions are as follows : 



Unio heterodon, 4 males, females. 



Anodonta suborbieulata, 18 males, 2 females. 



Plagiola securis, 5 males, females. 



Lampsilis parvus, males, 31 females. 



Lampsilis lsevissimus, 4 males, females. 



Lampsilis tenuissimus, 5 males, females. 



The disparity of the sexes in these few species has no 

 significance, however, in this connection, for in no case where 

 both sexes were liberally represented in the host species 

 could a different capacity for infestation be established for 

 the two sexes. The only seeming exception, in the case of 



previously in common use. The specific names remain the same, except that comu- 

 tus becomes reflexa, and plana is now considered a form of grandis. 



Quadrula multiplicata Unio multiplicatus 



tuberculata tuberculatus 



metanevra metanever 



lachrymosa lachrymosus 



asperrima asperrimus 



pustulata pustulatus 



granifera graniferus 



pustulosa pustulosus 



plicata plicatus 



trigona trigonus 



rubiginosa rubiginosus 



ebena ebe'nus 



Unio gibbosus gibbosus 



complanatus complauatus 



heterodon , heterodon 



Alasmodonta confragosa Margaritana confragosa 



complanata complanata 



rugosa rugosa 



marginata marginata 



undulata .....' nndulata 



tappaniana Unio tappanianus 



Strophitus edentulus Anodonta edentula 



Anodonta imbecilis imbecilis 



suborbieulata suborbieulata 



grandis plana 



corpulenta eorpulenta 



Obliquaria reflexa Unio cornutus 



Plagiola securis securis 



elegans elegans 



donaciformis donaciformis 



Lampsilis parvus parvus 



ellipsis ellipsis 



higginsii higginsii 



ligamentous ligamentous 



luteolus luteolus 



nasutus nasi it us 



anodontoides anodontoides 



rectus rectus 



ochraceus ochraceus 



ventricosus venlricosus 



alatus alatus 



lsevissimus lsevissimus 



gracilis gracilis 



tenuissimus tenuissimus 



