518 
THE AMERICAN MIDLAND NATURALIST 
—— —— 
aid of Dr. A. E. Ortmann. Since the Meramec is in great danger 
of depopulation of its Naiades through ravages of pearl hunters. 
etc., it is thought worth while to publish the following list :— 
GOS Sy Gre Cat 
18. 
19. 
Family Unioniade (Swainson) 
Fusconaia undata trigona (Lea) 
Amblema (plicata) costata (Raf.) 
Megalonais heros (Say) 
Quadrula pustulosa schoolcraftensis (Lea) 
Quadrula verrucosa (Raf.) ' 
Quadrula metanevra (Raf.) v . 
Rotundaria tuberculata (Raf.) 
Pleurobema aesopus (Green). 
Pleurobema obliqguum plenum (Lea). 
Pleurobema obliquum pyramidatum (Lea) 
Elliptio nigra (Raf.) 
Elliptio dilatata (Raf.) 
Strophitus edentulus (Say) 
Obliquaria reflexa (Raf.) 
Nephronais ligamentina (Lane) 
Amygdalonais donaciformis (Lea) 
Amygdalonais truncata (Raf.) 
; Plagiola securis (Lea) 
‘Lampsilis anodontoides (Lea) 
Central High School, St. Louis, Mo. 
PARASITISM AMONG MISSOURI NAIADES.: 
BY W. I. UTTERBACK. 
This paper would consider only the subject of parasitism 
in the sense of the Naiades, or Fresh-water Mussels, as hosts and 
not as parasites. As well known among students of Narades 
nearly all the Species are parasitic in the glochidial, or larval, 
life on fish hosts, the two notable exceptions, so far known, being 
in case of Strophitus edentulus? and Lastena ohiensis, (= Anondota 
. Contribution, (in part), from U. S. Biological Station, Fairport, Lowa. 
Published by permission of the Commissioner of Fisheries. I 
2 George Lefevre and W. C. Curtis, U.S. Bu. Fish. Doc. No. 756, XXX, 
Dp. 17T-174.. 192, ; 
