io6 bulletin of the bureau of fisheries. 
P. donacifornm: “Mississippi drainage generally; Alabama River area; southwest 
to the Trinity River, Tex.; Michigan.” 
In artificial infections this fish takes readily almost any glochidia of the Lampsilis 
group, but with indifferent results, more probably due to the difficulty of handling it in 
hot weather than from any other cause. 
Shovel-nose Sturgeon (Scaphirhynchus platorhynchus) . 
Sturgeons as a rule are bottom feeders, and this species is no exception, so that we 
should expect to find it very frequently infected. Such, however, does not seem to be 
the case. The heavy gill filaments of this fish render difficult the detection of glochidia; 
therefore all that were obtainable were carefully gone over, and it is not believed any 
were overlooked which were carrying larvae in any numbers. On October 15 and again 
on November 7 specimens were taken holding larvae of Lampsilis fallaciosa, and these 
were in sufficient numbers to indicate that it is the specific host of this particular species. 
While it is unsafe probably to consider this fish the only distributor of fallaciosa, 
it is interesting to note the known geographical ranges of the two species, which is as 
follows : 
S. platorhynchus: “Mississippi Valley and streams of the Western and Southern 
States” (Jordan & Evermann). 
L. fallaciosa: “Upper Mississippi drainage; south to the Cumberland River, Tennes- 
see, and to Arkansas; Red River of the North?” (Simpson). 
MUSSELS AS PARASITES. 
We shall now consider the matter from another point of view, taking up in their 
order the various mussel species as parasites. It will be noted that all species considered 
in this study are gill parasites with one exception, A. corpulenta, and consequently nearly 
all of commercial value. 
Slop-Bucket (Anodonta corpulenta). 
But one fish has been taken bearing larvae on the external parts, and this is found 
to be corpulenta. On November 10, 1910, along the river shore within the grounds of 
the biological station, a young skipjack about 3 inches in length was picked up which 
held 24 glochidia, mostly on the caudal fin, but a few on ventrals and pectorals. By 
reference to the accompanying figure (fig. i , pi. xxix) it will be noted that encystment 
is incomplete, though but a small portion of the dorsal edge of the shell protrudes, and 
that the infection is quite recent is further shown by the condition of development in the 
adductor muscle. This glochidium is saddled over the edge of the caudal fin and grasps 
two of the cartilaginous rays up almost to the adductor muscle; the other glochidia 
occupied relatively the same positions on the fins as shown in this figure. 
