244 ANNALS OF THE CARNEGIE MUSEUM. 
Fusconaja lananensis (Frierson). 
Frierson (1901, p. 76) describes the soft parts as: ‘‘salmon-colored, 
scarlet when cut’’ (probably sexual glands). ‘‘Eggs carried in all 
four gills, very red.’”’ This, together with the general shape of the 
shell, renders it almost certain that this species should be placed here. 
Fusconaja subrotunda (Lea). 
I have investigated numerous individuals in all conditions collected 
by myself in the Ohio and Allegheny Rivers in western Pennsylvania, 
and some additional ones from the Ohio between Pittsburgh and 
Cincinnati. 
The breeding season falls in June and July. 
The soft parts have been described by Lea (Obs., X, 1863, p. 427). 
This species agrees well with F. rubiginosa, but special mention 
should be made of the anal opening, which has fine crenulations, and 
shows the same variability as regards the short mantle-connection 
separating it from the supra-anal. The structure of the gills (see 
Ortmann, 1911}, pl. 86, figs. 1-3) is essentially the same as in F. 
rubiginosa. 
The ova are generally red, but in rare instances they are pale pink 
or white. The placente are also subcylindrical, and are discharged 
whole. The glochidia are similar to those of F. rubiginosa, but slightly 
higher than long.. Length 0.13 mm.; height 0.15 mm. 
In the color of the soft parts, two types may be distinguished. 
Normally there is much orange color present, which is most intense 
(deep orange-red) on the foot, the mantle margins, and the adductors, 
while the rest, chiefly the gills, are more brownish. When charged 
the gills are red. In the other type of color all parts are whitish or 
*yellowish, or brownish-white, the latter color chiefly on those parts, 
which are orange in the other type. Yet there are intergrades between 
these two types, the orange color gradually passing into the brown. 
In western Pennsylvania, the orange type prevails. There is no re- 
lation of these colors to sex. 
The color of the gonads deserves special mention in this species for 
comparison with the next. Inallspecimens examined it is either whitish 
or paler or deeper red, the latter of a distinct crimson hue, identical 
with the color of the eggs, but generally more intense. This crimson 
is found both in the male and in the female, so that it seems that also 
the sperm is thus colored. 
