X2 THE NAUTILUS. 



typical pilaris. Glochidia have been observed from the earliest 

 to the latest date, so that the breeding season begins probably 

 very early in May, and lasts to about the middle of July 

 (tachytictic). 



In all three forms the anatomy is the same, that is to say, 

 that of the genus Fusconaia, and agrees essentially with that of 

 F. subrotunda (Lea). Also the placentae are of the same char- 

 acteristic subcylindrical (not compressed or lanceolate) shape. 

 Glochidia of the shape and size of those of F. subrotunda : sub- 

 elliptical, higher than long, L. 0.13, H. 0.15mm. 



In the upper Clinch form of bursa-pastoris, the orange color oj 

 the soft parts and red color of the placentae prevail, whitish 

 specimens being rare. The same is the case in Powell River, 

 at least in its upper parts. Farther down in the Powell (Clai- 

 borne Co., Tenn.), specimens with whitish soft parts outnumber 

 those with orange parts. In the lower Clinch, the specimens 

 (lesueuriana-type~) are nearly all whitish, and only a few with 

 orange color have been found. In French Broad and Holston 

 Rivers, in all three varieties, white soft parts and white pla- 

 centae are the rule all the way up to the forks of the Holston 

 and the Watauga River. Orange soft parts and red placentae 

 are extremely rare. I have only one specimen from Grainger 

 Co., Tenn. (lesueuriana-type), and one from Sullivan Co. (bursa- 

 pastoris-type'). 



FUSCONAIA CUNEOLUS (LEA), F. CUNEOLUS APPEESSA (LEA). 



(See: 1. c., pp. 530, 531.) 



Gravid females: May 16, '15; May 22, '14; May 25, '15; July 

 5, 7, 8, 13, '13. Glochidia in specimens collected July 7 and 

 8. Thus tachytictic, breeding from May to July. 



These two forms have the same anatomy, and belong to Fus- 

 conaia. They agree very well with the account given of F. 

 rubiginosa (Lea) (=flava Raf.). (See: Ann. Carnegie Mus. 8, 

 '12, p. 241.) Of nine specimens preserved, seven have a short 

 mantle connection between anal and supraanal, while in two 

 this is missing, but probably torn. 



All four gills are marsupial, but in young specimens, the 

 marsupial part of the inner gill is often restricted to the middle 



