THE NAUTILUS. 81 



point approximately f of the distance along the mantle edge 

 from the anterior end, where the edge is produced into a tri- 

 angular process, directed somewhat anteriorly, and which is in 

 the line with the anterior edge of the post-adductor muscle. 

 Above, this process is spotted wtth a medium brown color, and 

 its edge is produced into papillae which become finer towards 

 the coarser ones of the branchial and anal regions. Below, the 

 coloration appears confined to a strip widest near the vertex 

 of the process described, and is succeeded posteriorly by the 

 papillae previously mentioned. 

 WASHINGTON AND JEFFERSON COLLEGE, WASHINGTON, PA. 



THE ANATOMY OF CERTAIN MUSSELS FROM THE UPPER TENNESSEE. 



RY A. E. ORTMANN, PH. D. 



In the Proc. Americ. Philos. Soc. 57, 1918, pp. 521-526, the 

 present writer has published a Synopsis of the Naiades, or fresh- 

 water mussels of the upper Tennessee drainage, assigning each 

 species its proper place in the system. But in some of them 

 the observations on the anatomy forming the basis for the tax- 

 onomic arrangement have not been given. It is the purpose of 

 the present paper to furnish these data, together with additional 

 remarks on species treated previously. 



I am sorry that I am compelled to introduce again nomen- 

 clatorial changes without fully supporting them; but this will 

 be done in another paper. 



FUSCONAIA PILARIS (LEA), F. PILARIS LESUEURIANA (LEA), F. 



PILARIS BURSA-PASTORIS (WRIGHT). (See Ortmann, 1. c. , 

 pp. 527-529.) 



Anatomy: F. bursa-pastoris (Wr.} in NAUTIL. 27, 1918, p. 90 

 (incomplete, no gravid females at hand). 



Gravid females have been found subsequently on the follow- 

 ing dates: May 11, 13, 14, '13; May 20, 22, 23, '14; July 7, 8, 

 13, '13. They belong in part to the var. bursa-pastoris, in part 

 to the var. lesueuriana, but none have been found belonging to 



