Occasional Papers of the Museum of Zoology 75 



1915 FriErson, L. S., Lasmigona subviridis Conrad, redivivus 



(Nautilus, XXIX, 1915, pp. 57-59). 

 1915 Walker. B., Unio viridis Conrad (Nautilus, XXIX, 1915. 



pp. 74-78). 



1915 Vanatta, E. G., Rafinesque's Types of Unio (Proc. Acad. 

 Phila., 1915, pp. 549-559)- 



1916'' Frierson, L. S., Observations on the Unio cor of Conrad, 



(Nautilus, XXIX, 1916, pp. 102-104). 

 1916" Walker, B., Pleurobema lewisi (Lea) (Nautilus, XXIX, 



1916, pp. 114-116). 

 1916c Walker, B., The Rafinesque-Poulson Unios (Nautilus. 



XXX, 1916, pp. 43-47). 



1916 OrTmann, a. E., The Anatomy of Lemiox rimosus (Raf.) 

 (Nautilus, XXX, 1916, pp. 39-41). 



1916c Frierson, L. S., Observations on Unio giganteus Barnes 

 (Nautilus, XXX, 1916, pp. 61-64). 



1916 Utterback, W. I., The Naiades of Missouri (Amer. Mid- 

 land Nat., IV, 1916. pp. 1-200). 



1917 Frierson. L. S , New Genera and Species of Central Amer- 

 ican Naiades (Nautilus, XXXI, 1917, pp. 47-49). 



1918" Walker, B., Notes on North American Naiades (Occ. Pap. 

 Mus. Zool., Univ. Mich., XLIX, 1918 (March), pp. i-6)-. 



1918 Ortmann, a. E.. The Najades (Fresh-water Mussels) of 

 the Upper Tennessee Drainage, with notes on synonymy 

 and distribution (Proc. Amer. Phil. Soc, LVII, 1918 (Octo- 

 ber), pp. 521-626). 



1918c Walker, B., A Synopsis of the Classification of the Fresh- 

 water Mollusca of North America, North of Mexico, and 

 a Catalogue of the more recently described Species, with 

 notes (Univ. Mich. Mus. Misc. Publ., VI, 1918, pp. 1-213). 



1919 Frierson, L. S., Remarks upon the Identity of Unio fas- 

 ciata Rafinesque (Nautilus, XXXII, 1919, pp. 139-141). 



1919 Ortmann, A. E., A Monograph of the Naiades of Penn- 

 sylvania. Part 3, Systematic Acount of the Genera and 

 Species (Mem. Carnegie Mus., VIII, 1919, pp. 1-384). 



1920 Frierson, L. S., Lasmigona viridis Rafinesque (Nautilus, 

 XXXIII, 1920, pp. 127-130). 



1921 Ortmann, A. E., The Anatomy of Certain Mussels from 

 the Upper Tennessee (Nautilus, XXXIV, 1921, pp. 81-91). 



