Occasional Papers of the Museum of Zoology a5 
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Frierson, L. §., Lasmigona subviridis Conrad, redivivus 
(Nautilus, X XIX, 1915, pp. 57-59). 
WALKER, B., Unio viridis Conrad (Nautilus, X XIX, 1og15, 
pp. 74-78). 
Vanatta, E. G., Rafinesque’s Types of Unio (Proc. Acad. 
Phila., 1915, pp. 549-559). 
Frierson, L. S., Observations on the Unio cor of Conrad, 
(Nautilus, XXIX, 1916, pp. 102-104). 
WALKER, B., Pleurobema lewisi (Lea) (Nautilus, X XIX, 
1916, pp. I14-116). 
Wa ker, B., The Rafinesque-Poulson Unios (Nautilus, 
XXX, 1916, pp. 43-47). 
OrTMANN, A. E., The Anatomy of Lemiox rimosus (Raf.) 
(Nautilus, XXX, 1916, pp. 39-41). 
Frierson, L. S., Observations on Unio giganteus Barnes 
(Nautilus, XXX, 1916, pp. 61-64). 
Urrersack, W. I., The Naiades of Missouri (Amer. Mid- 
land Nat., IV, 1916, pp. 1-200). 
Frierson, L. S., New Genera and Species of Central Amer- 
ican Naiades (Nautilus, XXXI, 1917, pp. 47-49). 
WALKER, B., Notes on North American Naiades (Occ. Pap. 
Mus. Zool., Univ. Mich., XLIX, 1918 (March), pp. 1-6). 
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). 
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). 
Frierson, L. S., Remarks upon the Identity of Unio fas- 
ciata Rafinesque (Nautilus, XXXII, 1919, pp. 139-141). 
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). 
Frierson, L. S., Lasmigona viridis Rafinesque (Nautilus, 
XXXIII, 1920, pp. 127-130). 
OrtMANN, A. E., The Anatomy of Certain Mussels from 
the Upper Tennessee (Nautilus, XXXIV, 1921, pp. 81-91). 
