ERRATA. 
In the generic descriptions of the Unionidz Mr. Simpson has described both shell 
and animal. This statement is made in view of the fact that on page 50 Mr. Simpson's 
name is placed after both shell and animal descriptions, and follows only that of the 
animal in the descriptions of the other genera. 
Page 11, third line, for Glenn read Glen. 
Page 17, eighteenth line, for oarolinensis read carolinensis. 
Page 17, thirty-sixth line, omit Quadrula pustulata (not found in our area). 
Page 18, tenth line, for Quadrula parva read Lampsilis parvus. 
Page 18, et al, in place of Elimia use Goniobasis. (See Part II.) 
Page 22, No. 117, for complanatus read campanulatus. 
Page 23, twenty-seventh line, for decisium read decisum. 
Page 28, forty-third line, for albolabris read thyroides. 
Page 26, ninth line, for Vitrze read Vitrez. 
Page 28, fifteenth line, for Anadonta read Anodonta. 
Page 33, footnote, for Witmerstone read Witmer Stone. 
Page 35, No. 24, for Lymnza read Limnza. 
Page 44, twenty-second line, insert a comma after the word elongated. 
Page 44, thirty-fifth line, insert a comma after the word small. 
Page 46, last line, for Part I., 1890, read Part III , 1695. 
Page 47, fifteenth line, for radiacal read radial. 
Page 62, twenty-first line, for fig. 4 read fig. 3. 
Page 62, twenty-second line, for Anadonta read Anodonta. 
Page 64, twenty-ninth line, for U. read A. 
Page 67, ninth line, for pl. xii., read pl. vii. 
Page 69, last line, add (Simpson). 
Page 73, twenty-fifth line, for bronchiz read branchize 
Page 73, last line, for pressus, read pressa. 
Page 100, for Section Euryma read Eurynia. 
Page 103, thirteenth line, omit reference to pl. xxvii (Anodonta grandis). 
Page 109, for Section Corunculina read Carunculina. 
Page 111, thirty-first line, add the word ‘‘as"’ after the word laterals. 
Page 116, nineteenth line, for Sarratogea, read sarratogea. 
Page 120, twenty-seventh line, for spherium, read Sphezrium. 
Explanation of Plate VII., for Alasmodonta edentula read Strophitus edentulus. 
Explanation of Plate XIX., No. 3, for coccina, read coccinea. 
Explanation of Plate XX., Obliquaria cornuta Barnes, read Obliquaria reflexa Raf. 
Explanation of Plate XXVII., No. 8, for Sinsley, read Linsley. 
ee 
