ERRATA 463 
Page 252, line 19, for “‘bue” read ‘‘blue’’. 
Page 254, line 27, for the adverb. ‘“‘ventrad”’ read as adjective, 
“‘ventral’’. 
Page 255, line 33, insert next line below:—‘‘ (Type, Lastena ohiensis 
Raf.);’’ line 36, separate ‘‘outer”’ and ‘‘and”’. 
Page 256, line 26, for ‘“‘p.’’ read ‘‘Pl.’’; line 36, for “‘ pericardinal’’ 
read ‘‘pericardial’’. 
Page 257, line 10, omit comma after “‘distinct’’ and supply after 
“veining’’. 
Page 258, in Text-Fig. 7, transpose ‘‘AN”’ and ‘“‘PO”’. 
Page 262, line 33, for ‘‘brownsih’’ read ‘‘brownish-yellow’’. 
Page 263, line 22, for ‘‘moss’’ read ‘“‘mass’’; line 33, for ‘‘mosses”’ 
read ‘‘masses”’. 
Page 268, line 35, insert next line below:—‘‘(Type, Anodonta ferus- 
saciana Lea)”’ 
Page 269, line 6, omit “‘External Structures”; line 18, add ‘“‘about’’ 
after ‘‘being’’. 
Page 270, line 30, insert next line below:—‘‘(Alasmidonta undulata 
SOR) ea 
Page 273, line 26, for ““known” read “‘shown’’. 
Vor. LV, Nov 7:— 
Page 312, line 10, before ‘‘containing”’ insert “‘each’’ and for comma 
use semi-colon after ‘‘larvae’’ and also omit “‘are’’; line 11, omit ‘‘situ- 
ated’’; line 12, for ‘‘min’’ read “‘mm’’; line 16, for ‘“‘obtusely’’ read 
“obtuse’’. 
Page 317, line 34, for ‘‘facstolaris’’ read ‘‘fasciolaris’’; as indicated 
in Foot-note for this page, for all statements of ‘‘ Eliipsaria clintonensis 
(Simpson)”’ read “ Ellipsaria occidentalis (Conrad)’’. 
Page 318, line 7, for period after ‘‘p. 301’’ use semi-colon. 
Page 320, line 8, use semi-colon after “‘interdentum’’. 
Page 321, line 22, for ‘‘nodulat”’ read ‘“‘nodulated”’. 
Page 324, line 2, for “J”’ read “‘Jl.”’; line 16, omit comma after 
“‘height’’. 
NMOtme VINO no) 
Page 343, line 30, for ‘‘ pleasii”’ read ‘‘ Peasu’’; (do. page 344, line 
29; do. page 345, line 20); line 32, for ‘‘clolored’”’ read “colored’’. 
Page 345, line 26, for ‘‘ utterbackii’”’ read ‘‘ Utterbackii’’; (do. line 31). 
Page 348, line 18, insert ““IX”’ after “‘pl’’. 
Page 352, line 15, for ‘‘simpsoni”’ read ‘‘Simpsoni’’; (do. page 387, 
line 3). 
Page 353, line 38, for ‘‘bysuss”’ read “‘byssus’’. 
“e 
Vor) LV, No: 'o-— 
Page 387, line 34, for ‘‘teniussimus"’ read ‘‘tenuissimus”’. 
Page 391, line 28, for ‘‘Lamack”’ read ‘‘ Lamarck”’. 
Page 392, line 14, for ‘‘more’”’ read ‘‘not”’ and for ‘“‘not’’ read ‘‘nor’’. 
