CORRECTIONS 
Page 17. For Genus “ Streptoplasma,” read “ Streptelasma ; from Crpsirro?, twisted, and 
sXao>a, lamella .” This error occurred in changing the generic name from Strep- 
tophyllum, which was the original name in MS. 
Page 23. For specific name “ deformata,” read “deformis.” 
32. Under Genus Bucania, third paragraph, first line, for “axis,” read “plane.” 
36, second line from the top. For “depositions,” read “deposits.” 
81. For read 
104, fig. 1 ui. For “interior of ventral valve,” read “interior of dorsal valve.” 
Note. For description of the ventral valve of this species, see pag. 287, fig. 2 k, pi. 79. 
The Genus Platynotus (page 235 of this volume) must give place to that of Lichas. This 
genus, instituted by Dalman in 1826, has not been recognized until recently, the figure and 
description of that author affording very unsatisfactory means of identification. Dr. Loven (Ofv. 
nf. Kongl. Vet.-Ak. Forsh. 1845, pag. 55, tab. 1, fig. 7 a.) gives a figure of Lichas ( Entomostra- 
cites) laciniatus, Wahl., showing it to be generically identical with our PlatyiuAus trentonensis 
and P. boltoni. I had unaccountably overlooked this fact, until recently receiving the work of Dr. 
Beyrich (1845 and 1846), where this genus is still further illustrated. 
In the note on page 235, sixth line from the bottom, for “ hijbernica,'" read “ hibernica." 
Atrypa capax (Conrad, Jour. Acad. Nat. Science, Vol. viii, pag. 264, pi. 14, fig. 21) is pro¬ 
bably identical with A. increbescens (page 146 of this volume, plate 13, figs, a - y). The specimen 
of Mr. Conrad, if the same, is an extremely inflated form. 
Ceraums pustulosus (pag. 246, pi. 61, fig. 2). This species, described from a fragment, proves 
to belong to the Genus Harpes, of Goldfuss. 
