Teleosts, embryology of 

 Termitidium amissum 



rugosum . 

 Trichiulus 



Turritopsis nutricula 

 Worms, classification of 

 Xenoneura antiquorum 



509 



Page 



388 



1 



338 



ERRATA. 



Page 18, Hue 5 and Dote 2, for Archimantis read Litho- 

 mautis. 



Page 19, line 15, for Ledrophora read Legnophora. 



Page G8, line 20, for iuternomedian read externomedian. 



Page 138, heading, for Sytlactis read Stylactis. 



Page 150, line 19, for arrayed read arranged. 



Page 171, line 2, for figs. 16, 18 read figs. 16-18. 



Page 240, 2d line of note, for Lisyra read Sisyra. 



Page 299, 9th line from bottom, 1st column, for breto- 

 nensis read bretonense. 



Page 323, line 29, for cold read coal. 



Page 323, last line but one. for Palephemera read Plate- 

 phemera. 



Page 337, line 5, for irri^u read a-Tptfya. 



Page 347, in centre, for Meganthentomum read Mega- 

 thentomum. 



Page 357, line 31, for non-existing read now existing. 



Page 415, oth line from bottom, for Agalma read 

 Aglaura. 



Page 416, lines 3, 11, 14, 18, for Agalma read Aglaura. 



Page 441, 8th line from bottom, for size read length. 



Note by S. H. Scudder. — By an unfortunate accident, three of the species described in the memoir on Palaeozoic cock- 

 roaches have been ascribed to the wrong discoverer and to an incorrect horizon and locality, yecymylacris heros (p. 54, 

 pi. 5, fig. 9), Archimylacris parallelum (p. 85, pi. 6, fig. 6), and the species described without a name (p. 128, pi. 6, 

 fig. 13), were all discovered by Mr. R. D. Lacoe, and not by Mr, Mansfield, in the neighborhood of Pittston, Penn. 

 Necymylacris heros, like the single other species of the same genus, was found in a heavy black shale in the lowest pro- 

 ductive coal measures, or the roof shales of vein C. Archimylacris parallelum and the other species came from Camp- 

 bell's ledge, near the bottom of the interconglomerate (Rogers, No. XII). It is clue to these gentlemen to state that 

 the mistake is entirely mine. 



