EKRATA. 



Page 1, line 13, for "Flordia," read Florida. 



11, ■' 35, '• "immargination," read emargination. 



16, " 26, " "spistome," read epistome. 



31, " 18, " " Podopthalmia," re&d Podoj)hthalmia. 



35, " 9, " " Eucreie" read Micr ate. 



35, last line but one, for " margin," read margins. 

 106, line 4, from foot, for "Norton Street," read Blake Street. 

 108, " 11, " " "twenty rods," read twenty-one rods. 



118, " 11, for "st^'iferus," read styliferus. 



138, " 11, " " immargination," read emargination. 



139, " 11, " " immarginate," read emarginate. 

 153, first line of foot note, for "is marked 3," read is marked 3^. 

 162, above '^ Euryplax," insert CAECiNOPLACiDiE. 

 188, line 8, for "spinosus," read spinosum. 

 197, " 31, " "palpaster," read poljaaster. 

 343, in title of paper, for " 1873," read 1872. 

 343, under No. 5, for "varible," read variable. 

 346, No. 24, line 7, for " Montague," read Montague. 

 348, No. 44, for " Euteromorpha," read Enteromorpha. 



