CORRIGENDA AND ADDENDA. 



Page 



12, twenty lines from bottom, for " hinder pair of true thoracic limbs," 

 read " pair of true thoracic limbs." 



42, 43. I should have added, that the number of the segments in the 

 cirri increases with the age of the specimen ; but that the 

 relative numbers in the different cirri keep, as far as I have 

 seen, nearly constant ; hence the numbers are often given in 

 the descriptions. 



99 et passim, for Psecilasma, read Pcecilasma. 



156. In a foot-note, I have alluded to a new genus of sessile Cirripedes, 

 under the name of Siphonicella, I now find that this species 

 has been called, by Professor Steenstrup, Xenobalanus glo- 

 bicipitis. 



