ADDENDA ET CORRIGENDA. 



Page 5, line 1 \,for studied, read stated. 



7, line 9, /or the genus Diadesmis substitute the genus Achnanthidium. 

 11, add to the instances of Conjugation in Epithemia, E. Zebra; noticed by Mr.Thwaitos 



in Ann. Nat. Hist., Nov. 1847. 

 21, to the description of Cocconeis Placentula, add, Striae 45 in •001" ; and to habitat, 

 In Conjugation, Lewes, Feb. 1853. 



23, line 5, for Orthosira sulcata, Kiitz., read Melosira sulcata, Kijtz. 



24, to the locality oi Eupodiscus crassus, add, Stomach of scallop, Feb. 1853. 



25, to the habitat of Eupodiscus sculptus, add, Isle of Dogs, Mr. Roper. 



27, Triceratium striolatuml Ehr. Specimens from Mr. Brightwell have satisfied me 



that this is not T. sfriolatum of Ehrenberg ; I therefore propose for it the name 



of T. undulatum. 

 29, to the localities of Campylodiscus spiralis, add, Newhaven, Sussex, Dec. 1852, 



W. Sm. 

 33, Surirella panduriformis is probably a var. of S. pinnata. 

 35, for n. sp. annexed to Tryblionella Scutellum, read W. Sm. 

 40, add to the habitat of Nitzschia angularis, Poole Bay, Sept. 1849, W. Sm. 

 51, last line but one, insert a full stop after 42, and read in continuation, Var. /3. Ehr. 



Inf. xiii. 7, ef seq. 



