448 ANIMAL NATURE OF DIATOME.E. 



Schizonema Jloccosum, Kiitz. 



If, as seems probable, there exist partial tubes in this 

 species, and we ought therefore to retain it in this genus, 

 it is necessary to change the specific name, for there is 

 already a Schizonema fioccosum of Rudolphi. By the 

 customary laws, we ought to name it S..Kiitzingii. 



Schizonema crispum, Montag. 

 Schizonema plumosum, Kiitz. 

 Schizonema capitatum, Kiitz. 

 Schizonema tricliocephalum, Kiitz. 



I find a Schizonema, from Marseilles, with which I was 

 favoured by Solier, and in which the Naviculse are 0'025 

 in length, to correspond exactly with the definition and 

 the figure of Kiitzing. He says they are as much as ^ 

 of a line = 0*0225 millirn. There are evidently partial 

 tubes, and the figure of Kiitzing leads us to suspect their 

 existence. 



Schizonema Bryopsis, Kiitz. 



Schizonema Arbuscula, Ehrenb. (Naunema.) 



Although Ehrenberg asserts that there are no partial 

 tubes, still he admits that this species forms a transition 

 to the genus Micromega. Kiitzing's figure, by analogy 

 with other species, induces us to admit their presence. 



Schizonema liydruroides, Kiitz. 



I cannot help observing that Kiitzing, the most acute 

 observer and most faithful painter of nature, has in this 

 species also clearly delineated the special tubes, though 

 he has placed it in the genus Schizonema. 



