ANIMAL NATURE OF DIATOMEjE. 441 



Schizonema bombycinum, Kiitz., (Micromega.) 

 ScJiizonema patens, Kutz., (Micromega.) 

 Bcldzonema flagelliferum , Kiitz., (Micromega.) 

 Schizonema lineatum, Kiitz., (Micromega.) 



Kiitzing says the NaviculEe are ^ to —^ of a line in 

 length, or 0-0346 to 0-027 millim. The largest of his 

 figures is 6-5, corresponding to 0-0155. In an authentic 

 specimen from Spalato, with which Kiitzing obHged me, 

 and in the corresponding ones from Zara, collected Ijy 

 Sandri, the extreme length of the Naviculse is 0-02, 

 and the greatest breadth of the primary surfaces is 

 0-0047 millim. 



Schizonema floccosum, Rudolph, (not Kiitz.) 



The length of the Naviculse indicated by Kiitzing is 

 i^th of his line, or 0-045 milhm. In specimens collected 

 in Dalmatia by Vidovich, which correspond with the 

 description, the greatest length of the Naviculse is 0046, 

 the breadth of the primary surfaces 0-005 millim., in single 

 individuals ; the breadth of individuals very near a state 

 of duplication was almost double, and that of the se- 

 condary surfaces, which are elliptico-rhomboidal, 0-009. 

 In this very distinct species the extraordinary thickness 

 of the partial tubes is remarkable ; they are often more 

 than double the breadth of the Naviculse. 



Schizonema hyalinum, Kiitz., (Micromega.) 



The length assigned by Kiitzing is ,^5 to ith of a hne 

 = 0-04 1 6 to 0-0338 milUm. The greatest length, in plate 

 xxiv, is represented (sf^) 7-5, or 0-0179'", and the greatest 

 breadth, in plate xxv, 1-5, or 0-0036 millim. In numerous 

 specimens from Dalmatia, transmitted to me by Vidovich, 

 and corresponding perfectly to the descriptions and the 

 figures, I find the greatest length 0-034, and the 



