452 ANIMAL NATURE OF DIATOMKjE. 



the synonym of Agardh {iS. tenue), it seems more easy 

 to suppose that some mistake may have occurred in the 

 denomination of a specimen,, though received from the 

 author himself, than to suspect so incorrect an observation 

 as would result from the description and figure of this 

 his own species given by Agardh, {Icon. tab. 3.) 



Among the species ascribed to this genus or sub-genus 

 by Harvey, two remain still to be mentioned. 



Schizonema oMusum, Greville. 

 Schizonema Wyattice, Han. 



We ought, finally, to add some species which we could 

 not possibly include in any of the preceding. 



Schizonema Stalianum, Mgh. 



S. parasiticum, lubricum, viride vel viridi-rufescens, 

 fills setaceis, Jonge productis, apice attenuatis, h'regida- 

 riter rmnosis, ramis divergentibus brevibus ; naviculis arete 

 seriatis mediocribus (O'OS), longitudine latitudinem sex- 

 tuplo super ante, e facie exacte linearibus, e latere elongato 

 ellipticis ; parum angustioribus ohtusiusculis. 



Sig. Stalio sent me specimens of this species, found at 

 Lesina, in Dalmatia. 



It attains the length of three or four centimetres, is 

 very mucous, and adheres strongly to paper. The threads 

 {fili) attain almost a decimillimetre in thickness near 

 the base. It resembles none of the before-mentioned 

 species in external appearance, except the 8. helmintosum 

 var. of Chauvin. The partial tubes are very slender, 

 but distinct. Kiitzing, to whom I sent it, acknowledged 

 that it was new. 



Schizonema papillosum, Mgh. 



S. parasiticum, pumilum, mucosissimum, viride, filis 

 ultra setaceis subsimplicibus vel ramulis spiniformibus 



