ANIMAL NATURE OF DIATOME^l. 453 



acutis ornatis, papillis minutissimis regulariter 

 omnino tectis; naviculis arete seriatis mediocribus (0:0264) 

 longitudine latitudinem fere quadruplo super ante, e facie 

 leoiter elliptico truncatis, e latere anguste ellipticis, obtusi- 

 usculis. 



Sig. Botteri sent it from Lesina to his friend Zanardini, 

 by whom it was communicated to me. 



It scarcely attains two centimetres in length; the 

 threads are about two decirnillimetres in thickness, the 

 colour dark green. The greatest breadth of the primary 

 surfaces is rather less 0*007 ; that of the secondary 

 0'0043 ; the papillae appear hemispherical or slightly 

 conical; they are O'OOO? in height, and are arranged 

 in a quincunx. 



Schizonema Corinaldi, Mgh. 



S. parasiticum, pumilum, viride, flis subsimplicibm 

 setaceis, naviculis seriatis, minutis (O'OIG) longitudine 

 latitudinem fere quintuplo superante, e facie exacte linea- 

 ribus, e latera anguste ettipticis. 



Corinaldi found it at Genoa, and Solier sent it to me, 

 without a name, from Marseilles. 



It is parasitic, like the preceding, growing on Scaphu- 

 laria scoparia, or upon Polysiphonite, and in like manner 

 is about two centimetres long. The threads, slightly 

 mucous, are a decimillimetre and a half in thickness. 

 They are usually simple ; the few ramifications are short 

 and divaricate. 



Schizonema Zanardinii, Mgh. 



8. tenuissimum, pallide virens, fills capittaribus in ramos 

 arachnoideos corymbosos monosiros sensini solutis, naviculis 

 laxe seriatis mediocribus (0 - 025), longitudine latitudinem 

 quadruplo superante, e facie exacte linearibus, e latere 

 ellipticis. 



