ANIMAL NATURE OF DIATOME^. 453 



acutis ornatis, papillis minutissimis regulariter dispositis 

 07nnino tectis; naviculis arete seriatis mediocribus (0'0264) 

 longitudine latitudinem fere quadruple 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 decimillimetres 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 0-0007 in height, and are arranged 

 in a quincunx. 



ScMzonema Corinaldi, Mgh. 



8. parasiticum, pumilum, viride, fills subsimplicibus 

 setaceis, naviculis seriatis, minutis (0"016) longitudine 

 latitudinem fere quintuplo superante, e facie exacte linea- 

 ribus, e latera anguste ellipticis. 



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

 without a name, from Marseilles. 



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

 laria scoparia, or upon Polysiphonice, 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. 



ScMzonema Zanardinii, Mgh. 



S. tenuissimum, pallide virens, filis capillaribus in ranios 

 arachnoideos corymbosos monosiros sensim solutis, naviculis 

 laxe seriatis mediocribus (0'025), longitudine latitudinem 

 quadruplo superante, e facie exacte linearibus, e latere 

 ellipticis. 



