I 



291 



177. Moles J. J. — Cleaning Diatoms. — Microsc. BuUelin ofPhi- 

 ladelphia Jiine 1890. 



178. Morland H. — Oa mesuring figures of microscopie objects. — 

 Journ. Quek. Micr. Club p. 104, Julj 1890. 



179. Nelson E. M. — Structure of the Diatom Valve. — Journ. 

 Quek. Micr. Club p. 214, July 1890. 



180. Pelletan J. — Les perles du Pleurosigma angulatuin. — Jour- 

 nal de Micrographie 1890, n. 2, p. 43. 



181. Petit P. — Note relative aux diatomées du Japon. — Journal 

 de Micrographie, Mars 1890. 



182. Rattray J. — Revision of the genus Actinocyclus. — Journ. 

 Quekelt Micr. Club July 1800. 



NB. Per mancanza di spazio i resoconti verranno pubblicati nel prossimo 

 lascicolo (Gennaio 1891). 



G. B. De-Toni. 



