CELLULOSE. ALGACE.E. 119 



Suborder IV. DIATOMACE^E. 



Tribe XXIV. Fragilariece. 



554. FRAGILARIA, Lyngb. FRAGILARIA. 



686. F. pectinalis, Lyngb. Pectinated Fragilaria. In rivers and 

 stagnant waters in the county. common 



687- F. diatomoides, Grev. Diatomalike Fragilaria. Parasitic on 

 some Algae on our coast : Dr. W. H. Harvey. rare. 



555. STRIATELLA, Ag. STRIATELLA. 



688. S. arcuata, Ag. Curved Striatella. On the marine filiform 

 Alc/ce, along the coast : Dr. W. H. Harvey. common. 



556. ACHANTHES, Ag. ACHANTHES. 



689. A. longipes, Ag. Longstalked Acanthes. On filiform marine 

 Algae, along the coast : Dr. W. H. Harvey. very rare. 



557. ISTHMIA. Ag. ISTHMIA, 



690. I. obliquata, Ag. Oblique Isthmia. On other Alg(B common. 



558. ODONTELLA, Ag. ODONTELLA. 



691. O. aurita, Ag. Auriculated Odontella. On Calithamnion 

 polyspermum, near Youghal : Miss Ball. very rare. 



559. DIATOMA, Ag. DIATOMA. 



692. D. marinum, Lyngb. Marine Diatoma. Parasitic on other 

 Algce. Along the coast : Dr. W. H. Harvey. common. 



693. D. tenue, Ag. Slender Diatoma. Pools, &c. : Dr. W. H. 

 Harvey. rare. 



694. D. flocculosum, Ag. Flocculose Diatoma. In pools, &c. Para- 

 sitic on Confervce : Dr. W. H. Harvey. rather rare. 



560. EXILARIA, Grev. EXILARIA. 



695. E. fasciculata, Grev. Fasciculated Exilaria. Parasitical on 

 filiform Alg<R : Dr. W. H. Harvey. very common. 



696. E. truncata, Grev. Truncated Exilaria. In ponds and 

 ditches parasitic on Confervce : Dr. W. H. Harvey. common. 



Tribe XXV. Styllariece. 



561. MERIDION, Ag. MERIDION. 



697. M. circulare, Ag. Circular Meridian. In ponds : Dr. W.H. 

 Harvey. On stones or mixed with Confervce rather rare. 



562. LICMOFHORA, Ag. LICMOPHORA. 



698. L. flaldlata, Ag. Flalettate Licmophora. Bantry bay : Miss 

 Hutchins. Parasitic on Zostera marina, &c. rare. 



