182 CRYPTOGAMIA. 



This species, in its deeply concave sides and peculiar markings, 

 appears quite distinct from all except T. WilJcesii, of which it may 

 be a variety. 



* Triceratium gibbosum, Bail. & Harv. (Tab. 9, fig. 32.) 



T. parvum, subcylindricum, lateribus valde convexis, angiitis prominen- 

 tibus, superficie ut in T, Wilkesii notata. 



A small species, remarkable for its almost cylindrical form. 



T ON Q AT ABU, 



Synedra superba, Kutz. 

 Synedra biceps, Kutz, 

 Grammatophora oceanica, Ehr. 

 Epithemia Musculus, Kutz. 

 Biddulphia pulchella, an Dentalla?. 



