DIATOMACEAE. 343 
Grammatophora hamulifera, Kutz. 
Cobo, at low-water mark, a few specimens. 
Grammatophora serpentina, Ralfs. 
Very common. 
Rhabdonema arcuatum, Kutz. 
Common generally. 
Rhabdonema minutum, Kutz. 
Rhabdonema adriaticum, Kutz. 
Common in low-water gatherings. 
Striatella unipunctata, Ag. 
Common on algae in rockpools at Bordeaux, Cobo, and Salerie. 
BIDDULPHIEAE. 
Isthmia enervis, Ehr. 
Plentiful and fine at Cobo and Petit Bot. Less common in 
gatherings from several other parts of the coast. 
Biddulphia pulchella, Gray. 
More or less common at low-water mark. 
Biddulphia Regina, Sm. 
‘Occurs in three of the gatherings: ought to be sought for 
growing.’ (Rylands.) 
Biddulphia aurita, Breb. 
Biddulphia Rhombus, Sm. 
Biddulphia Baileyi, Sm. 
Scattered specimens have occurred in nearly all my low-water 
gatherings, but they would not amount to very many in the aggregate. 
Mr. Rylands quotes a note on this species by Dr. Wallich: ‘ Taken 
with the skimming-net : evidently a floating species,’ 
Biddulphia granulata, Roper. 
Biddulphia turgida, Sm. 
I have only met with a single specimen of this species, in a 
gathering from Cobo: but Mr. Rylands gives ‘ Pond and beach at 
the Vale: plentiful in the slides.’ 
Triceratium Favus, Ehr. 
Triceratium alternans, Bail. 
Triceratium striolatum, Ehr. 
