P.IDDULPHIA. 



469 



Fig. 205 B. (Amphitetras) 

 an tediluviana. 



Fig. 206. B. ( ' Ampliipentas) 

 punctata. 



Under the name of Capsula, Prof. Brun (Le Diat., ii., 1896, p. 235), has 

 separated from Triceratium certain exotic forms having an internal valve with 

 a triangular space curiously fashioned so as to recall the structure of the 

 Entogonia. In this genus Mr. Brun includes two new species, C. Barboi J. 

 Br. and C. biformis J. Br., both from " Colonial " as well as some old forms 

 T. denticulatutn Grev., etc. 



Lastly, Mr. H. Peragallo has doubtfully suggested the genus Ceratanlina 

 (in Monog. Rhizosolenia) which is differentiated from Ccraiauhts by the 

 relatively great length of the sutural zone, and by its uninterrupted annulation. 

 He includes in it the single form C. Bergonii, found in a pelagic state at 

 Trouville and in the Mediterranean. 



We shall proceed to the examination of the forms from our district. 



