468 PROCEEDINGS OF THE ACADEMY OF [1898. 



NEW SPECIES OE DIATOMS. 

 BY CHARLES S. BOYER. 



RHABDONEMA. 

 Rhabdonema Woolmanianum n. sp. Boyer. 



Valve oblong, with sharply crenulate margin, punctate, the puncta 

 in transverse rows, about 6 in .01 ram. Pseudoraphe indistinct. 

 Septa perforate, connected with each other usually near alternate 

 ends by straight transverse diaphragms. 



L. of V. .155 ram. to .231 ram. 



Fossil in the Miocene deposit from an artesian well at Asbury 

 Park, N. J., at a depth of 40 ft. Not uncommon. 



Approaches R. hamuliferum Kitton and R. Musica Brum, but it 

 does not show either hooked septa as in the former nor curves re- 

 sembling musical notes as in the latter. It also differs in the char- 

 acter of the margin and in size, being four or five times larger than 

 either. 



Plate XXIV, figs. 1, la, lb. 



BIDDULPHIA. 

 Biddulphia interrupta n. sp. Boyer. 



Valve elliptical, with small, rounded processes. Surface convex, 

 finely punctate, the puncta about 10 in .01 mm., radiating in scat- 

 tered lines from the centre at which are three minute spines. About 

 one-third the distance from centre to processes, at each end, a 

 hyaline band produced by the interruption of puncta, crosses the 

 valve transversely extending nearly to the sides. 

 L. ofV. .112 mm. 

 Campeachy Bay. Rare. 

 Plate XXIV, fig. 2. 

 Biddulphia verrucosa n. sp. Boyer. 



Valve suborbicular, convex. Processes very large, cylindrical, 

 truncate. Surface coarsely reticulate, the reticulations unequal, 

 irregular, about 2 in .01 mm. Within the reticulations are coarse 

 puncta abont 3 in .01 mm. 

 L. ofV. .138 mm. 

 Fossil at Redondo Beach, Cal. Very rare. 



