80 THE DIATOMACE.E OF PHILADELPHIA AND VICINITY 



BREBISSONIA PALMERII, N. SP. 



Valve rhombic-lanceolate, with cuneate ends and produced apices. Central nodule 

 more elongate and terminal fissures further from the ends than in B. bceckii. 



Pavonia, N. J. (artesian well, depth of 40 ft.). Rare. 



PI. 17, Fig. 8. 



I take pleasure in naming this species after Mr. T. Chalkley Palmer, of Media, Pa., 

 the author of numerous papers on the Diatomaceae. 



Lewis partly describes a similar form, which he does not name, as a species of 

 Navicula found in the blue clay at Kaighn's Point, N. J. (Lewis, "New and Intermedi- 

 ate Forms," etc., p. 15, PL 1, Fig. 8.) 



ANOMCEONEIS PFITZER (1871) 

 (anomoios, unlike, and neis (naus), a boat) 



Valve lanceolate, axial area narrow, central area widened; transverse strise punctate, 

 the puncta in longitudinal rows or interrupted by blank lines. 



A single chromatophore lies along one of the girdle sides and extends over the valves, 

 each of the two parts being deeply notched or slit at the ends. According to Schmitz there 

 are two pyrenoids, but Heinzerling thinks there is but one. 



Cleve considers this genus not well founded, as it is based upon the cell contents of 

 but one species, the structure of the other species not being known. As the forms here de- 

 scribed are easily recognized by the interrupted puncta, the genus is, at least, convenient. 



ANOMCEONEIS SPILEROPHORA (KUETZ.) CL. 



Valve elliptic-lanceolate, ends rostrate-capitate. Axial area narrow, central area 

 rounded, larger on one side of the median line than the other. Stria? very slightly radiate, 

 16 in 10 n, punctate, the puncta interrupted by longitudinal blank lines. 



Pfitzer states that the central plasma mass is unequal on the two sides. 



Navicula sphcerophora Kuetz. 



Fresh and brackish water. Not common. 



PI. 40, Fig. 2. 



ANOMO3ONEIS SERIANS (BREB.) CL. 



Valve lanceolate, acute; axial area lanceolate; striae, 24 in 10 ju; puncta elongate. 

 Not common in this locality, but abundant northwards; fossil in the peat deposits of 

 New England. 



May's Landing, N. J. 



PL 17, Fig. 12. 



Forma minor Valve rhombic-lanceolate, smaller than the type. 



May's Landing, N. J. 



PL 17, Fig. 13. 



ANOMCEONEIS FOLLIS (EHR.) CL. 



Valve rhomboid, tumid in the middle and obtuse at the produced ends. Central area 

 lanceolate; striae radiate in the middle, transverse at the ends. 

 Navicula follis Ehr. 

 Navicula trochus Kuetz. 



