KONGL. SV. VKT. AKADEMIRNS HANDLINGAR. R\M) 27. N:() 3. 97 



0,0 1 mm., radiate at the ends. — Nav. Chwic. Greo. I), of (^yde p. 478 PI. IX f. f). A. S. N. 

 S. I). PI. II f. 28. Pant. IT PI. VI f. 110. 



Marine: North Sea (Coasts of Scotland (Ireg.) Sweden! Baleai'ic Islands! Bremia, foss. 

 Hungary (Pant.). 



Var. javanica Cl. — L. 0,04 ; B. 0,()()<) mm. Stria? 18 in 0,(ii mm. parallel. — PI. I f. 24. 



Marine: Java! 



74. P. cruciformis Donk. (1801). — V. linear, often slightly inflated in the middle, with 

 broad, ronnded ends. L. 0,o3 to 0,12; B. 0,oi to 0,014 mm. Median line with rather approximate 

 central pores, and hook-shaped, large terminal fissures. Axial area indistin(!t, central area a broad 

 fascia, dilated outwai'ds and reaching to the margin. Stri;c 10 — 12 in 0,0 1 mm. radiate in the 

 middle, convergent at the ends, crossed by a faint longitudinal depi'ession. — Nav. cruc. Donk. 

 M. J. (N. S.) I p. 10 PI. I f. 7. B. I), p. (15 PI. X f. 4. A. S. N. S. D. PI. II f. 25. V. H. 

 Syn. p. 74 Suppl. A f. 8. 



Marine: Finmark! North Sea (coasts of Sweden, England and Belgium)! Baltic (Trave- 

 munde Dannf.), "West Indies! Cape Horn! Seychelles! 



Var. hrevior Cl. (1883). — L. 0,();ir, ; B. 0,009 mm. Strife 14 in 0,0 1 mm. — Cl. Vega p. 404 

 PI. XXXV f. 18. 



Marine: Cape Deschneff! 



Var. upolensis GtRUN. (1880). — L. 0,058; B. 0,oi mm. Striae 14 in 0,oi mm., slightly ra- 

 diate. — GrRUN. A. D. p. 28. 



Var. Seychellensis Grun. (Grun. 1880). — V. lanceolate, with broad, rounded ends. L. 0,n4;?; 

 B. 0,01 mm. Striae 10 to 12 in 0,oi mm., strongly radiate. — I. c. 



Nar. data Leud. Fortm. (D. de Ceylon p. 27 PI. Ill f. 28, 1879) seems to belong either to 

 P. cruciformis or to Achnanthes inflata Grun. 



75. P. cruciata Cl. (1881). — V. linear, slightly constricted in the middle. L. 0,o87; B. 

 0,0 17 (in the middle 0,oi4) mm. Median line with small terminal fissures, and approximate central 

 pores. Axial area narrow; central a broad fascia, narrowed outwards. Striae 12 in 0,oi ram. pa- 

 rallel. — Nav. cruc. Cl. N. R. D. p. 6 PI. I f. 11. 



Marine: Greenland (?) 



76. P. floridana Cl. (1881). — V. slightly constricted in the middle. L. 0,o4.'j to 0,075; 

 B. 0,01 to 0,012 (ends), O.oos to 0,oo9 (middle) mm. Axial area narrow, distinct; central area a 

 broad, transverse fascia. Striae almost parallel, 15 (middle) to 20 (ends) in 0,oi mm. — Nav. fhi- 

 minensis var. floridana Cl. N. R. D. p. 6 PI. I f. 10. 



Marine: Pensacola (Florida)! 



77. P. exceHens Cl. (18!»0). — V. linear, slender, slightly constricted in the middle, with 

 cuneate ends. L. 0,3; B. 0,u3 (middle) to 0,04 3 (ends). Median line with approximate central pores 

 and small, curved terminal fissures. Axial area narrow, linear, slightly widened in the middle, 

 where on each side of the central nodule is a linear marking. Striffi almost parallel, 15 in 0,01 

 mm., slightly radiate at the ends. — Cl. Diatomiste I p. 31 PL V f. 6. 



Marine: Oamaru Dept., New Zealand (Tempere). 



Var. iuterrupta Cl. (1890). — L. 0,2 1; B. 0,022 to 0,o29 mm. Striae 4 in O.oi mm. Central 

 area a broad, transverse fascia, reaching to the margin. — Cl. 1. c. p. 31. 

 Marine: Oamaru Dept., New Zealand (Deby Coll.)! 



78. P. lobata Grove a. Sturt (1887). — V. panduriform, with subelliptical segments. L. 0,o9 

 to 0,12; B. 0.025 to 0,03; at the constr. 0,oir. mm. Median line with approximate central pores 

 and small terminal fissures. Axial area narrow, linear; central area a broad fascia reaching to the 



K. Sv. Vet AkudiTiiieus IliinilliiiKar. Bd 27. No 3, 13 



