KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 26. N:0 2. 35 



oblique striae equidistant, 20 to 24 in 0,oi mm.; angle about 60°. — P. Nubecula W. Sm. B. D. I 

 p. 64 PI. XXI f. 201. (tRUN. a. D. p. 52. Per. V f. 26. P. Nub. var. parvula Grun. A. D. p. 52. 

 P. Thumii Castr. in Per. p. 14 PL V f. 25 (1891). 



Marine: Finmark! North Sea! Adriatic (Grun.), Sumatra (var. in L. 0,i4; B. 0,oi4 mm. 

 Striae 26 in 0,oi mm.)! California! 



Var. intermedia W. Sm. (1853). — L. 0,i4 to 0,44; B. 0,o2 to 0,022 mm. Striae 20 to 22 in 

 0,01 mm. — P. interm. W. Sm. B. D. I p. 64 PI. XXI f. 200. V. H. Syn. p. 116 PI. XVIII f. 6. 

 Per. p. 13 PL V f. 27, 28. 



Marine: Nortb Sea! Port Jackson! 



Var. amphipleuroides Grun. (1867). — L. 0,i3 to 0,3 mm. Striae 24 to 27 in 0,oi mm. — P. 

 interm. v. amphipl. Grun. Hedwigia 1867 p. 29. 



Marine: Honduras (Grun.). 



Var. subrecta Cl. (1880). — L. 0,28; B. 0,022 mm. Transv. and obi. striae 'Vm '^/is- 'V19 i^i 

 0,01 mm. — P. subrect. Cl. A. D. p. 14 PL III f. 72. Per. V, 30. P. elongatum var. balearica 

 Per p. 7 PL II f. 22. 



Marine: Greenland! Finmark! Sea of Kara! Balearic Islands! 



Var. mawritiana Grun. (Ms). — L. 0,i3 to 0,i6; B. 0,012 to 0,oi3 mm. Transv. and obi. 

 striae 22,5 in 0,oi mm. 



Marine: Mauritius (Grun.). 



There is no diiference between P. Nubecula and P. intermedium except in the size. By its 

 varieties P. Nubecula is closely connected with P. elongatum. 



2. P. Peragalli Brun. (1891). — V. narrow lanceolate, gradually tapering from the middle 

 to the obtuse ends. L. 0,3; B. 0,04 mm. Central nodule small, rounded. Median line straight, 

 central. Transverse striae closer than the oblique. Transv. and obi. striae >'/i5 (Per)i ^Vig (Brun's 

 fig.) in 0,01 mm. — P. Pera^. Beun. in Per. p. 9 PL III f. 20. D. esp. n. PL XX f. 6. 



Marine: Japan, fossil (Brun.). 



Var. perangusta Cl. — L. 0,3; B. 0,oi8 to 0,024 mm. Transv. and obi. striae 17131 "/le 

 in 0,01 mm. 



Marine: China (Deby Coll.)! Balearic Islands! 



Var. gracilior Cl. — L. 0,i8; B. 0,012 mm. Transv. and obi. striae ^Yi9 ^^ 0)0i raxa. 



Marine: China (Deby Coll.)! 



This species seems to be nearest akin to P. subrigidum and P. longum. It has exactly the 

 shape of P. intermedium, but the striation is different. 



3. P. ibericum Per. (1891). — V. narrow lanceolate, with slightly rostrate, obtuse ends. 

 L. 0,09 to 0,12; B. 0,0 15 to 0,02 mm. Median line central, slightly flexuose, curved at the ends. 

 Transv. and obi. striae ^^aoi ^V22 (Per.), ^^/jj in 0,oi mm. Median striae less acute. — Per. p. 8 

 PL III f. 12. 



Marine: Balearic Islands! 



4. P. cuspidatuiu Cl. (1881). — V. broad, lanceolate, scarcely sigmoid, with produced and 

 rostrate ends; L. 0,o7 7 to 0,i; B. 0,022 to 0,025 mm. Median line straight, central. Transv. and 

 obi. striae "/jg, ^"/ji. "Act ■'V22' '^724 ^^ *^'0' ^^- — ^- lanceolatum var. cusp. Cl. N. R. D. p. 5 

 PL I f. 7. Per. V. f. 16. 



Marine: Firth of Tay! Port Jackson! 



5. P. directum Grun. (1880). — V. rhombic-lanceolate, subacute. L. 0,243; B. 0,o4 mm. 

 Median line straight, central. Transv. and obi. striae 18,5 in 0,oi mm. Angle 60°. — Grun. A. D. 

 p. 53. Cl. M. D. N:o 125. Per. V. f. 29. 



Marine: Antarctic Ocean (Grun.). 



