KONGL. SV. VET. AKAUEMIENS HANULINGAK. BAND 27. N:0 3. 27 



50. N. directa W. Sm. (1853). — V. narrow, gradually tapering from the middle to 

 the acute ends, about 10 times longer than broad. Central pores of the median line approxi- 

 mate. Axial area indistinct; central area small. Striae 4 to 11 inO,oi mm., distinctly transversely 

 lineate. 



Var. suhUlis Greg. (1857). — L. 0,u9 to 0,012; B. 0,nu8 mm. Striae 10 to 11 in 0,ui mm., 

 finely lineate. — I'inn. subtilis Greg. D. of Clyde p. 488 PL IX f. 19. N. directa car. suU. Cl. 

 Vega p. 467. Pinnul. acutiuscula Greg. T. M. S. IV p. 48 PL V f. 21 (1856)? 



Marine: Iceland! Scotland (Greg.), Sea of Kara! Cape Wankarema! 



Var. genuina Cl. — L. 0,o7 to 0,125; B. 0,oo8 to 0,012 mm. StriiB about 8 in 0,oi ram., 

 finely lineate. — N. directa W. Sm. B. D. I p. 56 PL XVIII f. 172. A. S. Atl. XLVIl f 4, 5. 

 N. dir. V. angusta Grun. A. D. p. 39. 



Marine: Spitsbergen! Finmark! Sea of Kara! Cape Deschneif! North Sea! Yokohama! Arctic 

 America! Greenland! 



Var. remota Grun. (1880). L. 0,i6 to 0,2; B. 0,015 mm. Striae 4 to 5 in 0,oi mm., coarsely 

 lineate; lineolae 17 to 21 in 0,oi mm. - A. S. N. S. D. Ill f. 2. Atl. XLVII f. 1, 2, 8, 0. Pitm. 

 longa Greg. T. M. S. IV p. 47 PL V f. 18 (1856)? 



Marine: Spitsbergen! Finmark! Sea of Kara! Mediterranean Sea! Red Sea! Gulf of Mexico 

 (Atl.), Colon! Campeachy Bay (Atl.). 



Var. Incus A. S. (1876). — L. 0,13 to 0,15; B. 0,oi8 mm. Central area on one side of the 

 central nodule dilated to a short longitudinal space. Striae 4 to 4,5 in 0,oi mm. Lineolae about 

 24 in 0,01 mm. — N. Incus A. S. Atl. XLVII f. 7. 



Marine: Mediterranean Sea (Atl,), Sumbava (Kinker Coll.)! Colon! 



Var. javanica Cl. — L. 0,15; B. 0,oi mm. Striae 5 in 0,oi mm. finely lineate. 



Marine: Sumbava (Kinker Coll.)! 



N. directa is a very variable species, of which I have seen strictly typical specimens only 

 from the Arctic Sea and the North Sea. Specimens from other localities are suspicious. As to 

 N. longa Greg. I have not seen any form accurately agreeing with the fig. of Gregory, which has 

 radiate striae. Pinnul. criophila Castrac. (Challenger Voyage D. p. 26 PL XV f 2) is probably a 

 form of N. directa. 



51. N. Eepesii Grdn. (1884). — V. linear, narrow. L. 0,o85 to 0,095; B. 0,oo8 mm. Areas 

 indistinct. Striae 12 to 13 in 0,oi mm. transverse, finely lineate, forming oblique striae. — Franz 

 Jos. Land D. p. 103 PL I f 37. 



Marine: Franz Josefs-Land (Grun.). 



52. N. jejuna A. S. (1876). • — V. narrow, linear, with rounded or somewhat cuneate ends. 

 L. 0,1 to 0,12; B. 0,01 mm. Axial area indistinct. Central area small, elongated. Striae 5 in 

 0,01 mm., parallel, or slightly radiate throughout, distinctly lineate. — Atl. XL VI f. 76. Castr. 

 Challenger Voy. p. 33 PL XX f. 12, XXVIII f. 11. 



Marine: Java (Atl.), Sumatra (Grove Coll.)! Singapore! Macassar Straits! Japan! 



53. N. trigonocephala Cl. (1883). — V. linear, with cuneate ends. L. 0,05 to 0,o6 5; B. 0,oi 

 to 0,012 mm. Axial area indistinct. Central area small. Striae 10 to 12 in O.oi mm., almost 

 parallel, transversely lineate, crossed by several undulating, narrow longitudinal bands. — Vega 

 p. 468 PL XXXVI f. 29. 



Marine: Cape Wankarema! 



54. N. transitans Cl. (1883). — V. lanceolate, 4 to 6 times longer than broad. L. 0,o65 

 to 0,09; B. 0,016 to 0,02 mm. Axial area indistinct. Central area small, orbicular. Strife 7 to 9 

 in 0,01 mm. parallel, distinctly lineate. — Vega p. 467 PL XXXVI f. 31. 



Marine: Cape Wankarema! 



