KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 27. N:0 3. 149 



the valve forming transverse and decussating tows. Transverse row^s 9, oblique rows 8 in 0,oi 

 mm. Marginal puncta frequently double. — Cocc. Wr. O'M. M. J. N. S, VII PL VII f. 6? 

 Petit D. Campbell p. 12. PL IV f. 3? 0. barbadensis var. nanJworensis Grun. Novara p. 98 

 PL 1 ^ f. 10 (1867)? 



Marine: Cape Horn (Petit Coll.)! 



None of the figures corresponds exactly with this species, so that the identification is 

 doubtful. As Orthoneis Pethoi Pantocsek has figured (III PL IX f. 148) a similar, but acumi- 

 nate form. 



18. 0. barbadensis Grev. (1864). — V. elliptical to orbicular. L. 0,05 to 0,o8; B. 0,o3 to 

 0,0 5 mm. Loculi? Median line slightly undulate. Puncta more crowded near the margin, where 

 they form short strise, about 8 in O.oi mm., transversely elongated at the median line (9 in 0,oi 

 mm.), where they form a longitudinal band on both sides of the line. The puncta of the valve 

 are larger towards the median line than towards the margin and form elegantly curved decussa- 

 ting rows. — Cocc. barbadensis GtRev. T. M. S. XII p. 14 PL II f. 10. Cocc. naviculoides G-rbv. 

 T. M. S. XIII p. 34 PL IV f. 24 (1865). 



Marine: Barbados, foss.! Oamaru, New Zealand, fossil! 



Var.(?) tenuipunctata Brun (1893). — L. O.12 to 0,i5 mm. Strise 10 to 12 in 0,oi mm. — 

 Diatomiste I p. 176 PL XXIV f. 8. 

 Marine: Oamaru, fossil. 



19. 0. Grovei Cl. (1892). — V. elliptic-lanceolate, subacute. L. 0,i to 0,ii; B. 0,o4 to 

 0,04 5 mm. Central area small, subquadrate. Median line undulating. Loculi subequal, quadrate, 

 about 3 in 0,oi mm., forming a band along the margin. Transverse rows of puncta 9 in 0,oi mm.; 

 oblique rows 10 in 0,oi mm. Transverse rows not ending with double rows. Puncta along the 

 median line not elongated. — M. Grovei Cl. Diatomiste I p. 161 PL XXIII f. 10. 



Marine: Barbados, foss.! 



Var. rhombica Cl. — V. rhombic-lanceolate. L. 0,i ; B. 0,025 mm. Central area small, 

 with some isolated puncta. Striee as in the type, but near the margin crossed by a narrow blank 

 line. - PL II f. 14. 



Marine: Barbados, fossil (Deby Coll.)! 



20. 0. cribrosa Grdn. (1860). — Elliptical. L. 0,034 to 0,05; B. 0,027 to 0,o3 mm. Loculi 

 quadrate, 2 to 4 in 0,oi mm. forming a band along the margin. Median line straight. Central 

 area indistinct. Transverse rows of puncta 7 to 10 in 0,oi mm. not ending with double rows of 

 small puncta. Oblique rows of puncta gently curved. — Mastogl. cribrosa Grun. Verb. 1860 

 p. 577 PL VII f. 10 c. Orthon. cribr. Grun. Novara p. 16 (1867). V. H. Syn. PL XXVIII f 6. 



Marine: Adriatic! Nicobar Islands (Grun.), Port Jackson! Japan! Samoa! Tahiti! 

 0. cribrosa greatly resembles 0. fimbriata, but the loculi are entirely different, and there 

 are no double rows of small puncta at the end of the transverse rows. 



21. 0. Horvathiana Grun. (1860). — Elliptical. L. 0,035; B. 0,024 mm. Loculi 5 to 8 

 in 0,01 mm., rectangular, forming a broad band along the margin. Transverse rows of puncta 15 

 in 0,0 1 mm. Oblique rows gently curved. — Mast. Horvath. Grun. Verb. 1860 p. 578 PL VII 

 f. 13. A. S. Atl. CLXXXVIII f. 41. 



Marine: Red Sea (Grun.), Samoa! Tahiti (Grun.), Honduras (Grun.), Java (Atl.). 

 Nearly akin to 0. cribrosa and differing in its closer loculi and finer striations. This may 

 probably be regarded as 0. cribrosa var. 



22. 0. cocconeiformis Grun. (1860). — Orbicular. L. 0,o36; B. 0,028 to 0,03 mm. Loculi 

 8 in 0,01 mm., rectangular, forming a broad band along the margin. Puncta forming radiate 



