112 p. T. CLEVE, SYNOPSIS OF THE NAVICULOIl) DIATOMS. 



10. A. Grundleri Grun. (1875). — Erustule rectangular, with broad, truncate ends. L. 0,o6.5 

 to 0,136; B. 0,03 to 0,05 mm. Zone with several longitudinal divisions, about 3 in 0,oi mm., 

 transversely striate; strise 9 to 10 in 0,oi mm. Median line strongly arcuate. V. linear with 

 prominent, subcapitate and incurved ends. Dorsal side with 9 to 10 indistinctly punctate striae 

 in 0,01 mm., not reaching to the median line and crossed by a narrow longitudinal band. Ventral 

 side with two rows of puncta, one along the median line and one near the ventral margin. — 

 A. S. Atl. XXVin f. 24 to 27; XXXIX f. 25. 



Marine: Gulf of Naples! Madagascar! Colombo, Ceylon (Le Tourneur Coll.), Manilla (Deby 

 Coll.)! Galapagos Islands! Campeachy Bay! Gulf of Mexico! Fossil: Hungary (Pant.). 



Var. trachytica Pant. (1889). — V. in L. 0,09 to 0,i; B, 0,oi5 mm. Strise on the dorsal 

 side reduced to two rows of puncta. — Pant. II p. 37 PL VII f. 132. 



Marine: Hungary, fossil (Pant.). 



Var. approximata Cl. — V. in L. 0,13; B. 0,oi7 mm. Dorsal strise 12inO,oi mm. Ventral 

 rows of puncta approximate to the median line. 



Marine: Island of Rhea, near Singapore (Van Heurck Coll.)! 



Var. robusta Cl. — V. in L. 0,i to 0,17; B. 0,o2 to 0,o3 mm. Striae 6 to 7 in 0,oi mm. 



Marine: Nossibe (Brun Coll.)! Macassar Straits (Grove Coll.)! Fossil: Oamaru, N. Zealand 

 (Grove CoU.)! 



11. A. prismatica Cl. N. sp. — V. elongated, with prominent, rounded and incurved ends. 

 L. 0,12 to 0,17; B. 0,018 to 0,0 2 7 mm. Dorsal side with distinct axial area and several longitu- 

 dinal blank bands. Striae not distinctly punctate, 10 to 12 in 0,oi mm. Ventral side with two 

 longitudinal rows of short striae. — PL IV f. 2(5. 



Marine: Gulf of Naples (Deby Coll.)! Oamaru, N. Zealand, fossil (Grove Coll.)! 



12. A. diaphauii Cl. N. Sp. — Frustule elliptical, with truncate ends. L. 0,o4 8; B. 0,027 

 mm. Zone complex, its divisions about 7 in 0,oi mm., striate. Striae 14 in 0,oi mm. V. with 

 strongly arcuate dorsal and straight ventral margin; ends not protracted. L. 0,048 to 0,o65; B. 0,oi 

 to 0,017 mm. Median line strongly biarcuate. No axial area on the dorsal side, where there is 

 close to the median line a strong longitudinal line. Striae 15 in 0,oi mm. finely punctate. Ventral 

 side structureless, broad, with a longitudinal line. — PL IV f. 27. 



Marine: Java! Colon (Deby Coll.)! 



13. A. truncata Gebg. (1857?) Cl. — Frustule elliptical with truncate ends. L. 0,o5 to 

 0,055; B. 0,0 2 5 to 0,0 2 8 mm. Zone with about 4 divisions in 0,oi mm., transversely striate; striae 

 22 in 0,01 mm. V. with arcuate dorsal margin and straight ventral margin. Ends not protracted. 

 Axial area moderately broad on the dorsal side. Striae 19 to 20 in 0,oi mm. Ventral side struc- 

 tureless, or with faint traces of striation. — D. of Clyde p. 515 PL XIII f. 77? Icon. n. PL III 

 f. 17, 18. 



Marine: Finmark! Sebastopol! 



"What A. truncata Gkes. may exactly denote is not possible to make out without original 

 specimens, but it is certainly a form nearly akin to A. Grevilleana. The same may be the case 

 with A. quadrata Gkbg. (D. of Clyde p. 521 PL XIII f. 85) and also with A. sulcata Br]6b. (1854). 



14. A. sulcata (Br^b. 1854)? Cl. — Frustule elliptic-rectangular, with truncate ends. 

 L. 0,053 to 0,06; B. 0,026 mm. Zone with about 3 divisions in 0,oi mm., striate; striae 15 to 16 

 in 0,0 1 mm. V. with arcuate dorsal and straight ventral margin. Axial area distinct on the dorsal 

 side of the median line. Striae 11 to 12 in 0,oi mm. Longitudinal line indistinct. Ventral side 

 structureless. Longitudinal line not distinct. — Bk^b. Notes sur quelques D. de Cherb. f. 8 (1854)? 



Marine: Balearic Islands! 



As above stated it is impossible to make out what form Brebisson denotes by the name 

 A. sulcata, for which reason 1 have adopted this name for a form, which in all points is nearly 



