112 T". T. CLEVK, SYNOPSIS OP^ THE NAVIOULOll) DIA'IOMS, , 



10. A. Griiudleri Grun. (1875). — Frnstule rectangular, witli broad, tnmeate ends. ]j. (),o6!i 

 to 0,136; B. 0,03 to OiO-fi mm. Zone witli several longitudinal divisions, about 3 in 0,(m mm., 

 transversely striate; strite 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 iiulistinctly punctate stria; 

 in 0,0 1 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. XXVIII f. 24 to 27; XXXIX f. 25. 



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

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



Var. fraehytica Pant. (1889). — V. in L. 0,o9 to 0,i; B, 0,oi.t mm. Strite on the dorsal 

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



Marine: Hungary, fossil (Pant.). 



Var. approximata Cl. — V. in L. 0, 13; B. 0,oi7 mm. Dorsal strite 12 in 0,u 1 mm. Ventral 

 rows of puncta approximate to the median line. 



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



Var. rolmsta Cl. — V. in L. 0,i to 0,17; B. 0,o2 to 0,o3 mm. Strife G to 7 in O.oi mm. 



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

 (Grove Coll.)! 



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

 L. 0,12 to 0,17; B. 0,018 to 0,027 mm. Dorsal side with distinct axial area and several longitu- 

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

 longitudinal rows of short stria'. — PI. IV f. 2(i. 



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



12. A. diaphiiiiii Cl. N. Sp. — Frustule elliptical, with truncate ends. L. 0,04 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 to0,o6.5; B. 0,oi 

 to 0,0 17 mm. Median line strongly biarcuate. No axial area on the dorsal side, where there is 

 close to the median line a strong longitudinal line. Stride 15 inO,oi mm. finely punctate. Ventral 

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



Marine: Java! Colon (Deby Coll.)! 



13. A. truiicata Greg. (1857?) Cl. — Frustule elliptical with truncate ends. L. 0,0.'-. to 

 0,0.^).'-); B. 0,o2.''> to 0,028 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. Strife 19 to 20 in 0,oi mm. Ventral side struc- 

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

 f. 17, 18. 



Marine: Finmark! Sebastopol ! 



What A. truncata Gkeg. 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. (/Hudrafa Greg. (D. of Clyde p. 521 PI. XIII f. 85) and also with A. sidcata Bri^b. (1854). 



14. A. sulcata (Breb. 1854)? Cl. — Frustule elliptie-rectangular, with truncate ends. 

 L. 0,().'^>:i to (),()(;; B. 0,o2G mm. Zone with about 3 divisions in 0,oi mm., striate; striai 15 to 16 

 in 0,01 mm. V. with arcuate dorsal and straight ventral margin. Axial area distinct on the dorsal 

 side of the median line. Stria; 11 to 12 in 0,o 1 mm. Longitudinal line indistinct. Ventral side 

 structureless. Longitndinal line not distinct. — Br^b. Notes sur quekpies D. de (.-herb. f. 8 (1854)? 



Marine: Balearic Islands! 



As above stated it is impossible to make out what form Brehisson denotes b}' the name 

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



