106 P. T. CLEVE, SYNOPSIS OF THE NAVICULOID DIATOMS. 



No axial nor central area on the dorsal side. Longitndinal liiie closely approximate to the median 

 ]ine. Dorsal strise 6 to 7 in 0,oi mm. coarsely punctate; puncta 7 in 0,oi mm. Ventral side with 

 a row of short striee along the median line and towards the ends of the valve. Ventral striee 

 frequently crossed by a longitudinal line. — A. S. Atl. XXVII f. 46. Ä. gigantea var. andesitica 

 Pant. II p. 36; III Pl. XVII f. 243. 



Marine: Gulf of Naples! Java! Japan! S:n Pedro Calif., fossil (Kinker), Campeachy Bay! 

 Pensacola! Colon (Deby CoU.)! Hungary, Bory fossil (Pant.)? 



Var. oiscura Cl. — V. in L. O, lo to 0, 20, in B. 0,oi5 to 0, 04 mm. Striee on the dorsal 

 side 6 to 7 in 0, 01 mm.; puncta coarse, about 5 in 0, 01 mm. forming longitudinal undnlating lines. 

 Ventral side with a row of short, radiate striaj along the whole median line. — A. S. Atl. Pl. 

 XXVIII f. 20 (without name). Icou. n. Pl. IV f. 28, 29. 



Marine: Balearic Islands! Grulf of Naples (Deby CoU.)! Sumbava (Kinker CoU.)! Sumatra 

 (Deby Coll.)! Macassar Straits! Campeachy Bay (Atl.). 



Forma minor. Strise 8 in 0, 01 mm. L. 0, 11 mm. ■ — A. S. Atl. XL f. 28, 29. 



Marine: S:t Peter, Hungary (fossil)! Leton Bank (Atl.). 



Var. fusca A. S. (1875). — V. in L. 0, 07 to 0, 12 ram. Dorsal stritE 10 in 0, 01 mm. coarsely 

 punctate; puncta 8 in 0, 01 mm. Longitudinal line somewhat obscure. Ventral part broad, struc- 

 tureless, except at the ends, where are short sets of oblique, granulate strice. Zone with irregu- 

 lar small puncta, giving it a brownish colonr. — A. fusca A. S. Atl. XXVII f. 68. 



Marine: GiUf of Naples! Red Sea (Van Heurck CoU.)! Java! Labuan! Macassar Straits! 

 Gulf of Mexico (Atl.), Bahia! Gralapagos Islands! 



16. A. nodoSii Brun. (1891). — V. with strongly arcuate dorsal margin, straight ventral 

 margin and broad, rounded ends. L. 0, 12 to 0, 15; B. 0, 042 mm. Median line slightly biarcuate. 

 Dorsal side without axial and central areas, divided into two parts by a longitudinal line (or 

 crest), of which the interiör bears short rows of large puncta, and the exteriör strong costae (4 in 

 0,01 mm.) alternating with rows of large ocelli (4 to 5 in 0, 01 mm.), which form longitudijial, 

 slightly iindulating lines. Ventral side of the valve narrow, with short and strong costfe. — 

 D. espéces nouv. p. 9 Pl. XII f. 2. 



Marine: Nossibé (Brun CoU.)! Japan (Brun), Samoa! Macassar Straits! 



One of the largest and stoutest forms of Amphora. The strong central nodiile, the crest 

 enclosing, on the dorsal side of the valve, a furrow, recal Diploneis, as does also the structure ot 

 transverse costse, alternating with ocelli. 



17. A. Oculus A. S. (1875). — V. liinate, with obtuse ends. L. 0,07 to 0,1.5; 0, 02 to 0,o4 

 mm. Median line approximate to the ventral margin, straight or slightly biarcuate. Axial area 

 indistinct; central area large, rounded. Longitudinal line at a considerable distance from the 

 median line. Strite on the dorsal side 7 to 10 in 0, 01 mm., coarsely punctate; piincta about 8 in 

 0,01 mm. Ventral side narrow, with coarse strise in its whole length. — Atl. XXVII f. 52. A. 

 Oc. var. fossilis Pant. I p. 22 Pl. XIV f. 127. A. Wachenhuscnii Janisch A. S. Atl. XL f. 38 (1876). 



Marine: Grulf of Naples (Deby, Brun CoU.)! Seychelles (Van Heurck CoU.)! Sumbava (Kinker 

 CoU.)! China (Deby CoU.)! Japan (Atl.), Campeachy Bay (Atl.). 



Var. Farcuiien A. S. (1875). — L. 0,0(5 to 0,o7; B. 0,019 mm. Central area less distinct. 

 Stiiii' 11 in 0,01 mm.; puncta 10 in 0,oi ram. — A. Farc. A. S. Atl. XXVIl f. 56, 57. 



Marine: Seychelles (Van Heurck CoU.)! Samoa (Atl.), Galapagos Islands! Campeachy Bay (Atl.). 



18. A. Schniidtiä CtRUN. (1875). — Frustule in outline elliptical with truncate ends- 

 L. 0,0»; B. 0,04 mm. Mi-dian line elevated to a biarcuate keel. Dorsal side with coarsely punctate 

 stricD, 9 in 0,oi mm. reacliiug to the median line. Ventral side also with coarsely punctate striie. 

 Zone with two or iiiore longitudinal rows of large puncta. — A. S. Atl. XXVIII f. 2. 



Marine: Cliina! Satima (Atl.), Bahia, Rio .laneiro, Porto Segiiro (Deby (-oll.)! 



