124 p. T. CLEVE, SYNOPSIS OF THE NAVICULOID DIATOMS. - 



24. A. biiiotlis Greg. (1857). — Fruwtule lanceolate, truncate, constricted in the middle. 

 L. 0,044 to 0,05; B. 0,0 127 mm. Zone with numerous delicate divisions (10 in 0,oi mm.) finely 

 striate; stri?e about 28 in 0,oi mm. V. witli straight ventral margin. Median line close to the 

 ventral margin. Dorsal side with 13 not distinctly punctate stria' in 0,oi mm. Ventral side 

 with faint and closer strise; about 19 in (),oi mm. — D. of Clyde p. 510 PI. XII f. G7. 



Marine: Scotland (Greg.), Balearic Islands! 



25. A. angularis Greg. (1855). — Frustule constricted in the middle, with broad, rostrate 

 ends. L. 0,04 to 0,o6; B. 0,02 to 0,02 5 mm. Zone with about 9 divisions in 0,oi mm., very 

 finely striate. V. with slightly concave ventral margin, arcuate, and centrally sinuose dorsal 

 margins, and capitate ends. L. 0,o42; B. 0,oo8 mm. Median line close to the ventral margin. 

 Dorsal striw 9 to 10 in 0,o i mm. not distinctly punctate. — M. J. Ill p. 39 PI. IV f. 6? A. S. 

 Atl. XXV f. 83. 



Marine: Bohuslan (Atl.), Java! Maca.ssar Straits! 



Gregory's figure is scarcely sufficient for identification and Grunow believed it to represent 

 a form of A. coff'ceiforniis, but it has much coarser strise. 



26. A. Peragalli Cl. N. Sp. — Frustule elongated, slightly constricted in the middle, with 

 truncate ends. Ij. 0,o55 to 0,o65; B. 0,o22 to 0,o25 mm. Zone very dissimilar on the dorsal and 

 ventral side; on the dorsal side with about 5 longitudinal costcB in 0,oi mm. connected by trans- 

 verse costfB, 4 to 5 in 0,oi mm.; on the ventral side with about 12 longitudinal ribs in 0,oi mm. 

 and trans\ersely striate, strise 24 in 0,oi mm. V. with the median line close to the ventral 

 margin. Its strife 11 in 0,oi mm. not distinctly punctate. — Amphora sp. n.'^ Perag. D. de Ville- 

 franche p. 40 PL III f. 26 (1888). 



Marine: Mediterranean. Balearic Islands! Villefranche (Per.), Adriatic, Rovigno! 



The figure given by Pera(MLLO does not exactly correspond with our species, as it has 

 closer (15 in 0,oi mm.), and distinctly punctate, strise; nevertheless I have no doubt about the 

 identity. 



27. A. czekehazeiisis Pant. (1889). — V with arcuate dorsal and straight ventral margin. 

 Ends rostrate. L. 0,ti(; to n,(i(;2.T; B. O.oi to ().(iio.5 mm. Median line closely approximate to the 

 ventral margin. Stria^ 20 in 0,oi mm. not distinctly punctate, but crossed by numerous, undulating- 

 blank bands. — Pant. II p. 36 PI. I f. 6. 



Brackish water: Czekehaza, Hungary, fossil! 



28. A. iiitersecta A. S. (1875). — Frustule linear, with truncate ends. L. 0,i6; B. 0,o4 

 mm. Zone with about 4 to 5 divisions in (),oi mm., striate; strife 18 in 0,oi mm. V. about 7 

 times h)nger than broad, witli slightly ai'cuate dorsal margin, straight ventral margin, and capitate 

 ends. L. 0, ii to 0, 14; B. 0,02 mm. Median line near the ventral margin. Axial area distinct on 

 the dorsal side. Dorsal side witli 8 strifu in 0,oi mm. Strife obscurely punctate and crossed by 

 two or three longitudinal blank bands. Ventral side narrow, with .short marginal strifie, about 

 11 in 0,01 mm. — Atl. XXV f. 37, 38. Pant. Ill PI. XII f. 19<). 



Marine: Baltjik, foss.! Bory, Hungary, fossil! 



Var. sarmatica Pant. (1886). — Strise strongly punctate. — Pant. I p. 21 PI. XV f. 135. 

 Marine: Dolje, Hungary fossil (Pant.). 



Var.? striata Pant. (1886). — L. 0,095; B. 0,oi5 ram. Strife 10 in 0,oi mm. composed of 4 

 distant puncta. — Pant. I p. 22 PI. XVII f. 156. 

 Marine: Dolje, Hungary, fossil (Pant.). 



