. Synopsis of the naviculoid diatoms. Presented to the R. Swedish Academy of Sciences May 10, 1893. Diatoms. 72 p. T. CLKVE, SYNOPSIS OF THE NAVICULOID DIATOMS. To this genus probably belongs Stauroneis decora GtEEV. (T. Bot. Soc. of Edinb. Vol. VIII p. 236 PL III f. 11) from New Caledonia. It is very transparent, lanceolate, in length 0,i4 mm. and has a short stauros not reaching the longitudinal ridges. Scoliotropis Cl. N. G. Valve elongated symmetrical. Median line slightly sigmoid, especially towards the ends. On both sides of the median line is a longitudinal line. Structure double: coars
. Synopsis of the naviculoid diatoms. Presented to the R. Swedish Academy of Sciences May 10, 1893. Diatoms. 72 p. T. CLKVE, SYNOPSIS OF THE NAVICULOID DIATOMS. To this genus probably belongs Stauroneis decora GtEEV. (T. Bot. Soc. of Edinb. Vol. VIII p. 236 PL III f. 11) from New Caledonia. It is very transparent, lanceolate, in length 0,i4 mm. and has a short stauros not reaching the longitudinal ridges. Scoliotropis Cl. N. G. Valve elongated symmetrical. Median line slightly sigmoid, especially towards the ends. On both sides of the median line is a longitudinal line. Structure double: coarser transverse costse and finer puncta, disposed in obliquely decussating rows. Connecting zone with longitudinal rows of short striee. This genus has been formed for ScoUopleura latestriata Grun. as this form is entirely diiferent from the true Scoliopleura-forms in its structure, which is the same as in Gomphoneis, and in the complex nature of its connecting zone. Later on another, very interesting species, was discovered, unfortunately not yet found in entire specimens, S. GiUesii. The frustules of S. latestriata have along the connecting zone on each side, two chromatophore-plates, the margins of which are gently undulating. In front-view the plates have a sinus around the centra] plasma-mass. 1. S. latestriata Bk^b. (1849). — V. linear, narrowed at the cuneate ends. L. 0,i to 0,i8; B. 0,o2.'i mm. Median line strongly sigmoid. Structure: strong costse, 7 in 0,oi mm., transverse, trough- out, and minute puncta, 18 in 0,oi mm., forming obliquely de- cussating lines and alternating in double rows with the costse. Connecting zone with several longitudinal rows of short strise, about 25 in 0,01 mm. — Amphipr. latestr. Br^b. in Ktttz. Sp. Alg. p. 93. Navic. convexa W. Sm. B. D. I p. 49 PL XVI f. 136 (18,53). ScoUo- pleura latestriata V. H. Syn. p. Ill PL XVII f. 12. Marine: North Sea (Sweden! England! Belgium!), Caspian Sea (Grun.). Atlantic coasts of North America! "West
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectdiatoms, bookyear1894
