. Synopsis of the naviculoid diatoms. Presented to the R. Swedish Academy of Sciences May 10, 1893. Diatoms. KONGL. SV. VET. AKADEMIENS HANDLINGAR. BANT) 26. n:o 71 {V. very convex . . V. less convex . . I Striae coarsely punctate \ ^ finely — P. crucifix Bk. a. Temp. ... 4. . P. jugata Cl. P. stauroptera Bail. 1. P. impleta Cl. a. Grove (1891). — V. elliptic-lanceolate. L. 0,i3; B. 0,038 mm. Median line with very approximate central pores and indistinct terminal fissures. Stauros narrow dilated at the extremities. Strise 12 in 0,oi mm., radiate throughout, finely lineate. Longitudinal lines 3
. Synopsis of the naviculoid diatoms. Presented to the R. Swedish Academy of Sciences May 10, 1893. Diatoms. KONGL. SV. VET. AKADEMIENS HANDLINGAR. BANT) 26. n:o 71 {V. very convex . . V. less convex . . I Striae coarsely punctate \ ^ finely — P. crucifix Bk. a. Temp. ... 4. . P. jugata Cl. P. stauroptera Bail. 1. P. impleta Cl. a. Grove (1891). — V. elliptic-lanceolate. L. 0,i3; B. 0,038 mm. Median line with very approximate central pores and indistinct terminal fissures. Stauros narrow dilated at the extremities. Strise 12 in 0,oi mm., radiate throughout, finely lineate. Longitudinal lines 3 to 4 on each half of the valve, the most distinct connecting the ends of the stauros with the ends of the valve. — Nav. impl. Cl. a. GtROVB. Diatomiste I, p. 58 PL IX fig. 1. Marine: Macassar Straits! 2. P. polygona Brun (1891). — V. broad with slightly convex margins and cuneate, obtuse, ends. L. 0,i2 to 0,i5; B. 0,035 to 0,05 mm. Median line with small terminal fissures, turned in the same direction, and not very approximate central pores. Stauros moderately broad. Striae slightly radiate throughout, 16 in 0,oi mm., punctate, puncta 21 in 0,oi mm. Longitudinal lines not very distinct. — Nav. pol. Brun. D. Esp. n. p. 38 PL XV f. 9. Marine: Japan, fossil! The longitudinal lines are not so distinct as on the other species. In their place is a kind af low crest sepa- rating the interior part of the valve from the exterior steeply sloping part. 3. P. stauroptera Bail. (1854). — V. elliptic-lanceo- late, with obtuse ends. L, 0,ii to 0,i3; B. 0,o3 to 0,o35 mm. Stauros moderately broad. Striae 14 to 18 in 0,oi mm., finely punctate, parallel. Longitudinal lines distinct, median. — Amphora stauroptera Bail. Smiths. Contr. VII p. 8 f. 14, 15 (1854). Amphiprora lepidoptera GtReg. D. of Clyde p. 506 PL XII f. 59 c (1857). Amphiprora ohsusa Greg. D. of Clyde 1. c. fig. 60. A. S. N. S. D. Ill f. 1. Nav. arctica Cl. D. arct. S. p. 16 PL III f. 13 (1873). Lagerst. Boh. D. p. 46
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectdiatoms, bookyear1894
