KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 26. N:0 2. 27 



12. T. cliiiiensis Cl. N. Sp. — Frustule elongated, with ronnded ends, coiistricted in the 

 middle. L. 0,i4; B. 0, 03 mm., at the constriction 0,oi8 mm. V. narrow, lanceolate, aeute, unilate- 

 rally gibbous. L. 0,i4; B. 0,02 mm. Central area transversely lanceolate. Transverse stritB 18 

 in 0,01 mm., finely pnnctate. — Pl. III f. 5, (i, 7. 



Marine: China (Deby Coll.)! 



This form, which is somewbat doubtful as a species, resembles T. Lepidoptera. 



13. T. seniistriata Grun. (1879). — V. somewbat membran aceous, elongated, rectangular, 

 sligbtly constricted. L. 0,o7.'i; B. 0, 026 mm. V. lanceolate, acute. L. 0, 09; B. 0,oi.'j mm. Keel 

 somewbat excentric. Transverse striai 19 in 0,oi mm., not reacbing the margin of the valve 

 wbere is a broad blank band. — Aniphipr. seniistriata Grun. A. M. D. N:o 196. Icon. n. P. III 

 f. 9, 10, 11. 



Brackish water: Sontb Africa! 



14. T. japonica Cl. N. Sp. — V. strongly constricted in the middle. L. 0,ii; B. 0,02 mm. 

 Wing projecting beyond the central nodule. Transverse strite 14 (wing) to Ki (keel) in 0, 01 mm., 

 not reaching the margin, where is a blank band. Longitudinal strite fine, about 30 in 0,oi mm. 



Marine: Sendai, Japan, fossil (Brun Coll.)! 



15. T. elegans W. Sm. (1856). — Frustule linear, rectangular, not constricted in the middle. 

 L. 0, 18; B. 0,04 mm. V. narrow, linear, very convex and inequilateral. L. 0,2 to 0,27; B. 0,oi3 

 mm. "Wing on the broader part. Central area small, rounded. Transverse striffi 13 to 14 in 0, 01 

 mm.; longitudinal strifie 23 in 0, 01 mm. — Amphipr. elegans W. Sm. B. D. II p. 90. Greg. D. of 

 Clyde, p. 505 Pl. XII f. 58, 58 b. V. H. Syn. p. 122 Pi. XXII f. 1, 6. 



Marine: North Sea (Coast of Sweden! England! Belgium!) Mediterranean Sea! Adriatic! 



Var. Adriatica Grun. (1880). — Frustule not constricted, narrowed towards the ends. L. 0, 17 

 to 0,30; B. 0,(135 to 0,05 mm. V. in B. 0,oi8 to 0,02 mm. Wing distinct. Central area small. 

 Transverse stricS 13,5 in 0, 01 mm. Longitudinal strise. finer but sbarp. — Amphipr. eleg. v. Adria- 

 tica Grun. A. D. p. 64. 



Marine: Adriatic (Grun.). 



Var.? Poseicitzii Pant. (1889). — L. O.ios; Height 0,0225, in the middle 0,oi75 mm. Strite 

 22,5 to 25 in 0,oi mm. punctate. — Amphipr. {elegans var.?) Posew. Pant. II, p. 56 Pl. X, f. 181. 



Marine: Hungary, fossil (Pantocsek). 



It does not appear very probable that tbis form belongs to A elegans. The figure in Pan- 

 TOCSEKs work, although not clear, seems to represent some form of. T. vitrea. 



16. T. Van Heurckii Grun. (1880). — Frustule nearly rectangular, not constricted. L. 0,o6; 

 B. 0,02 mm. On the broader side is a longitudinal band (wing?) forming a line, abruptly bent 

 at about one third of the length of the value. Strise 22 in 0, 01 mm. — Flagiotropis Van Heurckii 

 Grun. V. H. Syn. Pl. XXII bis f. 6 to 8. 



Brackish water: Belgium! 



17. T. vitrea W. Sm. (1853). — Frustule elliptical, truncate, very slightly constricted in the 

 middle. L. 0,o85 to 0,145; B. 0, 03 to 0, 04 mm. V. lanceolate, very asymmetrical. B. 0,012 to 0,oi8 

 mm. Central area indistinct. The broader side of the valve with or without a longitudinal band. 

 Transverse striae 18 in 0, 01 mm. — Amphipr. vitrea W. Sm. B. D. I, Pl. XXXI f. 270. Flagiotropis 

 vitrea Grun. A. D. p. 67. V. H. Syn., Pl. XXII f 7 to 9. Flagiotr. haltica Pfitze: Bau und 

 Entw. p. 94, 1871? Flagiotr. vitrea var. Lindigii Grun. A. D. p. 67. 



Brackish water: North Sea (coasts of Sweden! Belgium! England!) Atlantic coast of North 

 America! West Indies! California! 



Var. mediterranea Grun. (1880). — Frustule nearly rectangular, slightly constricted in the 

 middle. L. 0, 075 to 0, 15; B. 0, 015 to 0,02 mm. The broader side of the valve with a longitudinal, 

 broad, indistinctly punctate band. Transverse strife 20, longitudinal 24 in 0,oi mm. — Flagiotro- 



