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



12. T. chinensis Cl. N. Sp. — Frustule elongated, with rounded ends, constricted in the 

 middle. L. 0,i4; B. 0,();5 mm., at the constriction 0,(iik mm. V. narrow, lanceolate, acute, unilate- 

 rally gibbous. L. 0,14; B. (),o2 mm. Central area transversely lanceolate. Transverse striic 1« 

 in 0,0 1 mm., finely punctate. — PI. Ill f. 5, (i, 7. 



Marine: China (Deby Coll.)! 



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



13. T. seniistriata Grun. (1879). — V. somewhat membranaceous, elongated, rectangular, 

 slightly constricted. L. 0,o75; B. 0,o26 mm. V. lanceolate, acute. L. 0,()'j; B. 0,015 mm. Keel 

 somewhat excentric. Transverse stride 19 in 0,oi mm., not reaching the margin of the valve 

 where is a broad blank band. — Amphipr. semistriata Grun. A. M. D. N:o 196. Icon. n. P. Hi 

 f. 9, 10, 11. 



Brackish water: Soiith Africa! 



14. T. japonica Cl. N. Sp. — V. strongly constricted in the middle. L. 0, 11; B. 0,oj mm. 

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

 not reaching the margin, where is a blank band. Longitudinal stri;e fine, about ;^0 in 0,01 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. Ij. 0,2 to 0,2?; B. 0,oi:i 

 mm. Wing on the broader part. Central area small, rounded. Transverse strife 13 to 14 in (),oi 

 mm.; longitudinal stri.e 23 in 0,oi mm. — Aniphqn-. der/fnis W. Sm. B. D. II p. 90. Greg. D. of 

 Clyde, p. 505 PI. 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, i; 

 to 0,3o; B. 0,035 to 0,05 mm. V. in B. 0,oi8 to 0,o2 mm. Wing distinct. Central area small. 

 Transverse strifB 13,5 in 0,oi mm. Longitudinal strife finer but sharp. — Amphipr. eley. v. Adria- 

 tica Grun. A. D. p. 64. 



Marine: Adriatic (Grun.). 



Var.? Fosnvitzii Pant. (1889). — L. O.ios; Height 0,o225, in the middle 0,oi75 mm. Stria? 

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



Marine: Hungary, fossil (Pantocsek). 



It does not appear very probable that this 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. 0,0 2 mm. On the broader side is a longitiidinal band (wing?) forming a line, abruptly bent 

 at about one third of the length of the value. Strife 22 in 0,oi mm. — Fkujioiropis 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,i45; B. 0,o3 to 0,o4 mm. V. lanceolate, very asymmetrical. B. 0,oi2 to 0,oi8 

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

 Transverse strifje 18 in 0,oi mm. — Amphipr. vitrea W. Sm. B. D. I, PI. XXXI f. 270. Flagiotropis 

 vitrea Grun. A. D. p. 67. V. H. Syn., PI. XXII f 7 to 9. Flagiotr. haltiea Pfitze: Ban und 

 Entw. p. 94, 1871? Flagiotr. vitrea var. Lindif/ii Grun. A. D. p. 67. 



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

 America! West Indies! California! 



Var. mediterranca Grun. (1880). — Frustule nearly rectangulai', slightly constricted in the 

 middle. L. 0,o7 5 to 0, 15; B. 0,oi5 to 0,o2 mm. The broader side of the valve with a longitudinal, 

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



