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



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

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

 rally gibbous. L. 0,14; B. 0,02 mm. Central area transversely lanceolate. Transverse striae 18 

 in 0,01 mm., finely punctate. — PL III f. 5, 6, 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. 0,075; B. 0,026 mm. V. lanceolate, acute. L. 0,09; B. O.ois mm. Keel 

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

 where is a broad blank band. — Amphij^r. semistriata Gkun. A. M. D. N:o 196. Icon. n. P. Ill 

 f. 9, 10, 11. 



Brackish water: South Africa! 



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

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

 not reaching the margin, where is a blank band. Longitudinal strise 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 striae 13 to 14 in 0,oi 

 mm.; longitudinal strise 23 in 0,oi mm. — Amphipr. elegans W. Sm. B. D. II p. 90. Grek. 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,i7 

 to 0,30; B. 0,035 to 0,05 mm. V. in B. 0,oi8 to 0,02 mm. Wing distinct. Central area small. 

 Transverse striae 13,5 in 0,oi mm. Longitudinal strise finer but sharp. — 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. Strise 

 22,5 to 25 in 0,oi mm. punctate. — Amphipr. (elegans var.?) Poseiv. Pant. II, p. 56 PL 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. 0,02 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. Striae 22 in 0,oi 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. 0,085 to 0,i45; B. 0,03 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 striae 18 in 0,oi 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. ialtica 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,o75 to 0,15; B. 0,oi5 to 0,02 mm. The broader side of the valve with a longitudinal, 

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



