KONGL. SV. VKT. AKADEMIENS HANDLINGAR. 



BAND 



27. 



N:<) 



3. 



121 



Var. horealis Ktixz (1844). -- L. 0,0 m to 0,025 111111. Striiu 21 to 21 in 0,oi nun. — A. ho- 

 realis KiiTZ Bae. p. lOK PI. Ill f. 18. V. H. Syii. Tl. 1 f. 20. A. salina [i minor \ . H. Syn. p. 57. 



Fresh or brackish water: Helgoland (Kiitz), Gulf of Bothnia! 



Var. fossilis Pant. (1889). — L. 0,o;52 mm. Stria; 22, .'i in 0,oi mm. — A. salina var. fossilis 

 Pant. II p. 39 PI. Ill f. 47. 



Brackish water: Hungary, fossil (Pant.). 



Var. angnlaris V. H. (1880). — Frustule in L. 0,025 to 0,04:5; B. 0,oi to 0,oi5 mm. slightly 

 constricted in the middle. Stria; 20 to 23 (18 according to Van Heurck) in O.oi mm. Divisions 

 of the zone about 14 in 0,oi mm., distinctly striate, - A. anf/ularis V. H. Syn. p. 57 PI. I f. 21. 

 A. aiigulosa var. Ji/rafa V. H. Syn. f. 22. A. hyhrida Grun. V. H. Syn. p. 57 V. H. T. N:o 12. 

 A. hitllnsa var. linrolata H. L. Smith T. N:o (ill. 



Marine: England! Belgium! 



Var. hungarica Cl. — V. in length 0,044; B. 0,oi. Ventral margin straight. Striae 20 in 

 0,01 mm. — A. acutiuscida var. fos.silis Pant. II p. 35 PI. II f. 29. 



Brackish water: Hungary, fos.sil (Pant.). 



Var. protrada Pant. (1889). — L. of V. 0,08; B. 0,007 mm. Ventral margin convex. Ends 

 protracted, capitate. Strife distinctly punctate 17,5 to 19 in 0,oi mm. — A. protract u Pant. II 

 p. 39 PI. I f. 5. 



Brackish water: Hungary, fossil (Pant.). 



12. A. acutiu8Cula Kutz (1844). — Frustule elliptic-lanceolate, with subrostrate and trun- 

 cate ends. L. 0,035 to 0,o7; B. 0,oi9 mm. Zone with numerous divisions, about 11 in 0,oi mm., 

 transversely striate; stritB 18 to 20 in 0,oi mm. V. narrow, 10 to 12 times as long as broad, 

 with subcapitate ends and straight ventral margin. Median line close to the ventral margin. 

 Stria; 13 to 18 in 0,oi mm. finely, but distinctly punctate. — Bac. p. 108 PI. V f. 32. V. H. 

 Syn. p. 57 PI. I f. 18. A. lineata Greg. Diat. of Clyde p. 512 PI. XII f. 70 (1857) A. S. Atl. 

 XXVI f. 59. A. coff'teiformis var. Salinaruni Grun. Foss. D. Osterr. Ung. p. 148 (1882). A. striata 

 Pant. II p. 39 PI. II f. 31 (1889)? A. striolata Pant. II p. 39 PI. II f. 25 (1889)? .4. juvenalis 

 Pant. Ill PI. XIII f. 199 (1893). 



BrackLsh and marine: Greenland! Spitsbergen! Finmark! Sea of Kai^a! Baltic! North Sea! 

 Morocco! Balearic Islands! Caspian Sea (Grun.), Hungary, fossil Czekehaza! Cape May! Samoa! 



Var.? suhconstricta Grun. (1878). — Frustule slightly constricted in the middle. L. 0,035 

 to 0,045; B. 0,011 to 0,012 mm Strife 15 to 17 in 0,oi mm., on the zone fine. — Casp. Sea Alg. 

 p. 8 PI. Ill f. 5. 



Brackish water: Caspian Sea (Grun.), N. Wales. 



Var.? constrida Grun. (1878). — Larger than the var. s^ilicoustrida. Strite 12 to 14 in 

 0,01 mm. — Casp. Sea Alg. p. 8. 



Marine: Tahiti, Tonga Islands, Samoa (Grun.), Seychelles (Van Heurck Coll.!) 



A. actitiuscnla diff'ers from A. coff'ceiformis in its larger size, coarser stria;, and distinctly 

 striate zone, but all these characteristics are variable, and in fact both species are connected by 

 intermediate forms, as is also the case with A. macilenta Greg. 



Pantocsek has described under the name A. Locsyi (II p. 37 PI. V f. 93) a form that seems 

 to belong to A. acutiuscula, but the description does not agree with the figure, as the stria; are 

 according to the description 11 in 0,oi mm. and on the fig. 14 to 15 in 0,oi mm. The variety 

 suhcoti.stricta may be identical with A. angnlaris and the var. constrida with A. hinodis. 



13. A. macilenta Greg. (1857). — Frustule in outline lanceolate, with truncate ends. 

 L. 0,o.i7 to 0,12 mm. Zone with numerous divisions, 7 to 8 in 0,oi mm., transversely striate; 

 stria; 11 to 15 in 0,oi mm. V. semilanceolate with rostrate-capitate ends. Median line close to 

 the ventral margin. Stria; 9 to 12 in 0,oi mm., obscurely punctate. 



K. Sv. Vet. Akad. Handl. Haud 27. N:o 3. IG 



