KONGL. SV. VET. AKADEMIENS HANDLINGAR. 15AND 26. N:0 2. 31 



Marine: Mediterranean Sea, Alexandria (Deby Coll.)! Levant (Grove (Joll.)! Delaware (Lewis) 

 Florida! West Indies! Colon! (Tiilf of Mexico! -Java (Atl.) Fossil S;«akal, S:t Peter, Hungary 

 (Pantocsek). 



Var. Janischii Castr. (1M8(5). — Segments elliptic-lanceolate, obtuse. L. 0,i; B. U,()2r> to 

 0,03, at the constriction 0,oi5 mm. Marginal cellules 4 to 4, 5 in 0,oi mm. Cellules of the valve 

 10 to 11 in 0,0 1 mm. Transverse stria' 26 to 27 in 0,oi mm. — Navic. Jan. Castr. D. Voyage 

 Challenger p. 29 PI. XXX f. o. Mastoglnia reticulata var. japonica Brun. D. fossiles du .lapon 

 p. 72; 1889. Dictyonei^ marginata A. S. Atl. CLX f. 17, 18, 19, 21. D. marq. v. Jan. A. S. Atl. 

 CLXXXVIII f. 50. 



Marine: Madagascar (Brun Coll.)! Cebu! Java (Atl.), Japan (Atl.), Samoa (Atl.). Galapagos 

 Islands! Bermudas (Castr.) Florida! Campeachy Bay! Colon (Deby Coll.)! Oaniaru fossil, (Atl.) 



Var. Clevei Brun. (1889). — Segments broad, elliptical, with rounded ends. L. 0, ii to0,i2.'); 

 B. 0,04 2, at the constriction 0,oi3 mm. Marginal cellules 3 to 4 in 0,oi mm. — Mastogloia Clevei 

 Brun a. Temp. D. foss du Japon p. 39 PI. IX f. 18. D. margin, v. Clevei A. S. Atl. CLXXXVIII, 46. 



Marine: Java! Japan fossil and living, (Brun). 



Var. intermedia Cl. — Segments narrow, elliptical. L. 0,12; B, 0,03, at the constriction 

 0,014 mm. Marginal celhiles 4 in 0,01 mm. Cellules of the valve 10 in 0,oi mm. Transverse 

 striae 24 in 0,oi mm. — Mastogloia Clevei Brun. A. S. Atl. PI. CLX f. 34, 35. 



Marine: Nossi Be (Brun Coll.)! Japan (Atl.). 



Var. commutnta Cl. — V. about 6 times longer than broad, gently constricted in the middle. 

 Segments narrow, elliptical to elliptic-lanceolate. Ends obtuse. L. 0,n to 0,12; B. 0,02i to 0,025, 

 at the constriction 0,oi to 0,12 mm. Marginal cellules 5 to 6 in 0,oi mm. Cellules of the valve 

 12 in 0,01 mm. Transverse strife 25 in 0,oi mm. — Dictyoneis marginata f. elongata A. S. Atl. 

 CLX f. 30. 



Marine: Manila (Deby Coll.)! Macassar Straits (Grove Coll.)! Sumbava (Kinker Coll.)! Cam- 

 peachy Bay! Rio Janeiro (Deby Coll.)! 



Var. gigantea Cl. — V. as in the Var. commutata. L. 0,i8; B. 0,o4 4, at the constriction 

 0,022 mm. Marginal cellules 4 in 0,oi mm. Cellules of the valve 9 in 0,oi mm. 



Marine: Oamaru, New Zealand, fossil (Grove Coll.)! 



Var. spectatissima Grev. (1866). — V. strongly constricted, with cuneate. obtuse segments. 

 L. 0,09 to 0,13; B. 0,03, at the constriction 0,oi3 mm. Marginal cellules broad, 4 in 0,oi mm. 

 Cellules of the valve coarse, 8 in 0,01 mm. Transverse striit 23 in 0,oi mm. — ■ Navic. spectatis.sima 

 Grev. T. M. S. Vol. XIV p. 84 PI. IX f. 29. Dictyoneis spect. A. S. Atl. CLX f. 24 to 26, 32. 



Marine: Zanzibar (Grev.) Seychelles (Van Heui-cks Coll.)! Campeachy Bay (Atl.), Campeachy 

 Bank (Atl.). 



4. D. Thiimii Cl. (1890). — V. linear-lanceolate, with obtuse ends. L. 0,ii to 0,i 5; B. 0,022 

 to 0,032 mm. Terminal fissures in contrary directions. Marginal cellules 4 to 5 in 0,01 mm., of 

 equal size. Cellules of the valve about 11 in 0,oi mm. Transverse strije 24 to 25 in 0,oi mm. — 

 Cl. Diatomiste I p. 15. Icon. n. PI. V f. 33. A. S. Atl. CLXXXVIII f. 44, 45. 



Marine: Red Sea (Atl.) Seychelles (Van Heurck Coll.)! Java! Cebu! China! Brazil. (Atl.). 



D. Thnmii is nearly akin to D. marginata var. commutata. The fig. 31 PI. CLX and fig 

 49 PI. CLXXXVIII in A. S. Atl. seem to represent intermediate forms, as also Pscudodictyoncis 

 hungarica Pant. Ill PI. I f. 8. 



5. D. subcoiistricta Cl. N. Sp. — V. slightly constricted, with broad, elliptic-lanceolate 

 segments. L. O,or)r) to 0,083; B. 0,024 to 0,o3, at the constriction 0,oih mm. Marginal cellules 4 

 in 0,01 mm. Cellules of the valve 9 in 0,oi mm. Transverse stri.e 23 in 0,oi nun. — PI. V f . 31. 



Marine: Madagascar! Cebu! Campeachy Bay! 



This form is nearly akin to D. marginata var. Janischii and is perhaps more correctly to 

 be appreciated as a less constricted form of this variety. 



