122 p. T. CLEVE, SYNOPSIS OF THE NAVICULOID DIATOMS. . 



Var. tij})ica Cl. — Frustule with narrow zone, o to 4 times longer than broad. Striae on 

 the zone 15 to 17 in O.oi mm. V. in L. (),o87 to 0,13; B. 0,oo7 to 0,oi.5 mm Stri;e 11 to 12 in 

 0,0 1 mm. — A. iiutcilinta (tKEG. I), of Clyde p. olO PI. XII f. (if). 



Marine: Coasts of Sweden and Scotland! Baltjik, fossil! Labuan! Seychelles! Behring Island! 



Var. crgadcvsis Greg. (1857). — Frustule 3 to 4 times longer than broad, with narrow zone. 

 L. 0,06 to 0,089; B. 0,019 mm. Strict of tlie zone 15 in 0,oi mm. V. about 12 times longer than 

 broad; its striae. 9 in 0,oi mm. — A. ('rf/adensis Greg. D. of Clyde p. 512 PI. XII f. 71. 



Marine: Scotland (Greg.), Balearic Islands! Baltjik foss.! Macassar Straits! 



^4. maciJenfa and A. rrf/adensis are badly represented by Gregory, and their identification 

 from the figures is doubtful. From the description of the number of strife, it seems possible that 

 Gregory denotes these forms, which are nearly akin to A. acutinscula and differ from that species 

 in coarser strite and larger size only. 



14. A. Eiliiotisi Cl. (1873). — Frustule broad, with truncate ends. L. 0,o8 to 0,12; B. 0,o5 

 mm. Zone with numerous divisions, about 6 in 0,oi mm. distinctly striate; striffi 11 in 0,oi mm. 

 V. semilanceolate, with slightly rostrate ends, about (i times longer than broad. Median line close 

 to the ventral margin. Striae on the dorsal side 7,r) to 8 in 0,oi mm., distinctly pimctate; puncta 

 about 10 in 0,oi mm. Ventral side not striate. — D. of Arctic Sea p. 21 PI. Ill f. 17. Icon. n. 

 PL IV f. 2, 3. A. cymbifera Cl. Vega p. 462. A. cymh. var. A. S. Atl. XXV f. 35. 



Marine: Greenland! Spitsbergen! Bohuslan! Bab el Mandeb! Labuan! 



Var. gigantca Grun. — V. in L. 0, 1.^, ; B. 0,026 mm. Strife 7 in 0,oi mm,; puncta 6 in 

 0,0 1 mm. Ventral side with marginal puncta, 10 in 0,oi mm. — A. cymbifera var. yigantea GnuN. 

 in V. H. T. N:o 546. 



Marine: Baldjik, foss.! Sumbava (Kinker Coll.!). 



15. A. clara A. S. (1875). — V. semilanceolate with straight ventral margin and rostrate 

 ends. L. 0,io to 0,14; B. 0,o23 to 0,o2h mm. Median line straight, close to the ventral margin. 

 StrirE 5 in 0,oi mm. composed of large puncta, 5 to 6 in 0,oi mm. — Atl. XXV f. 20. 



Marine: Japan (Atl.), Macassar Straits (Grove Coll.)! 



16. A. costatsi W. Sm. (1853). — Frustule in outline broadly lanceolate, with rostrate and 

 truncate ends. L. 0,04.=^ to 0,o8; B, 0,03 to 0,o65 mm. Zone with about 3 divisions in 0,01 mm., 

 coarsely '^striate, strife 10 in 0,oi mm. V. lunate with somewhat concave ventral margin and 

 rostrate ends. Median line close to the ventral margin. Stria; on the dorsal side 9 in 0,oi mm. 

 composed of large puncta, 7 in 0,oi mm. Ventral side very narrow, with 10 strife in 0,oi mm. 

 — B. D. I p. 20 PI. XXX f. 253. Greg. D. of Clyde p. 527 PI. XIV f. 99. H. L. Smith Lens 

 II p. 83. A. inflata Grun. A. S. Atl. XXV f 29 to 30 (1875). 



Marine: North Sea! Mediterranean Sea (Perag.), Adriatic! Sumatra (Deby Coll.)! New Haven 

 (H. L. Smith), Pensacola! Colon! Campeachy Bay! Porto Seguro! Galapagos Islands! 



A. moiiiVtfcra Greg. (D. of Clyde p. 511 PI. XII f. 69) is probably a frustule of A. costata 

 or Terroris in the state of di\'ision. The same may be the case with A. monilifera in A. S. Atl. 

 XXVI f. 32. 



17. A. Teri'oris Ehb. (1853). — Frustule lanceolate with rostrate-truncate ends. L. 0,o45 

 to 0,07; B. 0,018 to 0,02 mm. Zone with about 5 divisions in O.oi mm. striate; strife 11 in 0,oi 

 mm. V. semilanceolate with rostrate-capitate ends. Strife 8 to 9 in 0,oi mm., not distinctly 

 punctate. — B. Ak. 1853. A. Ercbi Ehb. M. G. PI. XXXV A 23 f. 2 (1854). Cl. Vega p. 462. 

 A. cymbifera Greg. D. of Clyde p. 526 PI. XIV f. 97 (1857). A. S. Atl. XXVI f. 33; XXXIX 

 f. 18; XXV f. 17 to 19, 33, 34, 36. A. Lightsmithiana O'Meara M. J. XIV PI. VIII f. 8 (1874)? 



Marine: Arctic America! Greenland! Spitsbergen! Finmark! Sea of Kara! East Cape! North 

 Sea! Mediterranean Sea! Macassar Straits! Gulf of Mexico! 



