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



Var. typica Cl. — Frustule with narrow zone, 3 to 4 times longer than broad. Strise on 

 the zone 15 to 17 in 0,oi mm. V. in L. 0,os7 to 0,i3; B. 0,oo7 to 0,oi5 mm. Striee 11 to 12 in 

 0,0 1 ram. — Å. macilenta Greg. D. of Clyde p. 510 Pl. XII f. 65. 



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



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

 L. 0,06 to 0,089; B. 0,oi9 mm. Strise of the zone 15 in 0,oi mm. V. about 12 times longer than 

 broad; its stx-ige 9 in 0,oi mm. — A. ergadensis Grbg. D. of Clyde p. 512 Pl. XII f. 71. 



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



A. macilenta and A. ergadensis are badly represented by Gregory, and their identiiication 

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

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

 in coarser strise and larger size only. 



14. A. Eunotia Cl. (1873). — Frustule broad, with truncate ends. L. 0,o8 to 0,12; B. 0, 05 

 mm. Zone with numerous divisions, about 6 in 0,oi mm. distinctly striate; strise 11 in 0, 01 mm. 

 V. semilanceolate, with slightly rostrate ends, about 6 times longer than broad. Median line close 

 to the ventral margin. Strise on the dorsal side 7,5 to 8 in 0, 01 mm., distinctly punctate; puncta 

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

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



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



Var. gigantea Grdn. — V. in L. 0,15; B. 0,026 mm. Strise 7 in 0,oi mm.; puncta 6 in 

 0,01 mm. Ventral side with marginal puncta, 10 in 0,oi mm. — A- cymbifera var. gigantea Grun. 

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



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



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

 ends. L. 0, 10 to 0,14; B. 0,023 to 0,028 mm. Median line straight, close to the ventral margin. 

 Strise 5 in 0, 01 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. costata W. Sm. (1853). — Frustule in outline broadly lanceolate, with rostrate and 

 truncate ends. L. 0, 045 to O, os; B. 0, 03 to 0,065 mm. Zone with about 3 divisions in 0, 01 mm., 

 coarsely ^striate, strise 10 in 0,oi mm. V. lunate with somewhat eoneave ventral margin and 

 rostrate ends. Median line close to the ventral margin. Strise on the dorsal side 9 in 0, 01 mm. 

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

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

 II p. 83. A. infläta 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. monilifera Greg. (D. of Clyde p. 511 Pl. XII f. 69) is probably a frustule of A. costata 

 or Terroris in the state of division. The same may be the case with A. monilifera in A. S. Atl. 

 XXVI f. 32. 



17. A. Terroris Ehb. (1853). — Frustule lanceolate with rostrate-truncate ends. L. 0,04 5 

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

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

 punctate. — B. Ak. 1K53. A. Errbi Ehb. M. G. Pl. XXXV A 23 f. 2 (1854). Cl. Vega p. 462. 

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

 f. 18; XXV f. 17 to 19, 33, 34, 36. A. Lightsmithiana 0'Meara M. J. XIV Pl. VIII f. 8 (1874)? 



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

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



