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



Var. Gregorii Cl. -^ V. elliptical to subrectangular. L. 0,17; B. O.us inm. Cost?e aud longi- 

 tndinal row.s of alveoli 7 in 0,oi ram. — Nav. Smithii var. fnucu GtREG. D. of Cl3'de IX f. 15. 



Marine: North Sea! Gulf of Xaples (Deby Coll.)! 



Var. delicata A. S. (1874). — Elliptical. L. 0,i)7 to O.13; B. U,o3s to O.us mm. Cost;c 7 

 to 10 in 0,öi ram. Loiigitudinal rows of alveoli K' to 15 in 0,oi mm. — Xaf. fuaca var. ddicufa 

 A. S. N. S. D. I f. 26. Atl. VII f. 1, 7, 8. 



Marine: North Sea (A. S.), Adriatic! Sumatra! Hungary, fossil (Deby Coll.)I 



Var. tenuipnnctata Cl. — V. elliptical. L. 0,o7 to 0,i4; B. 0,032 to 0,o7 mm. Costa; 6 to 

 9 in 0,01 mm. Longitudinal rows of alveoli 12 to 18 in 0, 01 mm. — Nav. fnsca V. H. Syn. 

 Suppl. B. f. 24. 



Marine: G-nlf of Naples! Sumatra (Deby CoU)! South Sea (Van Heurck Coll.)! Mexillones 

 guano (Deby Coll.)! 



Var. Van Heurckii Cl. — V. elongated, ver}^ slightly constricted. L. 0,us; B. 0,025 mm. 

 Costte 8 in 0,oi mm. Alveoli 20 in 0, 01 mm. — Pl. I f. 19. 



Marine: South Sea (Van Heurck CoU.)! 



Var. suhfusca Pant. (1893). — Narrow elliptical. L. 0,o.-..^,; B. 0,oi7 mm. Transverse rows 

 of alveoli 5, longitudinal 7 in 0,oi mm. — Nav. .suhfusca Pant.. III Pl. XL f. 553. 



Habitat:? »Isopallaga-Serges» (Pant.). 



Var. oamaruensis Cl. — V. narrow elliptical. L. 0,i 1 ; B. 0,o3 mm. Central nodule elongated 

 rounded. Furrows very broad, about a fourth of the breadth of the valve. Costti? 8 and longitu- 

 dinal rows of puncta 16 in 0,oi mm. — Pl. II f. 3. 



Marine: New Zealand, Oamaru, fossil! 



Var. japonica Cl. — L. 0, 11; B. 0,0 5 5 mm. CostEe 6 and longitudinal rows of alveoli 13 

 in 0,01 mm. Furrows separated from the othei' parts of the valve by a row of foramina and 

 crossed by transverse single rows of large puncta. — Pl. I f. 23. 



Marine: Sendai, Japan, fossil (Tempére). 



Nav. prwflua Pant. (III Pl. XV f. 232) appears to be a form of I), fusca. 



57. D. SBStiva Donk. (1858). — V. elliptical. L. 0,037 to 0,065; B. 0,oi8 to O.oms mm. 

 Central nodule large, elongated. Furrows narrow of equal breadth throughoiit. Costte 8 to 12 in 

 0,01 mm. Alveoli of ei^ual or double number in 0,oi mm. — Nav. cestiva DoNK. T. M. S. VI p. 32 

 Pl. III f. 18. B. D. p. 6 Pl. I f. 3. A. S. Atl. VII f. 8, 10, 11; VIII f. 26, 31. 



Forma a. Costa3 and alveoli of ecjual number. 



Marine: Singapore (costfe and alveoli 9 in 0, 01 mm.), Manilla (c. a. alv. 10 in 0, 01 mm.), 

 Colon (c. a. alv. 12 in 0, 01 ram.) all in Deby Coll.! 



Forma (i. Alveoli twice as close as the costff. 



Marine: West coast of Sweden (L. 0, 04 mm. Co.stiie 12 in 0,01 mm.), Sumatra (L, 0,o6 mm. 

 Costfe 8 in 0,oi rara. Deby Coll.)! 



58. D. litoralis Donk. (1870). — V. elliptical. L. 0,027 to 0,07; B. 0,0 is to O.oas mm. 

 Central nodule small, elongated, rounded rectangular. Furrows very narrow, parallel and elose to 

 the horns. CostirB 11 (typical) to 14 in 0, 01 mm. Alveoli 'M (typical) to more in 0, 01 mm., forming 

 longitudinal rows. — Nav. litoralis Donk. B. D. p. 5 Pl. I f 2. V. H. Syn. Suppl. B. f. 25. 

 A. S. Atl. VIII f. 23 to 25. Nav. litor. var. suhtilis A. S. N. S. D. Pl. I f. 24, 25. Nav. Ovulmn 

 Grun. Verh. 1860 p. 519 Pl. III f. 19? 



Marine: Arctic America! Finmark! North Sea! Sea of Kära! Cajjc Deschnetf! Adriatic! 

 Java! Tahiti! Port Jackson! West Indies! 



Var. hospes A. S. (1875). — V. subhexagonal. L. O.os; B. 0,023 mm. Costa^ 11. alveoli 13 

 in 0,01 mm. — Nav. hospes A. S. Atl. VIII f. 32. 



Marine: Samoa (Atl.), Java! 



