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



Var. Gregorii Cl. -- V. elliptical to subrectangular. L. 0,17; B. 0,o8 mm. Costffi and longi- 

 tudinal rows of alveoli 7 in 0,oi mm. — Nav. Smithii var. fusca Greg. D. of Clyde IX f. 15. 



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



Var. delicata A. S. (1874). — Elliptical. L. 0,o7 to 0,13; B. 0,038 to 0,o8 mm. Costse 7 

 to 10 in 0,01 mm. Longitudinal rows of alveoli 10 to 15 in 0,oi mm. — Nav. fusca var. delicata 

 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.)! 



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

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

 Suppl. B. f. 24. 



Marine: Gulf of Naples! Sumatra (Deby Coll)! South Sea (Van Heurck Coll.)! Mexillones 

 guano (Deby Coll.)! 



Var. Van Heurckii Cl. — V. elongated, very slightly constricted. L. 0,o8; B. 0,025 mm. 

 Costse 8 in 0,oi mm. Alveoli 20 in 0,oi mm. — PI. I f. 19. 



Marine: South Sea (Van Heurck Coll.)! 



Var. subfusca Pant. (1893). — Narrow elliptical. L. 0,0.15; B. 0,oi7 mm. Transverse rows 

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



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



Var. oamaruensis Cl. — V. narrow elliptical. L. 0,ii ; B. 0,03 mm. Central nodule elongated 

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

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



Marine: New Zealand, Oamaru, fossil! 



Var. japonica Cl. — L. 0, 11; B. 0,05 5 mm. Costse 6 and longitudinal rows of alveoli 13 

 in 0,01 mm. Furrows separated from the other 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 (Tempere). 



Nav. prceflua Pant. (Ill PL XV f. 232) appears to be a form of D. fusca. 



57. D. aestiva Donk. (1858). — V. elliptical. L. 0,037 to 0,065; B. 0,oi8 to 0,038 mm. 

 Central nodule large, elongated. Furrows narrow of equal breadth throughout. Costse 8 to 12 in 

 0,01 mm. Alveoli of equal 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. VH f. 8, 10, 11; VIII f. 26, 31. 



Forma a. Costse and alveoli of equal number. 



Marine: Singapore (costse and alveoli 9 in 0,ai mm.), Manilla (c. a. alv. 10 in 0,oi mm.). 

 Colon (c. a. alv. 12 in 0,oi mm.) all in Deby Coll.! 



Forma /S. Alveoli twice as close as the costse. 



Marine: West coast of Sweden (L. 0,04 mm. Costse 12 in 0,oi mm.), Sumatra (L, 0,06 mm. 

 Costse 8 in 0,oi mm. Deby Coll.)! 



58. D. litoralis Donk. (1870). — V. elliptical. L. 0,027 to 0,07; B. 0,015 to 0,033 mm. 

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

 the horns. Costse 11 (typical) to 14 in 0,oi mm. Alveoli 22 (typical) to more in 0,oi 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. liter, var. subtilis A. S. N. S. D. PL I f. 24, 25. Nav. Ovulum 

 Grun. Verb. 1860 p. 519 PL HI f. 19? 



Marine: Arctic America! Finmark! North Sea! Sea of Kara! Cape Deschneff! Adriatic! 

 Java! Tahiti! Port Jackson! "West Indies! 



Var. hospes A. S. (1875). — V. subhexagonal. L. 0,05; B. 0,023 mm. Costse 11, alveoli 13 

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



Marine: Samoa (Atl.), Java! 



