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



Var. Gregorii Cl. - V. elliptical to subrectangular. L. 0,i7; B. 0,08 mm. Costtp and longi- 

 tudinal rows of alveoli 7 in U,oi mm. — New. Smithii var. fiisca Greg. I), of Clyde IX f. 15. 



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



Var. delicata A. S. (1874). — Elliptical. L. (),(i7 to 0,1.3; B. 0,(1.38 to 0,o8 mm. Costpe 7 

 to 10 in 0,01 mm. Longitudinal rows of alveoli 10 to 15 in 0,oi mm. — Nar. fu-sca var. dclicafa 

 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. tcniiiputidata Cl. — V. elliptical. L. 0,07 to 0,i4; B. 0,032 to 0,o7 mm. Costte 6 to 

 9 in 0,01 mm. Longitudinal rows of alveoli 12 to 18 in 0,01 mm. — Nac. 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. 

 CostcB 8 in 0,01 mm. Alveoli 20 in 0,oi mm. — PI. I f. 10. 



Marine: South Sea (Van Heurck Coll.)! 



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

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



Habitat:? >Jsopallaga-Serges ' (Pant.). 



Var. oamaruensis Cl. — V. narrow elliptical. L. 0,i 1 ; 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. 0,055 mm. Co.stie 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. — PI. I f. 23. 



Marine: Sendai, Japan, fossil (Tempere). 



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



57. D. *stiva- Donk. (1858). — V. elliptical. L. 0,037 to 0,ofi5; B. 0,oi8 to 0,038 mm. 

 Central nodule large, elongated. Furrows narrow of equal breadth throughout. Costte 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 

 PI. Ill f. 18. B. D. p. 6 PL I f. 3. A. S. Atl. VII f. 8, 10, 11; VIII f. 2i^, 31. 



Forma a. Costa? and alveoli of equal number. 



Marine: Singapore (costee and alveoli 9 in 0,o 1 mm.), Manilla (c. a. alv. 10 in 0,i)i mm.), 

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



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



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

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



58. D. litonilis 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. Costte 11 (typical) to 14 in 0,oi mm. Alveoli 22 (typical) to more in 0,oi mm., forming 

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

 A. S. Atl. VIII f. 23 to 25. Nav. litor. var. subtilis A. S. N. S. D. PI. I f. 24, 25. Nav. Ovnlnm 

 Grun. Verh. 1860 p. 519 PL III 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. Costa^ 11, alveoli 13 

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



Marine: Samoa (Atl.), Java! 



