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



large, roimded. Strise 14 to 15 in 0,oi mm., closer (about 18 in G,oi mm.) near the ends, radiate 

 at the ends, coarsely punctate; puncta about 11 in 0,oi mm. forming undulating, longitudinal rows. 

 Median strise alternately longer and shorter. — Diatomiste Vol. II p. 13 PI. I f. 7, 8. 

 Brackish water: Mouth of Delaware (Grrun.) Connecticut! 



11. N. Febigerii Cl. (1881). — V. lanceolate, with obtuse ends. L. 0,o54 to 0,o6; B. 0,o2 

 mm. Axial area indistinct; central area large and irregular. Striae 14 to 16 in 0,oi mm., not 

 closer near the ends, strongly radiate, parallel at the ends, composed of large puncta, about 14 in 

 0,01 mm. Median strise of unequal length. — N. R. D. p. 9 PI. II f. 21. 



Marine: California! Japan! 



N. Febigeri resembles the lower valve of Achnanthes danica, but it is a true Navicula, both 

 valves being similar. 



12. N. Neumayeri Pant. (1893). — V. lanceolate, subobtuse. L. 0,056; B. 0,022 mm. Axial 

 area very narrow; central area small, rounded. Strise 10inO,oi mm. radiate throughout, punctate; 

 puncta 10 in 0,oi mm. Among the median striae a few shorter are intercalated. — Pant. Ill 

 PI." IV f. 64. 



Marine: Bory, Hungary, fossir (Pant.). 



13. N. Zeta Cl. N. Sp. — V. lanceolate, with obtuse ends. L. 0,065; B. 0,022 mm. Median 

 line with short terminal fissuses, turned in the same direction. Axial area narrow. Central area 

 orbicular, bordered by somewhat elongated puncta. Strise 17 (middle) to 21 (ends) in 0,oi mm., 

 radiate, parallel at the ends, coarsely punctate, puncta about 17 in 0,oi mm., forming undulating 

 longitudinal rows. A few of the median strise shorter than the others. 



Brackish water: Barbados (Weissflog Coll.)! 



Var. mexicana Cl. — V. with broader ends. L. 0,o6; B. 0,oi9 mm. Strise 15 (middle) to 

 20 (ends) in 0,oi mm. The median strise not alternating with shorter striae. Central area with 

 blank spaces on both sides of the rows of elongated puncta. 



Brackish water: Mexico (Weissflog Coll.)! 



14. N. My Cl. N. Sp. — V. lanceolate, gradually tapering from the middle to the rounded 

 and obtuse ends. L. 0,ii; B. 0,024 mm. Axial area narrow; central area small, elongated. Striae 

 14 (middle) to 20 (ends) in 0,oi mm. radiate at the ends and gently curved, punctate, puncta 

 about 16 in O.oi mm. Median strise of unequal length. — PI. I f. 17. 



Marine: China (Deby and Van Heurck Coll.)! 



In outline and striation this species has some resemblance to N. bottnica, but it is much 

 larger, has more distant puncta and the terminal strise are radiate. 



15. N. inaeandrina Cl. (1893). — V. elliptical, with rounded ends. L. 0,o4 5 to 0,06 5; 

 B. 0,021 to 0,031 mm. Axial area narrow. Central area orbicular, moderately large. Strise 19 

 to 21 in 0,01 mm., radiate throughout, composed of elongated puncta, forming undulating, longi- 

 tudinal rows, about 9 to 10 in 0,oi mm. Median striae alternately longer and shorter. — Dia- 

 tomiste II p. 13 PL I f. 6. 



Fresh water: Oregon, fossil! 



The place of this form among the Pundatce is somewhat uncertain. The elongated puncta 

 suggest that it may be akin to Nav. Tuscula, which may be decided by examination of specimens 

 in highly refractive media. The puncta will then perhaps be found to be finely, transversely 

 lineate, in which case its place is near to N. Tuscula. 



16. N. Eta Cl. (1893). — V. subhexagonal or broadly linear, with cuneate ends. L. 0,044; 

 B. 0,019 ram. Axial area distinct, linear, slightly dilated in the middle. Striae 16 (middle) to 20 

 (ends) radiate throughout, punctate; puncta about 21 in 0,oi mm. — Diatomiste II p. 13 PI. I f. 5. 



Marine: Red Sea! Japan! 



