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



alternating with double rows of puncta, 9 in 0,oi mm. Lower V. with almost indistinct axial 

 area. Central nodule a narrow stauros, not bifid at the margin. Costee 6, ft in 0,oi mm. puncta 

 10 in 0,0 1 mm. Connecting zone finely striate. — Consp. cr. p. 58. KtJTZ. Bac. p. 77 PL XX 

 f. 1. Prxtch Inf. PI. VII f. 42. W. Sm. B. D. II p. 26 PL XXXV f. 300; PL XXXVI f. 300. 

 V. H. Syn. p. 129 PL XXVI f. 13 to 16. A. Carmichaeli Grev. according to Kutz. 



Brackish water and marine: Coasts of Britain (Sm.), Baltic! Mansfelder Seen in Saxony! 

 North Sea! Adriatic! Mediterranean Sea! Belgium (V. H.), S:i Pauls Island (Grrun.). 



2. A. javaiiica Grdn. (1878). — Broadly elliptical to lanceolate, gradually tapering to the 

 obtuse or subacute ends. L. 0,o3 to 0,06; B. 0,oi3 to 0,02.') mm. Upper V. with narrow axial 

 area. Costaj 5 to 6 in 0,oi mm., puncta 11 to 12 in 0,oi mm. Near the margin are two obsolete 

 longitudinal lines (according to Grunow). Lower V. with very narrow axial area. Central nodule 

 transversely dilated into a stauros, bifid near the margin. Costa; 6 to 7 in 0,oi mm. radiate in 

 the middle and transverse at the ends, alternating with double rows of puncta, 13 in 0,oi 

 mm. — Cl. M. D. N:o 147. A. D. p. 18. 



Marine: Java! China! 



Var. rhombica Grun. — Rhomboid-lanceolate. L. 0,ob8; B. 0,o35 mm. Costse of the lower 

 V. 4,5 to 5 in 0,01 mm. — A. D. p. 18. 

 Marine: Java! 



3. A. bengalensis Grun. (1880). — Linear with rounded ends. L. 0,o28 to 0,o5; B. 0,oo8 

 to 0,0 9 mm. Upper V. with narrow axial area and 5 to 6 costse in 0,oi mm., crossed between 

 the area and the margin by a longitudinal line. Puncta about 13 in 0,oi mm. At each end of 

 the valve is a small blank spot on both sides of the area. Lower V. with narrow axial area and 

 narrow stauros. Costte 8 in 0,oi mm., alternating with double rows of puncta, about 20 in 0,oi 

 mm. — A. D. p. 18. 



Brackish water: Bengal (Grun.). 



Achn. costata Grev. (T. Bot. Soc. Edinb. Vol. VIII p. 438 PL VI f. 8 to 10; 1866) figured 

 as having a single row of puncta between the costae, is probably an allied form. 



Imperfectly known species, which cannot, for the present, he admitted in the above 



monograph. ') 



Cocconeis cemula A. S. Atl. CXCIV f. 18. 



C. arcta A. S. 1. c. CXCI f. 1 seems to be a new species belonging to Microneis (nearest 

 to A. Hudsonis), but the figure does not shew the finer structure. 

 C. hiflexa A. S. Atl. CXCIII f. 25. 



C. hiradiata Br. A. S. Atl. CXC f. 1 an indeterminable, probably corroded, upper valve. 

 C. blandicula A. S. Atl. CXCII f. 17. 

 C. campechiana Grdn. A. S. Atl. CXCII f. 1. 

 C. cincta A. S. Atl. CXC f. 38 (Campylodiscus sp.?). 

 a. coarctata A. S. Atl. CXC f. 37. 

 U. comis A. S. Atl. CXCII f. 2. 

 C. contermina A. S. Atl. CXCVI f. 21. 

 0. discrepans A. S. Atl. CXCIII f. 26 to 28. 

 C. dispar A.-S. Atl. CXCIII f. 41. 

 G. egena A. S. Atl. CXCIII f. 24. 

 C. Febigeri Br. A. S. Atl. CXCIII f. 58 {Biploneis microtatos Pant.). 



') No reference has been taken to the plates CXCVH— VIII of A. S. Atl. 



