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



alternating witli 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. Costse 6,5 in 0,oi mm. punota 

 10 in 0,ui mm. Connecting zone finely striate. — Consp. er. p. 58. Kutz. Bac. p. 77 Pl. XX 

 f. 1. Pritch Inf. Pl. 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. Ä. Carmichaeli Grbv. according to Klitz. 



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

 North Sea! Adriatic! Mediterranean Sea! Belgium (V. H.), S:t Panls Island (Grun.). 



2. A. javaiiica Grun. (1878). — Broadly elliptical to lanceolate, gradually tapering to tlie 

 obtnse or subacnte ends. L. O, os to 0,06; B. 0,oi3 to 0,o2^ mm. Upper V. with narrow axial 

 area. Costffi 5 to 6 in 0,oi mm., puncta 11 to 12 in 0,ui 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. Costse 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. Nio 147. A. D. p. 18. 



Marine: Java! China! 



Var. rhombica Grun. — Rhomboid-Ianceolate. L. U,ufi8; B. O, oss mm. Costce 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 O.os; 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 spöt on both sides of the area. Lower V. with narrow axial area and 

 narrow stauros. Costse 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. cosfata 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 costse, is probably an allied form. 



Iniperfectly known species, wJiich cannot, for the present, be adniitted in the above 



monograph. ') 



Cocconeis oemula 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. Iludsonis), but the figure does not shew the finer structure. 

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



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

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

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

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

 C. coardata A. S. Atl. CXC f. 37. 

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

 6'. contermina A. S. Atl. CXCVI f. 21. 

 C. dincrepam A. S. Atl. CXCIII f. 26 to 28. 

 a dispar A. S. Atl. CXCIII f. 41. 

 C. cfjena A. S. Atl. CXCIII f. 24. 

 C. Fchiffcri Br. A. S. Atl. CXCIII f. 58 (Biploncis microtufoa Pant.). 



') No reference has beoii takoii tu tliu iilatus CXCVll — Vill of A. S. All. 



