17G p. T. CLEVE, SYNOPSIS OF THE NAVICULOID DIATOMS. 



Var. hengalensis Grun. (1875). — V. less asymmetrical, almost boat-shaped, with straight 

 or slightly centrally gibbous ventral margins. Ends obtuse. L. (),o8 to 0,ii; B. 0,024 to 0,027 

 mm. Median line slightly arcuate. Axial area linear, scarcely dilated around the central nodule. 

 Striffi 7,5 (middle) to 9 (ends) in 0,oi mm., coarsely punctate; puncta 12 to 13 in 0,oi mm. — • 

 C. heng. Grun. in A. S. Atl. IX f. 12, 13; LXXI f. 79. Kitto.y Linn. Soc. Bot. XX PI. XL VIII 

 f. () (1884). Cl. M. D. N:o 194. 



Fresh water: Bengal! Socotra (Kitton). 



C. as^icrd is a very common species, easily recognized by its boat-shaped outline, its coarsely 

 punctate striiu and always distinct area. It appears to be more closely akin to C Ehrcnberyii 

 than to the boat-shaped C. lanceolafa, C. Cishila etc. It seems questionable whether the var. crassa, 

 which I have not seen, ideally belongs to C. aspera. It may possibly be more akin to C. Oistido. 



* C. salilia Pant. (1889). — V. boat-shaped, with arcuate dorsal margin, straight ventral 

 margin and obtuse ends. L. 0,o5 8.'); B. 0,oi3 mm. Median line arcuate. Axial area distinct linear, 

 slightly dilated around the central nodule. Striiii 12,,^) to 13 in 0,oi mm. punctate. — Pant. II 

 p. 40 PL I f. 9. 



Brackish water: Hungary, fossil (Pant.). 



This species is not known to me, but seems, to judge from the fig. in Pantocsek's work to 

 be allied to (J. (ispcra, from which it differs by smaller size and closer stri;c. 



GO. €. tuinida Br^b. (1849). — V. boat-shaped with slightly centrally gibbous ventral 

 margin. Ends rostrate-truncate. L. 0,o.'> to 0,i; B. 0,oi8 to 0,022 mm. Median line arcuate. 

 Axial area narrow, linear, suddenly dilated around the central nodule to an orbicular or sub- 

 quadrate central area. A stigma with a fine fissure below the central] nodule. 8tricC 8 or 9 

 (middle) to 10 or 12 (ends) in 0,oi mm., I'adiate, towards the ends almost parallel, distinctly 

 punctate; puncta about 20 in 0,oi mm. — Coccon. tmnidum Br^b. in Kiitz Sp. Alg. p. 60. Cy. 

 turn. V. H. Syn. p. 64 PI. II f. 10. Cocc. gihhum A. S. Probst, f. 17. 6'v/. siomatopltora (Irun. in 

 A. S. Atl. X f. 28 to 30. Coccon. sfomat. Grun. A. J), p. 26. 



Fresh water: Sweden (Westergotland, Goteborg)! Holstein (V. H. T.), Belgium (V. H.), 

 Germany! France! Mouth of Jenissey! Japan! Bengal! New Zealand! Australia, Victoria! Ame- 

 rica (Illinois, California)! 



Var. horcalis Grun. (1880). — Ends obliquely truncate, not rostrate. Striffi 8 in 0,oi mm. 

 — Cocc. stomat. car. horealis Grun. A. D. p. '2Q. 



Fresh water: Sweden (Grun.), Niagara Falls! 



Var. gibha Grun. (1880). — Dorsal margin with 3 to 4 undulations. Stritie 8 to 9 in 0,oi 

 mm. — Coccon. stomat. var. gibha Grun. A. D. p. M. 



Var. fossilis Grun. (1880). — V. with less rostrate and more rounded ends. Stigma with 

 shorter fissure than in the type. — Coccon. stomat. var. fossilis Grun. A. D. p. 2i). 



Fresh water: Habichtswald, fossil (Grun.). 



61. €. australica A. S. (1875). — V. boat-shaped with centrally gibbous ventj'al margin 

 and truncate or rounded obtuse ends. L. 0, 1 to 0,14; B. 0,020 to 0,o3 mm. Median line arcuate. 

 Axial area linear, suddenly dilated around the centi'al nodule to an oi-bicular space. A stigma 

 with a distinct fissure below the central nodule. Striae 7 (middle) to 9 (ends) in 0,oi mm. slightly 

 radiate in the middle, parallel at the ends, coarsely punctate; puncta about 13 in 0,ui mm. — 

 Cocc. austr. A. S. Atl. X f. 34, 35. Cl. M. D. N:o 295. 



Fresh water: Australia! New Zealand! 



()2. €. puHctifera Cl. N. Sp. — V. boat-shaped, with truncate ends. L. 0, i:i; B. 0,02 mm 

 Median line arcuate; terminal fissures reflexed. Axial area linear, suddenly dilated to an orbicular 

 central area. Stigma in the middle of the central nodule, without distinct fissui'e. Stria- 8 in 0,oi 



