474 CLEVE, DIATOMS. 



parallel, very fine, about 30 in 0,oi mm. — PL 37, fig. 47. — 

 Cape Wankarema. 



N. Baculus CI. — Linear, elongate, with rounded ends. Me- 

 dian line broad. Central nodule small. Stria parallel, 19 in 

 0,01 mm., absent from the middle of the valve, generally in- 

 terrupted or as erased towards the middle. Length 0,og5 mm. 

 Breadth 0,oo7 mm. — PL 37, fig. 5L — Cape Wankarema. 



This species seems to come near i\^. FistnJa A. Schm. N. 

 Sea Diat. PL II, fig. 29, which perhaps may be N. inconsin- 

 cua Greg. Diat. of CI. pag. 478, PL IX, fig. 3. "^ 



I do not know these two species. In some mediterranean 

 gatherings I have seen a Navicula closely resembling N. Bacu- 

 lus, but with finer stria?, 26 in 0,oi mm., obsolete or absent 

 from the middle of the valve, but not interrupted as in N. 

 Baculus. Length 0,o53, breadth 0,oo7 mm. It ma}" perhaps be 

 N. Fistula. 



N. inornata Grun. (A. Diat. pag. 46, PL III, fig. 56. N. 

 Acns CI. 1. c. pag. 14, PL III, fig. 55) Finm. 



Sectio : Vanlieiirchia. 



N. (Schizonema) vulgaris Thwaites — Kara (Fresh-water- 

 species?). 



Sectio : Veyce. 



N. Vegce CI. (Plenrosigma Kjelhnanii CI. A. D. pag. 14, PL 

 IV, fig. 80) — Kara, Cape Wankarema. 



var. siibconstricta Grun. (in litt. c. icone) linear with paral- 

 lel margins, constricted in the middle. Transverse strise 15 ^'3- 

 Longitudinal stria? 14 ^U in 0,oi mm. — Cape Wankarema. 



Sectio: Decussatm. 



N. Placenta (Ehb.?) Lewis (Grun. A. Diat. pag. 47, PL III, 

 fig. 60) Finm. 



Nav. Incertce seclis. 



N. perlepida Grun. F. J. L. (unknown to me). 



Stauroneis asxtera Ehb. (St. pulchella W. Sm.), var. interme- 

 dia Grun. Greenl. (BesseLs Bay, Mushroom Point), Finm., 

 Spitsb., Kara (Matotschkin), Cape Deshnew (East Cape). 



St. finmarchica CL & Grun. (A. Diat. pag. 47, PL III, fig. 

 63) Finm., Kara, Cape Deschnew (East Cape). 



St. scandinavica Ldt. (Bih. t. K. Sv. Yet. Ak. Handl. Ill, 

 No 15, pag. 47. Navic. Jacustris A. Sclim. N. Sea Diat. PL I, 

 fig. 29) Kara. 



St. Spicida Dickie (Van Heurck Syn. PL IV, fig. 9) GreenL 

 (Discovery Bay), Spitsb., Cape Wankarema. 



St. desiderata CL (A. Diat. pag. 14, PL III, fig. 58) Kara. 



