474 CLEYE, DIATOMS. 



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

 Cape Wankarema. 



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

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

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

 terrupted or as erased towards the middle. Length 0,065 mm. 

 Breadth 0,oo7 mm. — PI. 37, fig. 51. — Cape Wankarema. 



This species seems to come near N. Fistula A. Schm. N. 

 Sea Diat. PI. II, fig. 29, which perhaps may be N. inconspi- 

 cua Greg. Diat. of CI. pag. 478, PI. 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 strise, 26 in 0,oi mm., obsolete or absent 

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

 Baculus. Length 0,o63, breadth 0,oo7 mm. It may perhaps be 

 N. Fistula. 



N. inornata Grun. (A. Diat. pag. 46, PI. Ill, fig. 56. N. 

 Acus CI. 1. c. pag. 14, PI. Ill, fig. 55) Finm. 



Sectio: VanheurcMa. 



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

 species?). 



Sectio: Vegce. 



N. Vegce CI. (Fleurosigma Kjellmanii CI. A. D. pag. 14, PI. 

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



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

 lel margins, constricted in the middle. Transverse striae 15 ^/s. 

 Longitudinal strife 14 '/s in 0,oi mm. — Cape Wankarema. 



Sectio: Decussatce. 



N. Placenta (Ebb.?) Lewis (Grun. A. Diat. pag. 47, PI. Ill, 

 fig. 60) Finm. 



Nav. Incertce sedis. 



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



Stauroneis aspera Ebb. (St. pulchella W. Sm.), var. interme- 

 dia Grun. Greenl. (Bessel's Bay, Mushroom Point), Finm., 

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



St. finmarchica CI. & Grun. (A. Diat. pag. 47, PI. Ill, fig. 

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



St. scandinavica Ldt. (Bib. t. K. Sv. Vet. Ak. Handl. Ill, 

 No 15, pag. 47. Navic. lacustris A. Schm. N. Sea Diat. PI. I, 

 fig. 29) Kara. 



St. Spicula Dickie (Van Heurck Syn. PI. IV, fig. 9) Green]. 

 (Discovery Bay), Spitsb., Cape Wankarema. 



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



