474 CLEVE, DIATOMS. 
parallel, very fine, about 30 in 0,01 mm. — Pl. 37, fig. 47. — 
Cape Wankarema. j 
N. Baculus Cl. — Linear, elongate, with rounded ends. Me- 
dian line broad. Central nodule small. Strie parallel, 19 in 
0,01 mm., absent from the middle of the valve, generally in- 
terrupted or as erased towards the middle. Length 0,065 mm. 
Breadth 0,007 mm. — Pl. 37, fig. 51. — Cape Wankarema. 
This species seems to come near N. Fisthula A. Schm. N. 
Sea Diat. P1. II, fig. 29, which perhaps may be N. inconspi- 
cua Greg. Diat. of Cl. pag. 478, P1. 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 strixe, 26 in 0,01 mm., obsolete or absent 
from the middle of the valve, but not interrupted as in N. 
Baculus. Length 0,o53, breadth 0,007 mm. It may perhaps be 
N. Fistula. 
N. inornata Grun. (A. Diat. pag. 46, Pl III, fig. 56. N. 
Acus Cl lic: pag. 14, P1 III, fig:55)y Finm. 
Sectio: Vanheurckia. 
N. (Schizonema) vulgaris Thwaites — Kara (Fresh-water- 
species ?). 
Sectio: Vege. 
N. Vege Ol. (Pleurosigma Kjellmanii Ol. A. D. pag. 14, Pl. 
IV, fig. 80) — Kara, Cape Wankarema. 
var. subconstriceta Grun. (in litt. c. icone) linear with paral- 
lel margins, constricted in the middle. Transverse strie 15 1/3, 
Longitudinal strise 14!/3 in 0,01 mm. — Cape Wankarema. 
Sectio: Decussate. 
N. Placenta (Ehb.?) Lewis (Grun. A. Diat. pag. 47, P1. III, 
fig. 60) Finm. 
Nav. Incerte sedis. 
N. perlepida Grun. F. J. L. (unknown to me). 
Stauwroneis aspera Ehb. (St. pulchella W. Sm.), var. interme- 
dia Grun. Greenl. (Bessel's Bay, Mushroom Point), Finm., 
Spitsb., Kara (Matotschkin), Cape Deshnew (East Cape). 
St. finmarchiea Cl. & Grun. (A. Diat. pag. 47, P1. III, fig. 
63) Finm., Kara, Cape Deschnew' (East Cape). 
St. scandinavica Ldt. (Bih. t. K. Sv. Vet. Ak. Handl. III, 
No 15, pag. 47: Navic. lacustris A. Schm. N. Sea Diat. PI. I, 
fig. 29) Kara. 
St. Spicula Dickie (Van Heurck Syn. P1. IV, fig. 9) Greenl. 
(Discovery Bay), Spitsb., Cape Wankarema. 
St. desiderata C1. (A. Diat. pag. 14, P1. III, fig. 58) Kara. 
