NAVICULA ENTOMON. 49 
cable to it, but to N. Apis. Kiitzing’s figure of N. inter- 
rupta represents it as having costate strie radiating from 
the middle of each lobe, not granular and parallel as in his 
and Ehrenberg’s figures of N. Apis. 
Hab. Brackish water: frequent. Estuary of River Co- 
quet, Northumberland (4. S. D.). 
Navicula incurvata, Gregory. 
Navieula incurvata, Greg. Trans. Micr. Soc. n. 8. vol. iv. p. 44, pl. v. 
fig. 13; Ralfs, in Prit. Inf. p. 893. 
Navicula splendida, Greg., var., Rabenh. Europ. Diat. p. 204. 
Navicula interrupta, Kiitz., Grunow, in Wien. Verh. 1860, p. 531, t. iit. 
fig. 20. 
Plate VII. fig. 4. 
V. somewhat elongate, divided into two elliptical lobes by 
a gently sinuous constriction; striz subparallel, fine, 
granular, about 35 to 40 in ‘001"; inner section ob- 
scure, linear; median line broad, tapering towards the 
terminal nodules; central nodule large, orbicular. 
Hab. Submarine. Glenshira sand and Estuary of the 
Clyde (Prof. Gregory) ; Estuary of River Coquet, North- 
umberland (A. S. D.). 
Navicula Entomon, Ehrenberg. 
Navicula Entomon, Ehren. Leb. Kr. 1840; Kiitz. Bac. p. 100, t. xxviii. 
fig. 74; Ralfs, in Prit. Inf. p. 893. 
Pinnularia Entomon, Ehren. Amer. 1844, t. I. i. figs. 8 & 4; Rabenh. 
Europ. Diat. p. 218. 
Diploneis Entomon, Ehren. Mikrogeo. t. xix. fig. 80. 
Navicula splendida, Greg. Trans. Micr. Soc. n. s. vol. iv. p. 44, pl. v. 
fig. 14; Ralfs, in Prit. Inf. p. 893; Rabenh. Europ. Diat. 
p- 204. 
Plate VII. fig. 5. 
Frustule large. V. divided by a gentle sinuous constriction 
F 
