73 
striz, and by its outline near the extremities, which are much 
more produced. HEY 
NAVICULA ELLIPTICA, Kiitz. 
Navicula elliptica, Kutz., Bacill., p. 98, t. XXX., fig. 55; Rabenh., Europ. 
Diats., p. 179;Sm., Syn., Vol II., p. 92; Ralfs in Prit. Infus., p. 899; Van. Heurck, 
pl. X, fig. 10; Donkin, p. 7, pl. I., fig. 6. 
N. ovalis, Sm., Syn.; Vol. I., p. 48., pl. XVIL., fig. 153. 
Valve oval, or linear-elliptical, strie granular, connivent, sep- 
arated from the median line on each side by a curved longitudi- 
nal line bulging outward at the central nodule. 
Hlab.—Brackish water, common. Salt meadows at New 
Dorp. (Fig. 14.) | 
NAVICULA HITCHCOCKII, Ehr. 
Navicula Hitchcockii, Kutz., Racill., p. 101; Ralfs in Prit., Infus, p. 894, pl. 
VIL., fig. 62; Donkin, p. 29., pl. V., fig 4. 
Valve oblong with triundulating margins terminating in cu- 
neate apices ; striz fine and transverse, reaching to the median line. 
Hab.—Fresh water, scarce. In ponds, Clifton, New Brighton, 
(Fig. 15.) 
NAVICULA LYRA, Ehr. 
Navicula lyra, Kutz., Bacill., p. 94., t. XXVIII., fig. 55; Sm., Syn., Vol. I1., 
p- 93; Greg., D. of the Clyde, p. 13, pl. I., fig. 13; Ralfs in Prit. Infus., p. 897; 
Rab., Eu. Diat., p. 177; Donkin, p. 14, pl. I., fig. 7; Van Heurck, pl. 10, fig. 1. 
Valve elliptical-linear; extremities produced and rounded or 
cuneate; striz oblique, moniliform, interrupted by two longitudi- 
nal unstriated bands branching out from the central nodule toward 
the extremities in the form of a lyre. 
Hab,—Marine, frequent. South Beach, Clifton, Prince’s Bay, 
(Fig. 16.) 
NAVICULA IRIDIS, Ehr. 
Navicula iridis, Kutz., Bacill., p. 92, t., XXVIIL., fig. 42; Ralfs in Prit. Infus., 
p- 907; Rabenh., Eu., Diat., p. 171; Van Heurck, pl., XIII., fig. 1; Donkin, p. 30, 
pl. V., fig. 6. 
Pinnularia iridis, Rabenh., Sussw., Diat., p. 42, t. VI., fig. 1. 
NX. firma, Sm., Syn., Vol. 1., p. 48, pl. XVL, fig. 138. 
Valve linear-oblong, with obtuse extremities ; striz fine, trans- 
verse, reaching to the median line, longitudinally crossed near 
the margin. 
Hab.—Fresh water, frequent. Clifton, New Brighton, New 
Dorp. (Fig. 17) - 
