496 CLEVE, DIATOMS. 
N. abrupta Greg. var. 
N.: bullata Norm; (MYM Sit page re PI i5e 40): 
Narclavata Greg (TAM: BAIV, påg. 26 PLV fs LD 
N. exul ÅA: Schm. (Atl. Pl: II; fig. 18). 
N. Greffii Grun. (A. Schm. Atl. Pl. VII, fig. 5—6). 
N. Smithii Bréb. (A. Schm. Atl. P1. VII, fig. 14—18). 
N. mnitescens Greg. (A. Schm. Atl. Pl. VII, fig. 38). 
N. suborbicularis Greg. (A. Schm. Atl. Pl. VIII, fig. 1, 2,5). 
N. Campylodiseus Grun. (A. Schm. Atl. Pl. VIII, fig. 9). 
N. notabilis Grev. (A. Schm. Atl. P1. VIII, fig. 46). 
N. latissima Greg. (T. M. S. IV, pag: 40, Pl. V, fig. 4. A. 
Schm. Atl. P1. VI, fig. 7). 
var. kamorthensis Grun. (A. Schm. Atl. Pl. VI, fig. 8). 
N. humerosa Bréb. (A. Schm. Atl. PI. VI, fig. 4): 
N. caribea Cl. (A. Schm. Atl. P1. VI, fig. 10—12). 
N. brasiliensis Grun. (A. Schm. Atl. Pl. VI, fig. 21 and 32). 
N. sublyrata Grun. — Valve constrieceted in the middle, 
covered with parallel or sub-parallel strie, composed of distinct 
puncta, 12 in 0,01 mm., reaching to the median line. Length 
0,046 mm. Br. 0,01 mm. at the constriction 0,007 mm. — Pl. 35, 
HSN: 
Mr. Grunow has sent me a sketch of his N. sublyrata, 
which lives in brackish water in North America. The Ameri- 
can species is not so strongly constricted in the middle as 
my specimen from Labuan. N. Ceylanensis Leud. Fortm. 
(Diat. Ceyl. P1. II, fig. 25) seemes to be nearly related to this 
species. 
N. scopulorum Bréb. (Donk. B. D. Pl. XII, fig. 5). 
N. O' Mearii Grun. Mpt. — Elongate, with more or less 
rounded ends; median line straight, terminal nodules in the 
ends, central nodule small. Strix transverse and longitudinal 
covering the whole valve. Transverse strie almost parallel, 
or very little radiant, 16 to 17 in 0,01 mm., longitudinal 18— 
21 in 0,01 mm. 
forma typicea Grun. Mpt. — Length 0,o66 mm. Breadth 0,009 
mm.  Transv. str. 17, longit. 20 in 0,01 mm. Outline lanceolate, 
equally tapering from the middle to the somewhat acute ends. 
— Seychells, Grun. 
var. labuensis Cl. Length 0,o72 mm. Breadth 0,015 mm. 
Transv. strize 17 in 0,01 mm. longitudin. strie 21 in 0,01 mm. 
Outline elliptic with rounded ends. — Labuan, rare. 
var. minor Cl. Length 0,05 mm. Breadth 0,011 mm. ”Trans- 
