502 



OLEVE, DIATOMS. 



central is much larger than the others. Striae extremely fine, 

 about 36 in 0,oi mm. (sec Grunow) marginal. Length 0,o8s 

 mm. Breadth 0,oo6 mm. Very rare in the Labuan material. 



— PI. 37, fig. 66. 



N. Sigma var. intercedens Grun. (Gasp. Sea. Alg. pag. 22). 

 Puncta 7, strise 30 in 0,oi mm. 



N. ohtusa W. Sm. Very long and slender form with 10 

 puncta and 27 strise in 0,oi mm. 



N. (Homoeocladia) Vidovichi Grun. (Van Heurck Syn. PI. 

 LXVII, fig. 7) 



N. vitrea Norm. (Grun. Arct. Diat. pag. 93). Puncta 

 7, strise 24 in 0,oi mm. Length 0,i mm. Breadth 0,oo8 mm. 



N. lanceolata W. Sm. var. with 10 puncta and 26 strise in 

 0,01 mm.- Length 0,o8 mm. Breadth 0,oi mm. 



N. longissima (Breb.) Ralfs. (Van Heurck Syn. PI. LXX, 

 fig. 1-2). 



N. ventricosa Kitton j(M. M. Jour. Nov. 1873, pag. 206, PI. 

 XXXVIII, fig. 5). 



Surirella fastuosa Ebb. (A. Schm. Atl. PI. V, fig. 10—13). 



S. cuneata 0. Witt (A. Schm. Atl. PL IV, fig. 1). 



Campylodiscus ambiguus Grev. (A. Schm. Atl. PI. XVIII, fig. 23). 



C. undulatus Grev. (A. Schm. Atl. PI. XVIII, fig. 11). 



var. biangulatus Grev. (A. Schm. Atl. PI. XIV, fig. 18). 



C. Thuretii Breb. a very small variety. 



C. parvulus (W. Sm.?) Van Heurck (Syn. PI. LXXVII, fig. 2). 



a Ralfsii Sm. (A. Schm. Atl. PI. XIV, fig. 3). 



Campylodiscus (? ) cocconeiformis Grun (01. & MOll. Diat. No 

 178 and 214). Length 0,02 — 0,o36 mm. Breadth 0,oi8 — 0,o28 mm. 



— PI. 38, fig. 78. 



Flagiodiscus nervatus Grun. (M. J. 1877, pag. 172, PI. CXCIV. 

 fig. 9). 



Bacteriastrum varians Laud. (Van Heurck Syn. PI. LXXX, 

 fig. 3-5). 



Chmtoceros diversus 01. (Van Heurck Syn. PI. LXXXI, fig. 5). 



Ch. peruvianus Btw. (M. J. IV, pag. 107, PI. VII, fig. 16 

 -18). 



Podosira hormoides Mont. (Van Heurck Syn. PI. LXXXIV, 

 fig. 3). 



Melosira sulcata Ebb. 



Melosira lahuensis 01. N. Sp. — Valve as high as broad, 

 rounded at the end, covered by puncta arranged in straight 

 lines, radiating from the apex to the suture, 18 iii 0,oi mm. 

 Height of valve 0,oo8 mm. Breadth 0,oi2 mm. — PI. 38, fig. 84. 



