104 p. T. CLEVE, SYNOPSIS OF THE NAVICULOID DIATOMS. 



Var. Grunoioii Cl. — V. very slightly constricted, with broad tongue-shaped segments. 

 L. 0,07 to 0,09; B. 0,033 to 0,039; at the constr. 0,03 to 0,037 mm. Furrows very broad. Costse 

 5,.^ to 7 in 0,01 mm. alternating with ocelli, forming some few more or less undulating, longitu- 

 dinal rows. — Nav. gemmatula GtKun. A. S. Atl. XIII f. 20, 21 (37, 40?). Nav. lacrimans A S. 

 Atl. XII f. 61. 



Marine: Balearic Islands! Red Sea! Mauritius! Tamatave! Sumatra! Yokohama! Samoa! 

 Campeachy Bay (Atl.). Fcssil: Moravian Tegel! S:ta Monica, Calif. (Deby Coll.)! 



Var. lacrimans A. S. (1875). — V. elongated, slightly constricted in the middle. L. O.09 to 

 0,14; B. 0,031 to 0,045; at the constr. 0,o25 to 0,04 mm. Furrows broad. Costse 5 in O.oi mm. 

 Ocelli about 4 in 0,oi mm., forming longitudinal rows. — Nav. lacrimans A. S. Atl. XII f. 59, 60. 

 Nav. gemmatula Cl. D. of Mor. Tegel PL XII f. 1. Nav. lacr. var. fossilis Pant. II p. 49 PI. II 

 f. 18. Nav. Taschenbergeri A. S. Atl. CLXXXIV f. 8 (1892). 



Marine: Tamatave (Deby Coll.)! Campeachy Bay! Colon! Fossil: Szakal, Hungary! Moravian 

 Tegel! 



Var. Beyrichiana A. S. (1861). — V. slightly constricted, with cuneate ends. L. 0,09 to 

 0,144; B. 0,35 to 0,062; at the constr. 0,027 to 0,053 mm. Furrows of median breadth, distinctly 

 dilated around the central nodule. Costee 6 in 0,oi mm. alternating with rows of large ocelli 

 (about 5 in 0,oi mm.). — Nav. Beyrichiana A. S. Atl. LXIX f. 16, 17. 



Marine: Gulf of Naples! Madagascar! Java! China! Indian Ocean (Deby Coll.)! Cape Horn 

 (Petit). Fossil: Hungary! .^gina (Atl.). 



Forma minor Pant. (1886). — V. nearly elliptical. L. 0,o69; B. 0,o34 mm. Costse and 

 ocelli about 5,5 in 0,oi mm. — Nav. Beyr. var. minor Pant. I p. 23 PI. Ill f. 31. 



Marine: Hungary, fossil (Petit). 



Var. Moravica Cl. — V. slightly constricted, with broad, cuneate ends. L. 0,i6; B. 0,068; 

 at the constr. 0,0 6 mm. Costse 4 in 0,oi mm. Ocelli scattered, 2 to 3 in 0,oi mm. 



Marine: Moravian Tegel (Deby Coll.)! 



83. D. lesinensis Grun. Ms. — V. elongated, usually very slightly constricted, with broad, 

 tongue-shaped segments. L. 0,o72 to 0,22; B. 0,03 to 0,057; at the constr. 0,028 to 0,05i mm. 

 Central nodule small, its horns parallel, approximate. Furrows narrow, linear, scarcely dilated in 

 the middle, with a row of large puncta or rudiments of the costse. Costse 5 to 6 in 0,oi mm. 

 alternating with rows of large and close ocelli (5 to 7 in 0,oi mm.) and double rows of small, 

 sometimes little distinct, alveoli (about 12 to 18 in 0,oi mm.). — PI. II f. 17, 18. 



Marine: Balearic Islands! Gulf of Naples! Adriatic! Red Sea! Sumatra (Deby Coll.)! Philip- 

 pines (Rae CoU.). 



D. lesinenses has the form and appearance of a large D. Entomon. 



Additional. 



Navicula Budayana Pant. Ill PI. IV f. 57 (1893) seems to belong to the varieties of 

 D. elUptica. 



Navicula elliptica var. fossilis Pant. Ill PL II f. 32 perhaps a small form of D. Smithii, 

 which 1 am unable to decide as the minute structure is not visible on the figure. 



Navicula pervasta Pant. Ill PL XXXVl f. 510 a large form, very similar to D. major 

 var. permagna, but the alveoli are drawn as forming single rows. 



