149 



Locality : Adriatic (Pola), rare. 



This species resembles at first sight L. Jlabellala but differs by 

 the much broader valves, the peculiar form of the girdle face (in 

 which respect L. giganiea resembles L. remulus Gr.) and the granu- 

 lar endochrome [L. flabellata has 4 plates). 



14. L. Grunowii Mer. [fig. 7]. 



Valve rather narrow, gradually attenuated towards the lower end, 

 with straight margins, upper end attenuated, with apex subrounded 

 or acute, lower end somewhat acute. Pseudoraphe broad, striae very 

 robust, parallel throughout. 8 in 0.0 1 mm. near the lower end, 8-9 

 in the middle. Girdle face rather broad with very thlck robust outli- 

 nes, upper angles acute; septa rather deep (0.0088 mm.), straight, 

 very thlck. Endochrome granular. Forming colonies sessil or on 

 very short slructurless stipes. Length 0.060-0.100 mm. (usually o.oyS- 

 o.o85 mm), breadth of the girdle face o.0266-o.o5o mm., breadth of 

 the valve o. 01 14-0.0143 mm. 



Locality : Black sea (lalta, Sebastopol), very common ! Mediterra- 

 nean (Villefranche, Genua), rare! Sicily (Catania), common! Adriatic 

 (Pola, Fiume), rare. 



I do not find in the Synopsis of Van Heurck or elsewhere any 

 species to which the above described could be refered. It is nearly 

 allied to L. Ehrenbergii but the valves are quite different. 



i5. L. Grunowii var. elongata Mer. [fig. 8], 



Differs from the type species by its larger size and comparatively 

 narrower valves, with superior apex acute, sometimes somewhat ro- 

 strate. The girdle face is also narrower and the septa a little deeper 

 (0.01 14 mm.). Length 0.08Ó-0. igS mm. (usually 0.124-0. 143 mm.), 

 breadth of the girdle face 0-042-0.0665 mm., breadth of the valve 

 0.0143-0 0166. 



Locality: Black sea, Crimea (Goursouf, Theodosia), very com- 

 mon! Mediterranean (Neapel), rare! Hawaii, common. 



In one of the gatherings from the Black sea (Goursouf) and in 



