144 



to each of ihem. Stipes very short, tlattcned, slruoturlcss. Individuals 

 isolatcd, rarely unitcd in pairs. Lenght 0.0041-0.0070 mm., breadth of 

 the girdle face 0.0019 mm., breadth of the valve about 0.00 1 52 mm. 



Locality: Mediterranean (Villefranche), common (occasionally). 



This is the smallest of ali species, the largest being L. Cro-ierii 

 Grun., which attains, according to Grunow, 0.8 mm., a difference bet- 

 vvcen both of 1 to 100! 



4. L. capitata Mer. 



Valve davate, with the upper portion strongly inflated, abruptly 

 attcnuated near the upper quarter, teiminating in a long and very 

 narrow lower part; upper end attenuated and somevvhat rostrate. 

 Striae very fine. Girdle face very delicate, outlines thin, very nar- 

 rowly cuneate, upper angles slightly rounded. Sepia very thin, 

 straight, supcrficial, septal puncta very small, quite marginai. Forming 

 small colonies of 2 to 4 individuals on short, dichotomeously divi- 

 ded stipes; stipcs composed of a centrai darker axial part and a 

 thick hyaline outer layer. Length 0.037-0.040 mm., breadth of the 

 girdle face o.ooò2-o.oo6ò5 mm., breadth of the valve o.oo57 mm, 



Lacality: Adriatic (l^ola), rare. 



This species resembles L. hastata var. clavaia Mer., differing 

 mainly by the quite marginai septa, il is also smaller and much 

 more delicate. 



5. L. dalmatica var. parva Mer. 



Valve of medium breadth, very gcntly attenuated towards the 

 lower end, which is more or less acute, not protracted, margins 

 straight, upper end broadly rounded, usually somewhat attenuated. 

 Striae very line. Girdle face rather broad, cuneate, upper angles 

 broadly rounded, upper margin convex. Septa shallow, their length 

 o.(j)0 19-0.004 2 7 mm., gently arcuate, thin, becoming stronger near the 

 septal puncta; the lalter small but very distinct, round, secondary 

 puncta largo. Forming numerous colonies on long stipcs of the 

 type ol L. /niradoxa, i. e., composed of two layers, the outer thick 



