42 



il. L. gigantca Mcr. 



} 12. L. siibuudiilata Mer. 



? i3. — var. tendla Aler. 



IV. Paradoxae. — Valve with upper apex rounded, lower end 

 more or less produced, pseudoraphe usually very dìstiuct, striae fine, 

 girdle face with angles rounded, septa usually deep, stipcs elongaled, 

 composed of iwo lavers (except in L. grandis), raniification very pe- 

 culiar, not dichotomic (see diagram on p. i52 of La Nuova Nota- 

 risia 1901}. 



1. L. pamdoxa C. Agardh. 



2. L. gracilis (Kùtz.) Grun. 



3. L. dalmatica (Kùtz, Grun. 



4. — var, parva Mer. 



5. — var. tenella Grun, 



6. L. communis (Heiberg.^) Grun. 



7. L. lata Mer. 



8. L. hyalina (Kù^z.) Grun. 



9. L. tìncta (Ag.) Grun. 



} 10. L, grandis (Kiitz.) Grun. 



V. Profundeseptatae. — Valve similar to that of Paradoxae, striaò 

 distìnct at the lower end, sepia very deep, parallcl below the septal 

 puncta, Stipes short, structurless. 



1. L. profundeseptata Mer, 



2. L, Monksiae Mer. 



VI. Lyngbyeae. — Valve narrow, gradually attenuated towards the 

 lower end, upper pari attenuated, often rostrate, striae more or less 

 distinct, not very fine (usually 12-16 in 0.01 mm.), sepia deep. 



1. L. Lynghyei (Kùtz.) Grun, 



2. — var. Pappeana Grun, 



3. L. pacifica Mer. 



4. L. teìiuis (Kùtz.) Grun. 



5. L. rostrata Mer. 



