I 



ÖFVERSIGT AF K. VETENSK.-AKAD. FÖRHANDLINGAR 1885, N:0 7. 247 



Lat. cell. 30 /.i. 

 Tewksbury, Mass. 



3. S. dejectum Bréb. 



in Menegh. Syn. Desm. pag. 227. 



Long. cell. 24 ,«; lat. cell. 24 i^i; long. ac. 7 u lat. istlim. 6 w. 



Georgia. 



4. S. aristiferum Ralfs 



Brit. Desm. pag. 123, tab. XXI, fig. 2. 



7^^. trigona, magis constricta; tab. XXVII, fig. 25. 



Tewksbury, Mass. 



5. S. trifldum NoRDST. 



Desm. Brasil, pag. 226, tab. IV, fig. 51. 



ß glahrum nov. var. 

 Var. aculeis longioribus, magis divergentibus, membrana perfecte 



glabra. 

 Long. cell. 32 ^«; lat. cell. 30 ^tt; long. ac. 15 y.. 

 Tewksbury, Mass. 



6. S. luteolum nov. spec. tab. XXVII, fig. 26. 



S. submedriocre, subcirculare, profunde constrictum, in- 

 cisura mediana lineari angustissima, extrorsum ampliata; se- 

 micellulse semicirculares, basi recta, dorso rotundato, angulis 

 inferiobus obtuse rotundatis granulato-crenulatis; a vertice visse 

 trianguläres, lateribus rectis, angulis obtuse rotundatis granu- 

 lato-crenulatis. Membrana crassa, luteola, punctata. 



Long. cell. 33 (.i; lat. cell. 32 ^tt; crass. cell. 32 ,w; lat. istlim. 9 ,t/. 



Tewksbury, Mass. 



7. St ecliinatum Bréb. 



in Ralfs Brit. Desm. pag. 215, tab. XXXV, fig. 24. 

 Tewksbury, Mass. 



8. S. tricorne (Bréb.) Menegh. 



Syn. Desm. pag. 225; Binatella tricornis Bréb. Alg. Falaise 



pag. 57; tab. 8. 

 Long. cell. 24 f.i', lat. cell. 27 }.i; lat. isthm. 7 i.i. 

 Tewksbury, Mass. 



