BIHANG TILL K. SV. VET.-AKAD. HANDL. BAND 21. AFD. III. N:0 2. 9 



niiddle of tlie valve. End-fissiires elongated, as in tlie typical 

 form, biit with two rows of pnncta instead of the fissure-like 

 lines 011 the sides of the central nodule. 

 Kv. 26. — Very rare. 



P. subsolaris var. liuearis Grun. — A. S. XLV, 29. 



Valve 0,1 to 0, 13 in length, 0,oi3 to 0,oi8 in breadth, 

 slightly gibboiis in the middle. Ends rounded, with senii- 

 circular end-iissures at some distance from the margin. Striae 

 radiate, 12 in 0,oi mm. Axial area strongly dilated in the 

 middle of the valve. 



Jm. 6, Gl. D. 44. — Rare. 



P. acrosphjeria BréB. — A. S. XLIII, 14-17, 23. 



A small form. like the above mentioned figure 23 by A. 

 ScHMiDT. 0,05 mm. in length, 0,oi mm. in breadth, with 12 

 to 13 parallel striae in 0,oi mm. was found in Kv. 26, to- 

 gether with a few larger ones. — Rare. 



P. semicruciata A. ScHM. — A. S. XLIV, 44. 



Lapponian specimens are 0,04 5 mm. in length, 0,oi4 mm. 

 in breadth and have 13 to 14 striae in O.oi mm. 

 Tr. 38, Ke. 49. — Rare. 



P. divergens W. Sm. — B. I). XVIII, 177. 



Kv. 9, 16, 32, 34, Nu. 14, 18, 19, 25, 27, 39, Ks. 15, Jm. 6, 

 Km. 10, Tr. 38, V. 12, Tj. 42, Gl. 47, Gl. D. 44, Ke.49.— Frequent. 



This variable speeies graduates on one side to P. Legn- 

 men, on the other to P. microstauron and P. Brébissonii. In 

 Nu. 18 some specimens occur, that differ from the latter by 

 their length only (0,o6 5 mm.) 



Var. elliptica Grun. — Fr. J. pl. I, 19. 



Typical specimens of this variety were found in Kv. 32, 

 Nu. 17, 41, S.-K. 7; less broad, slightly constricted, forms in 

 Kv. 1, Nu. 25. — Rather rare. 



P. Legumen Ehb. — V. H. VI 16, 17. 



Ks 15. — Rare. 



P. luicrostaurou Ehb. P. Brébissonii var. subproducta Grun. 



in V. H. V, 9. Cl. Finl. p. 28, A. S. XLIV, 34. 



Kv. 1, 9, 26, 28, 32, 34, Nu. 2, 5, 17, 18, 19, 25, 37, Ks. 20, 

 Jm. 31, Km. 10, 30, Na. 35, V. 12, Tj. 42, S.-K. ^1'2, 33, Gl. 43, 

 Gl. D. 45. — Verv common. 



