KON(iL. SV. VKT. AKADEMIENS IIANDLINGAR. BAND 26. N:0 2. 41 



Var. quadrata W. Sm. (1853). — V. rliomboidal. brond, slightly sigmoid. L. 0,i 9; B. 0,04 8 itim. 

 Median line central. (Central nodulo small, elongated. Ti'ansv. and obi. strise '7i8 ^" ^^1"' ^^^- — 

 P. rmgulafiim AV. Sm. Ann. M. Nat. H. [2] IX p. 7 Pi. I f. 7 (18f)2). P. (jnadr. W. Sm. B. D. T 

 p. (;:)"P1. XX f. 204. Per. V f. 7, «. P. an<i. rar. quadr. V. H. S.yn. p. Uf) PI. XVIIT f. 1. 



Marine: North Sea! 



Var. strigosa W. Sm. (1852). — Lanceolate, slightly sigmoid, gradually tapering to the sub- 

 acute ends. L. 0,1. "j to 0,28; B. 0,o3 mm. Transv. and obi. striic equidistant, 18 to 22 in 0, 01 mm 

 Angle about 60\ — P. sirigosum W. Sm. Ann. M. Nat. H. [2] IX p. 7 PI. I f. fi. B. D. I p. 04 

 PL XXI f. 203; XXIII f. 203. Per. V f. 1, 2. P. nng. rar. sirig. V. H. Syn. p. 1 15 PI. XIX f. 2. 



Marine: North Sea! Mediterranean Sea! Adriatic! Red Sea! Ceylon! Java! South Africa! 

 Brazil! Florida! 



Var. finmarrhira Cl. (1884). — Gently sigmoid, more obtuse. Median line excentric towards 

 the ends. L. 0,i7 to 0,2; B. O,!!.-? mm. Transv. and obi. striai '7i5i 'Vn i" ^'i"' "i"^- — P- Nor- 

 manii Cl. A. 1). p. 14. Grfx. A. D. p. 52 PI. Ill f. 67. P. Finm. Grun. Franz Josephs Land 

 J), p. 105 (53). 



Marine: Finmark! 



A^ar.? cmn-cxu))! Grun. (1880). — V. very convex. L. 0,22.'); B. 0,02 mm. Median line .some- 

 what excentric at the ends. Transv. and obi. stritE -"/jg in 0,oi mm. — P. strig. var.? convexa 

 Grun. A. D. p. 50. 



Marine: Puerto Caballo (Grun.). 



27. P. miniitnin Grun. (1878). — V. lanceolate, gently sigmoid. L. 0,05 to 0,o65; B. 0,oi 1 

 to 0,(114 mm. Median line nearly central. Transv. and obi. .strife ^"^g' ^''lisi "^^li^ '^"^ O'^" rcvm.. 



— Grun. in Cl. M. J). 13G. Icon. n. PL IV f. 19. P. (sstuarii var. ininuta Grun. A. D. p. 52. 

 Per. V f. 15. 



Brackish and marine: Sweden (Malmo! Lysekil, Grun.), Caspian Sea (Grun.), Balearic 

 Islands (Per.). 



This little form was placed by Grunow in the vicinity of P. (fi^inorn, with which it seems 

 to me not to have any close relation, as it (lifters by its non-rostrate ends, the iiearly central me- 

 dian line, and the finer striation. It may perhaps be a dwarf-form of P. angidatum {strigosurn). 



28. P. (Rhoicosigma) Stuxbergii Cl. and Grun. (1880). — V. narrow, lanceolate, gently 

 sigmoid, acute. L. 0,io to 0,.38; B. 0,028 to 0,o.T2 mm. Median line central. Central nodule small, 

 rhomboid. Transv. and obi. striiie --'/o^, -*/27, ^^/ji iu 0,oi mm. — A. D. p. 54 PL IV f. 74. Grun. 

 Franz Josephs Land D. p. 105 (53) PL If. 56. Per. VI f. 9, 10. 



Marine: Franz Josephs Land (Grun.), Sea of Kara! Cape Wankarema! 



Var. minor CtRUN. (1884). — L. 0,o8 to 0, 11; B. 0,oi6 to 0,oi7 mni. Transv. and obi. strife 

 ■^V:,o in 0,01 mm. — Grun. Franz Josephs Land D. p. 105 PL I f. 57. Per. Nl f. 11. 



Var. rhomhoides Cl. (1880). — V. rhomboid-lanceolate, acute. li. O.os.i to O.isr. ; B. 0,02 to 

 0,03 mm. Median line central, almost straight. Transv. and obi. stritc -' .^.,, --/o^, '■^''/j-, in 0,01 mm. 



— P. rhomh. Cl. A. D. p. 14, 54, PL IV f. 73. Per. VI f. 14. 



Marine: Sea of Kara! Cape Wankarema! 



Var. latiuscula Per. (1891). — V. lanceolate, slightly sigmoid, with somewhat obtuse ends. 

 L. 0,16; B. 0,026 mm. Transv. and obi. strife -72,, in 0,oi mm. — P. lafiusndum Per. p. 15 

 PL VI f. 12. 



Marine: North Sea (Per.). 



P. Stnxhergii, remarkable for its very fine oblique strife, is not related to P. ddicu- 

 hilum, but to P. arntion. The var. rhomboides seems to connect it with P. angidatum v. 

 sf rig OHO. 



K. Vet. Akad. Handl. Band 2<j. X:o 2. 6 



