KONGL. SV. VET. AKADEMIENS HANDLINGAU. BAND 26. N:0 2. 41 



Var. quadrata W. Sm. (1853). — V. rliomboidal, broad, slightly sigmoid. L. 0,i9; B. 0,048 mm. 

 Median line central. Central nodule small, elongated. Transv. and obl. strige '"/is iu 0,oi mm. — 

 P. angulatum W. Sm. Ann. M. Nat. H. [2] IX p. 7 Pl. I f . 7 (1852). P. qnadr. W. Sm. B. D. I 

 p. 65 Pl. XX f. 204. Per. V f. 7, 8. P. ang. var. qiiadr. V. H. Syn. p. 115 Pl. XVIII f. 1. 



Marine: North Sea! 



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

 acute ends. L. O, is to 0,28; B. O, os mm. Ti'ansv. and obl. strite equidi.^itant, 18 to 22 in O, o i mm. 

 Angle about 60\ — P. strigosum W. Sm. Ann. M. Nat. H. [2] IX p. 7 Pl. I f. 6. B. D. I p. 64 

 Pl. XXI f. 203; XXIII f. 203. Per. A^ f. 1, 2. P. aug. var. strig. V. H. Syn. p. 115 Pl. XIX f. 2. 



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

 Brazil! Florida! 



Var. finmarchica Cl. (1884). — Gently sigmoid, more obtiise. Median line excentric towards 

 the ends. L. 0,i7 to 0,2; B. 0, 0.3 mm. Transv. and obl. strise '^isj '"''/i? ""^ *'iO' ™™- — P- Nor- 

 nianii Cl. A. D. p. 14. Grun. A. D. p. 52 Pl. III f. 67. P. Finnt. Grux. Franz Josephs Land 

 D. p. 105 (53). 



Marine: Finmark! 



Var.? convexwji Grun. (1880). — V. very convex. L. 0,225; B. 0, 02 mm. Median line .some- 

 what excentric at the ends. Transv. and obl. striee -"/is in 0, 01 mm. — P. strig. var.? convexa 

 Grun. a. D. p. 50. 



Marine: Puerto Caballo (Grun.). 



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

 to 0,014 mm. Median line nearly central. Transv. and obl. strife -"/og, -'/og, "V29 i'^ 0, 01 mm. 



— Grun. in Cl. M. D. 136. Icon. n. Pl. IV f. 19. P. cesluaril var. minuta Grun. A. D. p. 52. 

 Per. V f . 15. 



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

 Islands (Per.). 



This little form was placed by Grunow in the viciuity of P. ce.stuarii, with wliich it seems 

 to me not to have any close relation, as it differs by its uon-rostrate ends, the nearly central me- 

 dian line, and the finer striation. It may perhaps be a dwarf-form of P. angulatuni (utrigosnm). 



28. P. (Rlioicosigma) Stiixbergii Cl. and Grun. (1880). — V. narrow, lanceolate, gently 

 sigmoid, acute. L. 0, 19 to 0,38; B. 0, 028 to 0,032 mm. Median line central. Central nodule small, 

 rhomboid. Transv. and oIjI. striee ■"-%„ •^%U_., ^s/.,, in 0,oi mm. ~ A. D. p. 54 Pl. IV f. 74. Grun. 

 Franz Josephs Land D. p. 105 (53) Pl. I f. 56.' Per. VI f. 9, 10. 



Marine: Franz Josephs Land (Grun.), Sea of Kära! Cape "VVankarema! 



Var. minor Grun. (1884). — L. 0,08 to 0, 11; B. O.oie to 0, 01 7 mm. Transv. and obl. strite 

 •"/j, in 0,01 mm. — Grun. Franz Josephs Land D. p. 105 Pl. I f. 57. Per. VI f. 11. 



Var. rhomhoides Cl. (1880). — V. rhomboid-lanceolate, acute. L. O, oss to 0,135; B. 0, 02 to 

 0,03 mm. Median line central, almost straight. Transv. and obl. strise -';23, ",'24' '■^V2,i i" 0''^" ™™- 



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



Marine: Sea of Kära! Cape Wankarema! 



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

 L. 0,16; B. 0,0 2 6 mm. Transv. and obl. strite --/.lo in 0,oi mm.. — P. Jafiu^tculuiu Per. p. 15 

 Pl. VI f. 12. 



Marine: North Sea (Per.). 



P. Stt(.Thergii, remarkable for its very fine oblique strice, is not related to P. delica- 

 tulum, but to P. acntum. The var. rhomhoides seems to connect it with P. angidatmn v. 

 strigosa. 



K. Vet. Akad. Handl. Baud 2(3. N:o 2. 6 



