KONGL. SV. VET. AKADEMIENS HANDLINGAH. BAND 26. >J:0 2. 37 



and obl. strise iä/,5 (^"/is Perag.) in O.oi mm. — Brun. and Temp. D. foss. du .Japon p. 48 Pl. IX 

 f. 9. Per. p. 11 Pl. IV f. 14. 



Marine: Hungary, Kekkö! Japan (Brun.). 



11. P. pelagicum Per. (1891). — V. scarcely sigmoid, lanceolate, acute. L. 0,io to 0,17; 

 B. 0,023 to (),02r> mm. Median line strongly sigmoid. Median oblique strife not more distant tlian 

 the otliers. Transv. and obl. strire. -'/,<,, —/^o- Angle about 65°. — P. acutum var. aiistralica and 

 F. pdagicum Per. p. 7 Pl. III f. 3. 



Marine (pelagic): Bay of Bengal! Java (Deby CoU.)! 



This species was mistaken by me for P. acutum var. ausfral., wliich is more like tlie fig. 2 

 Pl. III in Per. Monograpli. It seems nevertheless akin to P. acutmn, and to be related to that 

 species as P. navicidaceuni is to P. Normanii. 



12. P. lanceolatum Donk. (1858). — V. scarcely sigmoid lanceolate, with slightly pro- 

 tracted acute ends. L. O, os to 0,i; B. 0,023 to 0, 025 mm. Median line flexn.o.se. Transv. and obl. 

 strise equidistant 20 to 22 in 0,oi mm. Angle about fiO'. — Donk. T. M. S. 1858 p. 22 Pl. III 

 f. 4. Grun. a. D. p. 53. Per. p. 12 Pl. V f. 14. P. transversale /S Roper M. J VI p. 25 Pl. III 

 f. 11. P. (Bstuarii Per. V. f. 13? 



Marine: Coasts of Scotland and England! 



Var. iahitensis Grun. (1880). — L. 0,ii8; B. 0,oi6 mm. Strise 22 in 0,oi mm. — P. lanc. 

 var. taliit. Grun. A. D. p. 53. 



Marine: Tahiti (Grun.). 



The median stria; of P. lanceolatum are a little more distant tban the terminal, which 

 points to an afSnity with P. naviculaceum. On the other hand it is nearly related to P. af.stuarii, 

 into which species it seems to graduate. 



13. P. niiiriiiuiii Donk. (1858). — V. very slightly sigmoid, lanceolate, with obtuse ends. 

 L. 0,11 to 0,18; B. 0,02 to 0,03 mm. Median line undulating, excentric towards the ends. Central 

 nodule rounded. Transv. and obl. striai -'U^, -y^„, -y.,3, 2V21 (Barbados). — Donk. T. M. S. VI 

 p. 22 Pl. III f. 3. Per. III f. 11. P. mar. var. Äntilla^rum, Per. p. 8 Pl. III f. 19. P. mar. var. 

 barbadensis Grun. A. D. p. 50. 



Marine: Coasts of England and Scotland! Port Jackson! Labuan! Barbados! 

 Var. italica Per. (1891). — L. 0,3 to 0,32; B. 0,o08 mm. Central nodnle quadrate. Transv. 

 and obl. striffi •s/,^ (Per.), 's/^. (Per), "/j,, '»•■7^^. — Fl. ital. Per. p. 8 Pl. III f. 10. 

 Marine: Gulf of Naples! Adriatic! 



14. P. Clevei Grun. (1880). — V. slightly sigmoid, very narrow, with attenuate ends. L. 

 0,14 to 0,21; B. 0,oo9.T to 0,01 mm. Median line central. Transv. and obl. strise '^■'A,, in 0,oi mm. 

 — Grun. A. D. p. 52 Pl. III f. 70. Per. V. fig. 17, 18. 



Marine: Sea of Kära ("Grun.). 



Var. sibirica Grun. Ms. — V. gradually tapering from the middle to the subacute ends. L. 

 0,2; B. 0,011 mm. Transv. and obl. strise 28 in 0,oi mm. 



Marine: Cape Wankarema (Grun.). 



Var. cornuta Grun. Ms. — V. nai-row lanceolate, attenuate into long narrow beaks. L. 0, 12; 

 B. 0,007 5 mm. Transv. and obl. strise 25 in 0, 01 mm. 



Marine: Coast of Northumberland (Grun.). 



Var. fossilis Brun. (1891). — Similar to var. cornuta. L. 0,2; B. 0,oi5 mm. Transv. and 

 obl. strise ^ä/^, in 0,oi mm. — Per. p. 13 Pl. V f. 19. 



Marine: Japan, fossil (Brun.). 



15. P. (lellcatuluiii W. Sm. (1852) — V. narrow lanceolate, slightly .sigmoid, gradually ta- 

 pering from the middle to the acute ends. L. O,!.-), to 0,28; B. 0,02 to O, os mm. Median line 



