KONGL. SV. VET, AKADEMIENS HANDLINGAR. BAND 26. N:0 2. 37 



and obi. strise i*/,, (2o/,g Pbeag.) in O.oi mm. — Beun. and Temp. D. foss, du Japon p. 48 PI. IX 

 f. 9. Pek. p. 11 pi. IV f. 14. 



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



11. P. pelagicum Per. (1891). — V. scarcely sigmoid, lanceolate, acute. L. 0,i6 to 0,17; 

 B. 0,023 to 0,025 mm. Median line strongly sigmoid. Median oblique striae not more distant than 

 the others. Transv. and obi. striae ^Viq) lio- Angle about 65°. — P. acutum var. australica and 

 P. pelagicum Per. p. 7 PI. Ill f. 3. 



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



This species was mistaken by me for P. acutum var. austral., which is more like the fig. 2 

 PI. Ill in Per. Monograph. It seems nevertheless akin to P. acutum, and to be related to that 

 species as P. naviculaceum is to P. Normanii. 



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

 tracted acute ends. L. 0,o8 to 0,i; B. 0,023 to 0,025 mm. Median line flexuose. Transv. and obi. 

 strise equidistant 20 to 22 in 0,oi mm. Angle about 60°. — Donk. T. M. S. 1858 p. 22 PL III 

 f. 4. G-RUN. A. D. p. 53. Per. p. 12 PL V f. 14. P. transversale /J Roper M. J VI p. 25 PL III 

 f. 11. P. cestuarii Per. V. f. 13? 



Marine: Coasts of Scotland £ind England! 



Var. tahitensis Grdn. (1880). — L. 0,ii8; B. 0,oi6 mm. Striae 22 in 0,oi mm. t— P. lane, 

 var. tahit. Grun. A. D. p. 53. 



Marine: Tahiti (Q-run.). 



The median striae of P. lanceolatum are a little more distant than the terminal, which 

 points to an affinity with P. naviculaceum. On the other hand it is nearly related to P. aistuarii, 

 into which species it seems to graduate. 



13. P. miirinum 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 

 rtodule rounded. Transv. and obi. striae 21/,^, 23/,^^^ 2*/^^^ 20/^^ (Barbados). — Donk. T. M. S. VI 

 p. 22 PL III f. 3. Per. Ill f. 11. P. mar. var. Antillarum Per. p. 8 PL III f. 19. P. mar. var. 

 harhadensis 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,o68 mm. Central nodule quadrate. Transv. 

 and obi. stri^ »«/i4 (Per.), '%, (Per), 17,7, "-/is- — PI. 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. 0,0095 to 0,01 mm. Median line central. Transv. and obi. striae ^-'/^^ in 0,oi mm. 

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



Marine: Sea of Kara TGrun.). 



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

 0,2; B. 0,011 mm. Transv. and obi. striae 28 in 0,oi mm. 



Marinp: Cape Wankarema (Grun.). 



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

 B. 0,0675 mm. Transv. and obi. striae 25 in 0,oi mm. 



' Marine: Coast of Northumberland (Grun.). 



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

 obi. striae 2%2 in 0,oi mm. — Per. p. 13 PL V f. 19. 



Marine: Japan, fossil (Brun.). 



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

 pering from the middle to the acute ends. L. 0,i5, to 0,28; B. 0,02 to 0,03 mm. Median line 



