KONGL. SV. VET. AKADKMIENS HANDLINGAR. BAND 26. N:0 2. 117 



13. €f. macrum W. Sm. (1853). — V. narrow, lanceolate, abruptly attenuated into very 

 long and narrow beaks, curved in contrary directions. L. 0,2 to 0,2?; B. 0,oi mm. Median line 

 central. Transv. strise 27 to 28 in 0,oi mm., longitudinal more than 30 in 0,oi mm. — Pleur. 

 macr. W. Sm. B. D. I p. 67 PL XXXI f. 276. V. H. Syn. p. 119 PI. XXI f. 9. Pek. VIII f. 41. 



Marine: Sea of Kara (Grun.), North Sea! Mediterranean Sea (Grrun.). 



14. G. prolongatum W. Sm. (1852). — V. narrow, lanceolate, gradually attenuated into 

 long beaks, curved in contrary directions. L. 0,ii to 0,25; B. 0,oo5 to O.ois mm. Transverse 

 strise 21 to 22 in 0,oi mm., longit. finer. — Pleur. prol. W. Sm. Ann. Mag. Nat. Hist. [2] IX 

 p. 9 PI. II f. 7. B. D. I p. 67 PI. XXII f. 212. Per. VIII f. 39. 



Marine: North Sea! Balearic Islands! 



Var. dosteroides Grun. (1884). — Beaks turned in the same directions. Transv. striae 22 in 

 0,01 mm. — Pleur. prol. var. dosteroides Grun. Franz Josephs Land D. p. 105 (53) PI. I f. 58. 

 Per. VIII f. 40. 



Marine: Coasts of England (Grun.). 



. 15. G. tenulssimuin W. Sm. (1853). — V. very narrow, linear-lanceolate, slightly sigmoid, 

 acute. L. 0,ii to 0,22; B. 0,oo5 to 0,oi5 mm. Median line central. Transv. strise 18 to 22 in 0,oi 

 mm. longitud. finer. — Pleur. tenuiss. W. Sm. B. D. I p. 67 PL XXII f. 213. Per. VIII f. 13. 



Marine: Sea of Kara! East coasts of England ("W. Sm.), Triest! California! 



Var. subtilissima Grun. (1880). — L. 0,137; B. 0,oo65 mm. Transv. strise 27 in 0,oi mm. — 

 Pleur. ten. var. suit. Grun. A. D. p. 58. 



Marine: Sea of Kara (Grun.). 



Var. hyperborea Grun. (1880). — V. linear, sigmoid. L. 0,o84 to 0,094; B. 0,oo6 to 0,oo7 

 mm. T.S. : L.S. 21/^3, 22/,^ in 0,01 mm. — Pleur. ten. var. hyperh. Grun. A. D. p. 58 PL IV f. 77- 

 Per. VIII f. 14. 



Marine: Sea of Kara (Grun.). 



Gyros, tenuissimum connects G. prolongatum with G. Spencerii by the Var. hyperborea. 



16. G. Spencerii W. Sm. (1852). — V. linear-lanceolate, sigmoid, obtuse. L. 0.o78 to 0,22; 

 B. 0,012 to 0,025 mm. Median line central. Transv. strise more distant than the longitudinal. 

 T.S. : L.S. 'V22. ■V24. ^^/•'4 i" 0>oi mm. — Pleur. Spencerii W. Sm. Ann. Mag. Nat. Hist. [2] IX 

 p. 1.2 PL II f. 15. B. "d. I p. 68 PL XXII f. 218. " P. Spenc. var. Smithii Grun. A. D. p. 59. 

 V. H. Syn. p. 118 PL XXI f. 15. Per. VIII f. 21, 23. P. Spenc. var. Arnottii Grun. A. D. p. 59, 

 P. Spenc. var. borealis Grun. A. D. p. 60. Per. VIII f. 15. P. S^jenc. var. Antillarum Grun. A. D. 

 p. 60. P. Spenc. var. curvula Grun. A. D. p. 60. V. H. Syn. p. 118 PL XXI f. 3, 4, 5. Per. 

 Vin f. 20, 24. 



Brackish water: Spitsbergen! Sea of Kara! North Sea! Saxony! Canada! New York! "West 

 Indies! Bombay (Grove Coll.)! 



Var. exilis Grun. (1880). — L. 0,o5 to 0,055; B. 0,oo7 mm. Transv. striae 28 to 29 in 0,oi 

 mm. — P. Spenc. var. exilis Grun. A. D. p. 60. Per. VIII f. 25. 



Brackish water: Normandy (Grun.), Tasmania! 



Var. minutula Grun. (1880). — L. 0,o6; B. 0,oi mm. T.S. : L.S. ^Vj.,, "V26 in 0,oi mm. — 

 P. Spenc. var. min. Grun. A. D. p. 60. 



Brackish water: Elbe (Grun.). 



Var. nodifera Grun. (1880). — V. linear, slightly sigmoid, obtuse. L. 0,o6 to 0,i; B. 0,oii 

 mm. Median line central. Central nodule surrounded by an elongated, oblique area. Transv. 

 strise slightly radiate in the middle. T.S. : L.S. "/jj, ^o/,^ in 0,01 mm. — P. nodif. Grun. A. D. 

 p. 59. P. Spenc. var. nod. V. H. Syn. p. 118. PL XXI f. 13. Per. VIII f. 26. 



Fresh water: Mouth of Elbe (Grun.), Belgium (V. H.), Samoa (Grun.). 



