V2S. — Fleur. dist. W. Sm. Ann. Mag. Nat. Hist. [2] IX p. 7 Pl. 1 f. 10; B. D. I p. 67 Pl. XX 



116 v. T. CLEVE, SYNOPSIS OF THE XAVICUEOID IHATiiMS. 



Ann. Mag. N. H. [2] X p. 10 Pl. II f. 9 (1852). B. B. 1. c f. 215. V. H. Syn. p. 117 Pl. XX 

 f. 3. Pek. VII f. 4 to 7. P. att. var. caspia Grun. Casp. Sea Alg. p. ix Pl. Ilf f. 8. Pek VII i". 8. 



Presli and bracki.sli water: Sweden! Finland! England! Saxony! Belgium (V. H.), France! 

 Baltic! North Sea! Caspian Sea (Grun.). 



Var. Scalprum Gaill. a. Turp. (1827). — L. 0, 12 to 0,1.5; B. 0,ui'j mm. T.S. : L.S. "/is. 

 ",',4. — Nav. Sccäprum Gaill. a. Turp. Mém. du Museum XV Pl. X, XI f. 3 (accord. to Kiitz.). 

 P. acuminatum W. Sm. B. D. I p. 66 Pl. XXI f. 209. Grun. A. D. p. 55. Per. p. 17 Pl. A^II f . 3- 

 Pl. Kochii Pant. Ill Pl. IX f. 153 (1893)?? 



Brackisli and marina: North Sea! 



10. G. litoralo "W. Sm. (1852). — V. sigmoid, lanceolate, with atteuuate, slightly ro.strate 

 ends. L. 0, 11 to 0,19; B. 0,022 to 0, 045 mm. Median line sigmoid, central. Longit. strite very 

 strong and distant. T.S. : L.S. ''/lo in 0,oi mm. — P. litorale W. Sm. Ann. and Mag. N. Hist. 

 [2] IX p. 10 Pl. II f. 8. B. D. I p. 67 Pl. XXII f. 214. Per. VII f. 1. 



Marine: North Sea! English Channel (AV. Sm.), Mediterranean Sea (Per.). 



11. G. distortum W. Sm. (1852). — V. lanceolate, slightly sigmoid. Ends more or less 

 abrnptly produced into short, obtuse beaks, turned in contrary directions. L. O, o 7 to 0,12; B. 0,oi" 

 mm. Median line sigmoid, central. Transv. strife more distant than the longit. T.S. : L.S. -^.'jj. 



f. 210. Per. VIII f. 82 



Marine: Spitzbergen! North Sea! English Channel (W. Sm.), lonian Archipelago (Grun.), 

 Cameroon, Africa! 



Var. Parlceri Harrlson (1860). — L. 0,08 to 0,15; B. 0,01.5 to 0,02.0 mm. T.S. : L.S. '^o 

 (Grun.), 20/^^^ ii/^^^ 23/^^ in 0,oi mm. — Pleur. Park Harri. M. J. 1860 p. 104. Grun. A. D. p. 57* 

 V. H. Syn. p. 118 Pl. XXI f. 10. Per. VIII f. 33. 



Fresh and brackish water: Baltic! England! Belgium! 



Var. stauroneoides Grun. (1880). — Central nodule transversely dilated. T.S. : L.S. -'•/.j, 

 0,01 mm. — Pleur. Parlc. var. atauron. Grun. A. D. p. 57. 



Brackish water: Hudson River (Grun.). 



12. G. Fasciola Eiib. (1839). — V. lanceolate, attenuated into long, linear beaks, curved 

 in opxjo.site directions. L. 0,o!) to 0,15; B. 0,oi5 to 0,024 mm. Median line central, straight in the 

 middle- of the valve. T.S. : L.S. -'/o^, -V.,2 in 0,oi mm. — Ceratoneis Fasciola Ehb. Abh. 1839 

 (accord. to Chase). Pleur. Fasciola W. Sm. B. D. I p. 67 Pl. XXI f. 211. Grun. A. D. p. 58. 

 V. H. Syn. p. 119 Pl. XXI f. 8. Hendry T. M. Soc. 1862 X p. 152. Per. VIII f. 36 to 38. 



Marine: Spitsbergen! North Sea! California! Barbados! 



Var. sulcata Grun. (1880). — Longitudinal stria- strong. T.S. : L.S. '^,5 (Grun.), '•^",,;, -^,5 

 in 0,0 1 mm. — P. {Fasc. var.'/) sulcafum Grun. A. D. p. 55 Pl. IV f. 75. V. H. Syn. XXI f. 7. 

 Per. VIII f. 43. 



Marine: Sea of Kära (Grun.), Spitsbergen! Firth of Tay (Grove), Älouth of Seine! 



Var. femiirostris Grun. (1880). — L. 0,i4 to l.ie; B. b,on to 0,oi2 mm. T.S. : L.S. "/ig, 

 -V2,, in 0,0 1 mm. — P (Fasc. rar.?ytenuirostris Grun. A. U. p. 55 Pl. IV f. 76. Per. VIII f. 42. 



Marine: Sea of Kära (Grun.). 



Var. arcuata Donk. (1858). — V. lanceolate. Ends more suddenly produced into long, iiarrow 

 beaks curved in contrary directions. L. 0,i to 0,11.5; B. 0,oi2 mm. Median line central, straight. 

 Transv. stria; 24 to 25 (Grun.) in 0,oi mm.; longitudinal finer. — Pleur. arcuat. Donk. T. M. S. 

 VI p. 25 Pl. III f. 10. Per. VIII f. 34, 35. 



Marine: Coast of Sweden (Grun.)! England (Donk.). 



Gyros. Fasciola is intimately connected with G. distortum rar. Parkeri, and by the Var. 

 teiiuirostris, with G. macrum. 



