152 P. T. OLBVE, SYNOPSIS OP THE NAVICULOID DIATOMS, 



37. M. Smithii Thwaites (1848 fide W. Sm.). — V. lanceolate, more or less rostrate, or 

 rostrate-capitate. L. 0, 027 to 0,o.'j3; B. 0, 01 to 0,oi6 mm. Loculi 6 to 8 in 0, 01 mm. of equal 

 size. qiiadrate, forming a band ending at some distance from the ends of the valve. Strise 18 to 

 19 in 0,01 mm., almo.st parallel, or radiate at the ends, p^mctate; pnncta about 24 in 0, 01 mm. 

 forming longitudinal rows. Central area small, rounded. — W. Sm. B. D. II p. 65 Pl. LIV f. 341. 

 V. H. Syn p. 70 Pl. IV f. 13. M. lanceolaia var. Grun. Verh. 1860 p. 576 Pl. VII f. 6. M. lanceo- 

 lata var. hungarica Pant. II p. 41 Pl. VII f. 136 (1889). 



Brackisli water: Baltic (from Torneå to Riigen)! Saxony! Caspian Sea (Grun.), England! 

 Australia! Tasmania! Fossil: Hungary (Czekehaza! etc). 



Var. lacustris Grun. (1878). — Central area transverse, moderately large. Strise 15 to 16 

 in 0,01 mm., slightly radiate. — Caspian Sea Alg. p. 14. V. H. Syn. Pl. IV f. 14. ilf. antiqua 

 ScHUM. Preuss. D. p. 190 Pl. IX f. 58 c, e (1862). 



Fresh water: Spitsbergen! Gnlf of Botlmia! loeland! England! Belgium (V. H.). 



Var. lanceolafa Grun. (1878). — V. linear lanceolate, slightly rostrate. L. 0,04 5 to 0,0.5; 

 B. 0,008 mm. Loculi 6 in 0,oi mm. Strise 18 to 19 in 0,oi mm. radiate. — Cl. M. D. N:o 161. 

 M. Smithii Pant. III Pl. XXXVII f. 520. 



Brackish water: Gothland! 



Var. amphicephala Grun. (1878). — V. with capitate ends. — M. Smithii /? W. Sm. M. Sm. 

 var. amphic. Grun. in Cl. M. D. N:o 161. V. H. Syn. Pl. IV f. 27. A. S. Atl, CLXXXV, 13, 14. 

 M. capitata Grev. M. J. N. S. II p. 235 Pl. X f. 11, 12? 



Brackish: Baltic! England, Scotland Sm., Morocco (Atl.). 



Var. intermedia Grun. (1878). — V. lanceolate, slightly rostrate. L. 0,o32 to 0,037; B. 0,012.5 

 mm. Central area very small. Loculi 8 in 0, 01 mm. Strife 18 to 19 in 0, 01 mm., .somewhat 

 radiate. — Caspian Sea Alg. p. 13. 



Brackish: Caspian Sea (Grun.), South Africa (Cl. M. D. N:o 197), Karand, Hungary, fossil ! 



Var. abnormis Grun. (1878). — V. lanceolate, rostrate. L. 0,065; B. 0,02 mm. Loculi 6 in 

 0,01 mm. in a band at some distance from the margin. Central nodule slightly transversely 

 dilated. Strise 17 in 0, 01 mm. coarsely punctate; puncta 17 in 0, 01 mm. — Casp. Sea Alg. p. 14. 

 Icon. n. Pl. II f. 17. 



Brackish: Caspian Sea (Grun.). Marine: Hungary, Karand, fossil (Deby Coll.). 



Description from a specimen from Karand. 



Var. doljensis Pant. (1886). — V. elliptic-lanceolate. L. 0, 03 to 0,04: B. 0, 001 mm. Central 

 nodule transversely dilated into a stauros. Loculi 6 to 8 in 0, 01 mm. Stria?. 27,5 in 0, 01 mm. 

 parallel (radiate on the figure given by Pant.). — Pant. I p. 22 Pl. X f. 88. 



Brackish: Dolje, Hungary, fossil (Pant.). 



38. M. elliptica Ag. (1833). — V. elliptical. L. 0,022 to 0,045; B. 0,oi to 0,oi8 mm. 

 Central area orbicular, small, but distinct. Loculi 7 to 8 in 0, 01 mm. of equal size, forming a band, 

 which ends at some distance from the end.s. Striiu 20 in 0,01 mm. radiate throughoiit, in the 

 niiddle alternately longer and shorter, finely punctate. — Frus-tidin c.llijttica As. in Ivutz. Syn. 

 p. 10. M. Dansei var. elliptica V. H. Syn. Pl. IV f. 19. Dannf. Baltic D. Pl. IV f. 19. M. ohtnsa 

 Pant. II p. 41 Pl. VII f. 134 (1889). 



Brackish water: Sweden (Baltic, extremely abundant)! Saxony! England! Belgium! Ecuador 

 (Banos, Tesalia)! 



Var. austrulis Cl. — L. 0, 032 to 0,o3fi; B. 0,oi to 0,013 mm. Loculi 9 in O, di mm. Strise 

 14 to 15 in 0,01 mm. coaivsely punctate; puncta about 16 in 0, 01 mm. 



Slightly brackish water; Mitchell Rivci', Australia! Rioja, rep. Argentina! 



Var. Dam^ci Tiiw. (1856). — V. narrow, linear with cuneate ends. L. 0,035 to 0,04; B. 0,01 

 to 0,012 mm. Striiii 18 in o.ui mm., Iincly punctate. — 71/. Davsci Tiiw. Sm. B. D. Il p. (i4 



