152 p. T. CLEVE, SYNOPSIS OF THE NAVICULOID DIATOMS. 



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

 rostrate-capitate. L. 0,o27 to 0,g53; B. 0,oi to 0,oi6 mm. Loculi 6 to 8 in 0,oi mm. of equal 

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

 19 in 0,01 mm., almost parallel, or radiate .at the ends, punctate; puncta about 24 in 0,oi mm. 

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

 V. H. Syn p. 70 PI. IV f. 13. M. laneeolata var. Gkun. Verb. 1860 p. 576 PI. VII f. 6. M. lanceo- 

 lata var. hungariea Pant. II p. 41 PL VII f. 136 (1889). 



Brackish water: Baltic (from Tornea to Rilgen)! Saxony! Caspian Sea (Grun.), England! 

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



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

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

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



Fresh water: Spitsbergen! Grulf of Bothnia! Iceland! England! Belgium (V. H.). 



Var. laneeolata GtRUN. (1878). — V. linear lanceolate, slightly rostrate. L. 0,045 to 0,o5; 

 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. Ill PL XXXVn 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, l4. 

 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. 0,0125 

 mm. Central area very small. Loculi 8 in 0,oi mm. Strife 18 to 19 in 0,oi 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. 0,06.5; 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,oi mm. coarsely punctate; puncta 17 in 0,oi 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,o4: B. 0,ooi mm. Central 

 nodule transversely dilated into a stauros. Loculi 6 to 8 in 0,oi mm. Strise 27,5 in 0,ni 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,oi mm. of equal size, forming a band, 

 which ends at some distance from the ends. Strife 20 in 0,oi mm. radiate throughout, in the 

 middle alternately longer and shorter, finely punctate. — Frustulia elliptica Ag. in Kutz. Syn. 

 p. 10. M. Bansei var. elliptica V. H. Syn. PL IV f. 19. Dannp. Baltic D. PL IV f. 19. M. obtusa 

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



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

 (Banos, Tesalia)! 



Var. australis Cl. — L. 0,032 to 0,o36; B. 0,oi to 0,oi3 mm. Loculi 9 in 0,oi mm. Strise 

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



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



Var. Bansei Thw. (1856). — V. narrow, linear with cuneate ends. L. 0,035 to 0,04; B. 0,oi 

 to 0,012 mm. Strise 18 in 0,oi mm., finely punctate. — M. Bansei Thw. Sm. B. D. II p. 64 



