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



44. M. elegans Lewis (1865). — V. lanceolate, subacute or subrostrate. L. 0,o66; B. 0,o26 

 mm. Loculi 3 to 7 in 0,oi mm., delicate, frequently rudimentary, forming a band along the whole 

 margin. Median line almost straight, or very slightly undulating. Central area very small, or 

 indistinct. Striai about 15 in 0,oi mm. almost parallel throughout, punctate; puncta about 15 

 in 0,0 1 mm. forming longitudinal rows. — Proced. Acad. NaL Sc. Philadelphia 1865 p. 13 PI. I 

 f. 9. — Grun. Foss. D. Ost. Ungarns p. 150 PI. XXIX f. 20. A. S. Atl. CLXXXVI f. 19, 20. 



Marine: Atlantic coast of U. St.! Java! Pensacola! Foss. Bory, Hungary! 



45. M. paradoxa Grun. (1878). — V. linear-lanceolate, rostrate. L. 0,o5.'); B. 0,oi4 mm. 

 Loculi 4 in 0,oi mm. equal, forming a band at some distance from the margin, and ending at a 

 considerable distance from the extremities. Striae 26 to 29 in 0,oi mm. — Cl. M. D. N:o 153. 

 M. Seychellensis Grun. Casp. Sea Alg. p. 14. 



Marine: Corsica (Grun.), Seychelles (Grun.). 



This species is unknown to me, having failed in finding it in Cl. M. D. N:o 153. The 

 above description is from a sketch sent by Grunow, who does not indicate whether the strife are 

 longitudinal, straight, or oblique, for which reason its place in the system is uncertain. 



46. M. erytlira>!a Grun. (1860). — V. lanceolate with acuminate or apiculate ends. L. 0,04 ; 

 B. 0,0 1 to 0,0 1.3 mm. Loculi about 12 in 0,oi mm., forming a band interrupted in one or two 

 places by one, to three, larger loculi. Median line undulating. Areas indistinct. Striie 21 inO.oi 

 mm. almost parallel, punctate; puncta forming undulating longitudinal rows, about 14 in 0,oi mm. 

 — Verb. 1860 p. 577 PI. VII f. 4. M. J. 1877 p. 174 PL CXCIV f. 12 to 14. A. S. Atl. CLXXXVI 

 f. 25, m. - M. hiillata A. S. Atl. CLXXXVI f. 36 (1893). 



Marine: Mediterranean, Adriatic and Black Seas! Red Sea (Grun.), Honduras (Grun.), Ba- 

 hamas (Grove Coll.)! 



Var. hioccllata Grun. (1877). — The larger loculi in the middle of the band. Striae 24 in 

 0,01 mm. — M. J. 1877 1. c. f. 15. 



Marine: Honduras (Grun.). 



Var.? infcrnq^fa Hantzch (1862). — Larger loculi 4 to 6. — M. inter. Hantzsch Ost Tnd. 

 Arch. D. p. 20 PL VI f. 5. A. S. Atl. CLXXXVI f. 37. 



Marine: East Indies (Hantzsch), Nicobar Islands (Grun). 



47. M. constricta Cl. (1892). — V. elongated, with cuneate ends, constricted in the middle. 

 L. 0,06; B. 0,0 11 at the constriction 0,oo65 mm. Loculi 6 in 0,oi mm. of equal size and with 

 straight interior margins. Median line undulating. Central area very small. Striae 21 in 0,oi 

 mm. transverse, punctate; puncta about 20 in 0,oi mm. forming undulating longitudinal rows. — 

 Diatomiste I p. 159 PL XXIII f. 5. 



Marine: Java! 



48. M. flexuosa Cl. N. Sp. — V. linear to elliptical with rostrate to acuminate ends. 

 L. 0,o.s to 0,045; B. 0,011 to 0,01 mm. Median line strongly sinuose. Loculi 7 to 8 in 0,oi mm. 

 of equal size, quadrate, forming a band ending near the apices. Central area very small, orbicular. 

 StricE 16 to 20 in 0,oi mm. parallel, of coarse elongated puncta, not forming straight lines. — 

 PL II f. 12. 



Marine: Pithy usian Islands! Mediterranean! 



This small sjjccies is remarkable for the strong flexure of its median line, near the central 

 nodule. 



49. M, cu8pi(lata Cl. (1893). — V. elliptical, apiculate. L. 0,o26; B. 0,oi mm. Median line 

 strongly flexuose. Axial and central areas indistinct. Loculi 6 in 0,oi mm. equal, quadrate, 

 forming a marginal band, ending below the extremities of the valve. Strife 25 in 0,oi mm., pa- 

 rallel, not distinctly punctate. — Diatomiste II p. 16 PL I f. 18. 



Marine: Bahamas (Grove Coll.)! 



