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



This is a remarkable form, not closely connected with any other known species. Perhaps 

 Stauroneis BriUssonii Castr. (Voy. Chall. Diat. p. 24 PI. 15 fig. 4) may be the same, but the 

 figure and description of that form are insufiicient for identification. 



39. C. samoensis G-run. (1877). — V. linear to elliptic-linear, narrowed towards the ends. 

 L. 0,085 to 0,115; B. 0,018 to 0,025 mm. Axial and central areas united in a narrow, irregu- 

 larly lanceolate, space, having on each side of the central nodule a lunate or linear marking. 

 Strise 10 to 12 in 0,oi mm. slightly radiate at the ends. Longitudinal line median or submarginal. 

 — Nav. samoensis A. S. Atl. L. f. 43, 44. Nav. mammalis Castr. Chall. Voy. D. p. 30 PL XX 

 f. 2 (1886)? 



Marine: Ceylon! Amboina (Kinker Coll.), Java (Kinker Coll.)! Philippines! Labuan! Port 

 Jackson! Samoa! 



Var.? bimaculata Pant. (1889). — V. elliptic-lanceolate. L. 0,064; B. 0,oi9 mm. Area lan- 

 ceolate with markings on both sides of the central nodule. Striae 14 to 15 in 0,oi mm. Longi- 

 tudinal lines? — Nav. him. Pant. II p. 42 PL XXIII f. 346. 



Marine: Hungary, fossil (Pant.). 



40. C. sectilis A. S. (1877). — V. linear with rounded ends. L. 0,i44; B. 0,o23 mm. 

 Axial and central areas uniting in a broad linear space, with a row of puncta along the median 

 line. Strife 7,5 in 0,oi mm., parallel. Longitudinal lines submarginal. — Nav. sectilis A. S. 

 Atl. L. f. 3. 



Marine: Whatabevot, India (Atl.) Hungary, fossil (Pant.). 



Var. ioryana Pant. (1889). — L. 0,oi to 0,i3; B. 0,02 to 0,024 mm. Area with a row of 

 puncta on both sides of the central nodule. Strise 8 to 9 in 0,oi mm. Longitudinal lines margi- 

 nal or inframarginal. — Nav. Boryana Pant. II, XXVIII f. 407. 



Marine: Gulf of Naples! Bory, Hungary, fossil! Galapagos Islands (Weissflog Coll.)! 



Nav. pavida Pant. Ill PL XXX f. 438 appears to be an allied but smaller form. 



41. C. Anderssonii Cl. (1881). — V. linear, with subcuneate ends. L. 0,075; B. 0,oi9 mm. 

 Axial area narrow, dilated around the central nodule, to an orbicular space without markings. 

 Striae 6,5 to 7 in 0,oi mm., radiate at the ends, not punctate. Longitudinal lines inframarginal. 

 N. And. Cl. N. E. D. p. 11 PL III f. 28. Gal. And. Icon. n. PL VI f. 8 (Part. II PL I f. 8). 



Marine: Galapagos Islands. 



The fig. in CL N. R. D. is not quite exact, the axial area being too broad. 



42. C. Frater Cl. N. Sp. — V. convex, linear, with parallel margins and rounded cuneate 

 ends. L. 0,i; B. 0,oi2 mm. Axial and central areas united in a narrow, lanceolate space, 

 without markings. Striae 8 in 0,oi mm., smooth, slightly radiate in the middle and at the ends. 

 Longitudinal lines inframarginal. — PL III f. 26. 



Marine: Galapagos Islands! 



43. C. Spathnla Bkun (1891). — V. linear, narrowed towards the ends. L. 0,i5 to O.ie; 

 B. 0,01 to 0,012 mm. Axial area linear, very narrow; central area indistinct. Striae 12 in 0,oi 

 mm. parallel, divergent at the ends finely punctate. Longitudinal line marginal or inframarginal 

 — Nav. spat. Brun. D. Esp. n. p. 40 PL XV f. 10. 



Marine: Japan, fossil (Brun Coll.)! 



44. C. adenensis Cl. N. Sp. — V. elongated, slightly biconstricted, with cuneate ends. 

 L. 0,07; B. 0,013 mm. Axial area narrow, irregularly dilated between the central nodule and the 

 ends. Central area large, orbicular. Striae 13 (middle) to 15 (ends) in 0,oi mm., radiate in the 

 middle, transverse at the ends, not distinctly punctate. Longitudinal lines inframarginal. — 



PL in f. 33. 



Ifarine: Between Aden and Bab el mandeb (Weissflog Coll.)! 



