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



5. C. cruciata Pant. (1886). — Outline elliptical. L. 0,o3 to 0,o46; B. Ojoa to 0,027 mm. 

 Upper V. with finely striate margin (15 striae in 0,oi mm.). Axial area lanceolate, in the middle 

 dilated to a fascia. Strise 8 to 9 in 0,oi mm. composed of large, distant puncta, arranged in 

 longitudinal, undulating rows. — Pant. I p. 31 PI. XVI f. 148. 



Marine: Ceylon (Le Tourneur Coll.)! Hungary, fossil (Pant). 



6. €. gibbocalyx Brun. (1891). — Outline broadly elliptic-lanceolate. Ends subcuneate. 

 L. 0,032 to 0,045; B. 0,024 to 0,o32 mm. Upper V. with narrow, linear-lanceolate axial area. 

 Striae 7 in 0,oi mm., composed of few, large puncta, and ending at the margin in large costse 

 forming a rim. Lower V. with straight median line, ending in the conical and elevated extremities. 

 Central pores distant. Axial area narrow. Central area rounded, large. Striae about 9 in 0,oi 

 mm., radiate throughout, composed of distinct puncta, 8 to 12 in 0,oi mm., becoming smaller 

 towards the median line and arranged in longitudinal rows, more or less parallel with the margin. 

 Margin of the valve finely striate (strise 16 to 22 in O.oi mm.). — D. especes nouv. p. 17 PI. 

 XVIII f. 4. A. S. Atl. CXC f. 35? CXCIII f. 54 to 55. 



Marine: Zanzibar (Brun), Manilla (Deby Coll.)! Matiritius (Brun Coll.)! Galapagos Islands! 

 West Indies, Tortola! 



This is a very remarkable and isolated species. Both valves have not been seen in contact, 

 so that it is somewhat doubtful whether the upper valve, which has some resemblance to Cocc. 

 Scutellum, really corresponds to the valve here described as the lower. 



7. C. grata A. S. (1894). — Outline elliptic-lanceolate. L. 0,04 to 0,o6; B. 0,03 to 0,o44 

 mm. Upper V. with a broad, lanceolate axial area. Strise 10 to 11 in 0,oi mm. composed ol 

 distinct puncta, about 16 in 0,oi mm. Lower V. with an annulus of rudimentary loeuli, about 5 

 in 0,01 mm. Median line straight, reaching to the margin. Striae 15 in 0,oi mm. radiate, finely 

 punctate, becoming fainter towards the median line. — PL 11 f. 30, 31. A. S. Atl. CXC f. 36. 

 CXCII f. 65 



Marine: Campeachy Bay! Mediterranean Sea! Grip in Norway! 



C. andesitica Pant. (Ill PL X f. 170; 1893) appears to be akin to this species or to 

 Gi dirupta. 



8. C. distans (Greg. 1857?) A. S. 1874. — Outline elliptical to elliptic-lanceolate. L. 0,o5 

 to 0,07; B. 0,03 to 0,04 mm Upper V. with narrow, lanceolate axial area. Puncta elongated, 

 forming sUghtly radiate transverse (about 7 in 0,oi mm.) and undulating longitudinal rows (about 

 4 in 0,01 mm.). Lower V. unknown. — N. S. D. PL III f. 22, 23 (1874). Atl. CXCIII f. 29, 36, 

 40. C. dist. forma minima Pbrag. D. de Villefranche p. 37 PL II f. 13. 



Marine: Arctic America! Sea of Kara! North Sea! Mediterranean Sea! Madagascar! Java! 

 Florida! Campeachy Bay! 



C. distans Greg. (M. J. Ill p. 39 PL IV f. 9; 1855) is a mere variety of C. Scutellum. 

 C. distans Greg. (T. M. J. 1857 Vol. V PL 1 f. 25 and D. of Clyde p. 490 PL IX f. 23) seems not 

 to differ from C. granulata Greg. The species I consider as C. distans has been figured by A. Schmidt, 

 but is a small variety, named by Peragalo var. minima. Schmidt figures one specimen with median 

 line and central nodule, but this fig. certainly represents an entire frustule. I have seen in a 

 gathering from Java an entire frustule, but the coarse structure of the upper valve prevented me 

 from examining the lower one, which seems to be very delicate. C. lamprosticta Greg. (T. M. S. V. 

 p. 69 PL I f. 28, 1857) represents either this species or a form of Cocc. Scutellum. 



9. C. DiscuUis ScHUM. (1864). — Upper V. broadly elliptical. L. 0,02; B. 0,oi5 mm. Axial 

 area lanceolate. Strise 8 in 0,oi mm. composed of two to four large elongated puncta. Lower V. 

 unknown. — Navicula Disculus Sohum. Preuss. D. I Nachtr. p. 21 f. 23. 



Fresh or slightly brackish water: Domblitten and Spirding, Prussia, fossil! Sweden, (baltic 

 deposits from the Ancylus-epoch)! 



