166 t. t. cleve on some fossil marine diatoms. 



Naviculace^:. 



Navicula aspera, var. intermedia, Grim, in A. Schm. Atl., PI. 48, 

 f. 14, 15 (1876). Franz. Josef's Land Diatomeen, p. 56, PI. 

 A., f. 20 (1884). One of the Tegel specimens measures *2 mm. in 

 length and -034 mm. in breadth, and has 7 striae in -01 mm. ; 

 the stria? are nearer to the median line on one side than the other. 

 This form is found living in the Arctic seas. 



N. nitescens (Greg.), Diat. of CI., pp. 15 and 69, PI. 1, f. 16 

 (1857). A. Schm. Atl., PI. 7, f. 38 (1875). (JV. Smithii var.) 

 One specimen, closely agreeing with, the figure in the Atlas, 

 measures -12 mm. in length, and -002 mm. in breadth, and has 6 

 striae in -01 mm. This species is also found recent in most seas. 



JV. prcetexta, Ehr. Pinnularia prcetexta, Elir. I\Ib. 1840. 

 Several specimens, all agreeing very closely with the figures in 

 A. Schm. Atl., PI. 3, f. 31-33. Length, -1--24 mm. ; breadth, 

 •06--12 mm. ; stria?, 7-7*5 in -01 mm. 



Found recent in most marine gatherings. 



JV. Lyra, var. elliptica. A. Schm. Atl., PI. 2, f. 29, and PI. 3, 

 f. 11 (1875). Van Heurck. Syn., PI. 10, f. 2. One specimen 

 (len. '115, br. -075 mm.; stria?, 6 in -01 mm.) closely resembles 

 the figure in the latter work. Common in recent marine 

 gatherings. 



JV. inhalata. A. Schm. Atl., PI. 2, f. 30 (1875). One specimen 

 (length -14, breadth -08 mm.) has 9 stria? in -01 mm. The speci- 

 men from Samoa, as figured in the Atlas, has 13 stria? in -01 mm. ; 

 in other respects the Tegel specimen agrees well with it. 



N. gemmata, Grev., Edin. N. Phil. Jour., x., p. 30, PI. 4, f. 7 

 (1859). JV. spectabiUs, Grun., Verb., p. 533, PI. 3, f. 11 (1860). 

 N. Giunowii, Kab. Flor. Eur. Alg.,p. 203 (1864). JV. gemmata, 

 var. biseriata, Grun., Novara Alga?, p. 100, PI. 1 A., f. 16 

 (1867). JV. gemmata, var. spectabiUs, A. Schm. Atl., PI. 8, f. 38 

 (1875). N. grunowii, A. Schm. Atl., PI. 70, f. 73 (1881). 

 Three specimens •14--20 in length and ■05- , 052 mm. in breadth ; 

 stria? 3 in -01 mm. One of the specimens is slightly constricted in 

 the middle, and very much resembles JV. pristioplwra, Janisch in 

 A. Schm. Atl., PI. 70, F. 72. N. gemmata is found living in 

 warm seas, as the Mediterranean, Ived Sea, the West Indies, 

 California, &c, and in a fossil state in Californian guano and the 

 Nankoori deposit. 



JV. bomboides, A. Schm. Atl. See Diat. PI. 1, f. 2 (1874). A. 



