14 r. T. CLEVE, ON SOME NEW DIATOMS 



Length 0,093 mm. Breadth 0,024 mm. 



PI. Ill, fig. 38, '"7,. 

 Gallapagos Islands rare (Eugenie Exp.). 



Grunow has found in the Campeche Bay gathering a closely allied form, Am- 

 phiprora Campechiana Grdn. (Arct. Diat. pag. 66), which has I2V2 strife in 0,01 mm. 

 and another species with 15 striae in 0,01 mm. and obtuse ends. 



22. Navicula Pensacolce Cl. N. Sp. 



Lanceolate, with undulate margins and prominent apices. Strife indistinct, pun- 

 ctate, 15 in 0,01 mm., parallel. The portion of the valve between the keels is very 

 indistinctly striate. 



Length 0,054 mm. Breadth 0,015 mm. 

 PI. Ill, fig. 39, ^"""A- 



Florida near the Harbour of Pensacola in a gathering sent by Mr. Febiger. 



The following species is perhaps related to the species of this section : 



23. Navicula Gallnpagensis Cl. N. Sp. 



Panduriform, with cuneate ends. Stria? transverse, parallel, 15 in 0,01 mm., in- 

 distinctly punctate, reaching the median line and interrupted by a line or keel. The 

 median part of the valve around the median line is striate. 



Length 0,0670,092 mm. Breadth 0,025 mm. 

 PI. Ill, fig. 40, '7i a. S. V. b. F. V. 



Gallapagos Islands rare (Eugenie Exp.). 



Stauroneis Ehb. 



1. Stauroneis Balearica Cl. N. Sp. 



Elongated, with acute ends. Stauros very short. Striie transverse, 26 in 0,01 

 mm., and longitudinal 23 in 0,01 mm., crossing each other in right angles. 

 Length 0,11 mm. Breadth 0,013 mm. 



PI. Ill, fig. 41, a. ''V b- structure ^'""Vi- 

 Balearic Islets rare (F. Soderlund). 



This species is nearly akin to St. Qnarnerensis (Grun. in litt.) from the Adriatic 

 Sea, which has also a short stauros and 18 longitudinal stria? in 0,01 mm. 



2. Stauroneis sulcata Cl. N. Sp. 



Linear, with cuneate ends, stauros reaching the margin. Structure: strong, lon- 

 gitudinal lines or furrows, parallel with the median line, and transverse parallel stria?, 

 21 in 0,01 mm. 



