180 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



Plate 24 



Page 



Fig. 1. Navicula obesa (Greville) Mann, variety. X600 111 



(See also pi. 23, fig. 6.) 



2. Navicula ocellata, new species. X830 112 



3. Navicula partita, new species. X770 113 



4. Navicula patricia, new species. X560 114 



5. Navicula delecta, new species. X510 100 



6. Navicula delecta, new species. X430 100 



7. Navicula delecta, new species. X590 100 



8. Navicula plicatula Grunow, typical form. X810 115 



9. Navicula plicatula Grunow, variety. X810 115 



Plate 25 



Page 



Fig. 1. Navicula philippinarum, new species. X660 114 



2. Navicula pseudo-clavaia, new species. X590 116 



3. Navicula pulvulenta, new species. X700 117 



4. Navicula madagascarensis Cleve, variety. X750 108 



5. Navicula retrostauros, new species, X680 118 



(See also pi. 26, figs 1-2.) 



Plate 26 



Page 



Fig. 1. Navicula retrostauros, new species. X600 118 



2. Navicula retrostauros, type. X610 118 



(See also pi. 25, fig. 5.) 



3. Navicula pudens, new species. X700 117 



4. Navicula pugio, new species. X840 117 



5. Navicula semistauros, new species. X590 119 



6. Navicula serrutula Grunow, variety. X570 120 



7. Navicula simulator, new species. X590 120 



8. Navicula spiculij 'era, new species. X840 121 



9. Navicula translucens, new species. X440 123 



Plate 27 



Page 



Fig. 1. Navicula spectabilis Gregory. X310 121 



2. Navicula spectabilis Gregory, wide variety? X450 121 



3. Navicula suffocata, new species. X770 122 



4. Navicula venusta Janisch type form. X820 124 



5. Navicula venusta, variety. X820 124 



6. Navicula vesparella, new name. X820 124 



7. Navicula weissflogii A. Schmidt. X570 125 



Plate 28 



Page 



Fig. 1. Nitzschia biscidpta, new species. X590 125 



2. Nitzschia bisculpta, new species. X590 125 



3. Nitzschia campechiana Grunow. X570 126 



4. Nitzschia campechiana Grunow. X560 126 



5. Nitzschia cocconeiformis Grunow. X570 126 



6. Nitzschia insignis Gregory, variety. X550 127 



7. Nitzschia zebuana, new species. X650 129 



