(WO 

 I 



Mr. C. Mcrcschkowsky on Californian Diatomn. 519 



KXl'LVNATIOX OF TlIK TLATRS. 

 ri.AiK IV. 

 Filf. 1. Nitzschiellti temiirtxtris, >rer. (typica). Sun Pedro. 

 Fiy. "2. Ditto. <j, valve ; 6, jjirdle-fiice. Sun Pedro, -j . 

 Fig. 3. Ditto. San Pedro, -j- 



Fiffs.4,'5. N. tetnn'rostn's, \\\rmu direcfti. San Pedro, -r . 



Fig. 0. iV. tenuirostris, var. hatu'difera, Mer. Mediterranoan (\ illo- 



fraiiche). -^. 

 Fig. 7. Ditto. Diagram showing the b^'uuI torsion of the onda. 

 Fig. 8. N. tenuirostris, var. parva, Mer. Valve. Black Sea (Tlieo- 



dosia, Crimea). — . 

 Fig. 9. Ditto. Girdle-face of the .oame iudividuul. 

 Fig. 10. Ditto. San Pedro. ^^ 



600 



1-^. 11. N. tenuirostrin, forma vtinutiKsima. San Pedro, -p. 



Fig. 12. Nitzschiella gracilis, Mer. (typica). Valve. San Pedro. -^ . 



jFt^. 1.3. Ditto. Girdle-face of the same individual. 



Fig. 14. N. gracilis, var. reversa, Mer. San Pedro. -^. 



Figs. 15-17. Nitzsc/iiella bip/acata, var. pacijica, Mer. Figs, lo & 17, 



valves ; fig. IG, girdle-face. San Pedro. -,-. 

 Figs. 18-20. Nitzsc/iiella callfornicu, Mer. Fig. 18, valve ; figs. 19 & 20, 



girdle-faces. Redondo, California. -^ . 



Fig. '2\. Ci/liiidrotheca gracilis (liri^h.), GruD. San Pedro, -r-. 



Figs. 22, 23. Mastogloia {Orthoneis) IVrightii, O'Meara. Northern Cali- 



, . 900 



forma, -j- . 



Fig. 24. Optical section through a frustule of Xavicula forciiiuta, 

 ^900 * ' 



Grev. —. 



Fig. 25, Navicula (lihoiconeis) genujlexa, Kiitz., with cell-contents. San 

 Pedro. 



Fig. 26. Diploneis papula, A. S., with cell-contents. San Pedro. 



Fig. 27. Biddulphia [Triceratium) sa7ipedroa)ia, Mer. San Pedro. -, . 



Figs. 28-30. Biddulphia simplex, Mer. San Pedro. Figs. 28 & 29 -". 



Plate V. 



Figs. 1-3. Licmophora lata, Mer. San Pedro. —. 



Figs. 4, 5. Licmophora pacijica, Mer. In fig. 4 the striio are not repr»- 



Kentt'd. San Pedro. —• 

 Fig. G. Licmophora inonteregaua, Mer. Monterey, y • 

 Fig. 7. Licmophora Thumii, Mer. Monterey. -, . 

 i-V//.«. S, 0. Licmophora Moyiksii, Mer. San Pedro. — . 



