— 141 — 



According to Cleve (Description of plates) this form perhaps ought 

 to be referred to Nav. fallax Gl. or to Mastogloia. I must add that the 

 present form has no resemblance to the figure of Nav. fallax Cl. (Syn. I; 

 tab. V, fig. 24) and that I have seen no locnli in it. 



151. M. (Pseudoamphiprora) decora Grev. = Stauroneis decora Grev. 

 Tab. nostr. II, fig. 22. Gnfr. Grev. Tran. Mier. Soc. Edin. VIII, tab. III, fig. 11. 



L. 0,067 mm., b. 0,0126 mm. Striæ at least 25 in 0,01 mm., 

 conspicuous only at the margin outside the longitudinal lines. 



KKt (2 samples). 

 Area: New Caledonia. 



The present form is shorter and proportionally more slender than 

 Greville's. Cleve supposes that Stauron. decor. Grev. probably must 

 be referred to Pseudoamphiprora, a subgenus in its systematic position 

 between N. Lyratœ and Colonels (GL Syn. I, p. 70 & 72). 



Hennedyeœ. 



152. N. Heniiedyi W. Sm. var. furcata Perag. Perag. Diat. de Fr. 

 tab. XXIV, fig. 17. 



— — - var. nehulosa Greg. Perag. I.e. tab. XXV, fig. 11. 

 KKt (3 samples). 



Area: the main species ubiquitous. 



var. furcata: Banyuls, Naple (Perag). 



var. nehulosa: Cape Horn, Florida, Europe, Morocco, Madagascar, 

 Ceylon, Galapagos. 



Perstriatœ. 



153. N. brasiliensis Grun. A. S. Atl. tab. VI, figs. 23— 25. 

 KKt, LN, TK (6 samples). 



Area. Eastern Coast of America, Bab el Mandeb, Zanzibar, Madagascar, 

 the Seas S. and E. of Asia, New Caledonia, Samoa, Sandwich Islands. 



154. N. sublyrata Grun. Gi. Vega Exp. tab. XXXV, fig. 17. 

 Solitary in a sample from KKt. 



Area: North America, Labuan. 



Johnsonieœ. 



155. N. Scopulorum Bréb. Perag, Diat. de Fr. tab. VIII, fig. 29. 

 KKm, TK (2 samples). 



Area: Arctic Oceans, Brazil, Europe, Sumatra, Borneo, Japan. 



NB. Somewhat unsymmetrical as figured in the figure by Per a g all o 

 quoted above. In a few specimens I have seen a narrow stauros caused 

 by the wanting of striæ in the middle. 



