128 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



NITZSCHIA PULCHERRIMA Kitton 



(Micro. Journ., 1874, pi. 81, figs. 1-3; Peragallo, Diat., France, pi. 76, fig. 2.) 



This is another species common to both Campeche Bay and the 

 Philippine Islands. 



NITZSCHIA SPATHULATA Brebisson 



(Smith, Brit. Diat., pi. 31, fig. 268; Van Heurck, Synopsis, pi. 62, figs. 7-8; 

 H. L. Smith, Types, No. 370.) 



NITZSCHIA SUPEKBA Leuduger-Fortmorel 



(Leuduger-Fartmorel, Diat., Ceyl., p. 40, pi. 8, fig. 83.) 



For discussion of the probable identity of this and N. campecliiana 

 Grunow, see the latter. Typical specimens of N. superba were 

 found. 



NITZSCHIA TRYBLIONELLA Hanlzsch 



(Peragallo, Diat., France, pi. 69, figs. 11-13; Van Heurck, Synopsis, pi. 59, 

 fig. 6.) 



This minute variety of the type form is put as a separate species, 

 N. salinarum Grunow, in the above reference to Van Heurck's Syn- 

 opsis. It is better to retain Grunow's original idea of making it a 

 variety of N. tryblionella. (See Cleve and Grunow, Arct. Diat., p. 70.) 



NITZSCHIA TUBICOLA Grunow 



(Van Heurck, Synopsis, pi. 69, fig. 14.) 



Unquestionable examples of this rare diatom were found, which, 

 so far as I know, has been previously reported only from Sonderberg 

 (Denmark), occurring there "in the tubes of Navicula grevillei." 



NITZSCHIA VALIDA Cleve and Grunow 



(Cleve, W. I. Diat., pi. 3, fig. 19; Van Heurck, Synopsis, pi. 65, fig. 4.) 



This is another species common to both Campeche Bay and the 

 Philippine Islands. 



NITZSCHIA VERMICULATA Castracane 



(Castracane, Chall. Exp., p. 68, pi. 13, fig. 12.) 



It differs from N. superba Leuduger-Fortmorel (Diat., Ceyl., pi. 

 13, fig. 16) almost wholly in the peculiar vermiculate arrangement of 

 the beading. Perhaps only a Philippine Islands variety of that species, 

 Castracane 's type having been found at Zebu. 



NITZSCHIA WEISSFLOGII Grunow 



(Peragallo, Diat., France, pi. 76, figs. 3-4.) 



This species also is limited to Campeche Bay and the Philippine 

 Islands. 



