Harbor of Charleston, South Carolina. 



105 



Epithemia Ilyndmanii, W. S. 



" musculns, K. 



Navicula didj'ma, K. 



* " maculata, B. 



* " per magna, B. 

 Nitzschia scalaris, W. S, 

 Pleurosigma angulata, W. S. 

 Triceratium alternans, B. 



" favup, Elir. 



" punctatiun, T. B. 



Tryblionella scutclliim, W. S. 

 " punctata, W. S. 



Actinocyclus undulatus, Elir. 

 Actinophoenia splendent, Shad. 

 Auliscus caelattis, B. 

 " pruinosus, B. 

 " punctatus, B. 

 Biddulphia rhombus, W, S. 



" aurita, Breb. 



Campylodiscus cribrosus, W. S. 

 Cocconeis scutellum, Ehr. 

 Coscinodiscus actinoptychus, Ed. 



" excentricus, Ehr. 



" linentus, Ehr. 



" ocuUis-iridis, Ehr. 



" radiatus, Ehr. 



" subtilis, Ehr. 



The JVavicicla signia, Ehr., of Bailey's list is most probably 

 synonyinons with the Pleurosigma angulata^ W. S., of mine. 

 The species marked with an asterisk (*), now placed in the 

 genus ]^avicula, are characterized as follows : — 



NaviGiila maoulata = Stauroneis maculata^ B. 1850. — " Lan- 

 ceolate or elliptical, ends slightly produced and rounded ; sur- 

 face punctato-striate, with a large, smooth central space." — 

 JBailey. To this description I have to add the following mea- 

 surements. Length, -0055 in. Breadth, -00216 in. Stride 

 coarsely moniliform, 12 in '001 in. 



Namcula jpermagna = Pinnularia jpermagna, B., 1850. — 

 " Large, lanceolate on the ventral faces, with punctato-striate 

 marginal bands, and a broad, smooth central stripe; ends slightly 

 rounded." — Bailey. I have as yet only found this species in 

 small quantities, and have been unable to take its measurements. 

 There can be no doubt that these two species should be placed 

 in the genus Kavicula, as the seeming stauros in the first, the 

 presence of which would seem to rank it in that of Stauroneis, 

 is only a blank space, such as is seen in many species of JSTavi- 

 cuhi, as N. elegans^ etc. The presence of moniliform strias in the 



