14 



American Quarterly Microscopical Journal. 



conscientious accuracy and faithfulness. Grunow has des- 

 cribed a Navicula Kutziiigii, but it proves to be N. Proscrpinae 

 LDiploneis) E. thus leaving the name free. It is No. 287 of the 

 "Species Typicae Diatomacearum." 



Navicula parvula, n. sp. H. L. S. Villerville, France. M. de 

 Brebisson. Frustules small, valves lanceolate, with acute apices. 

 Striee divergent and readily seen. Frustules linear in f. v. with 

 rounded ends. Length .0005 ; breadth .00015. Striae 42 in 

 .001. Plate III, fig. 4- 



I have not been able satisfactorily to identify this form as 

 belonging to any species hitherto described. It is extremely 

 abundant in the gathering which I received from M. de 

 Brebisson, labeled by him simply as ^'Navicula," indicating that 

 he was not decided as to the species. 



Nitszchia Kittoni, n. sp. H. L. S. Hab. River Catuche, Caracas, 

 Venezuela. Mr. F. Kitton. Frustules linear, valves lanceolate 

 with sharp and slightly constricted apices, marginal punctae 

 very distinct, 16 in .001, and quite prominent in f. v., striae 

 faint. Length .0007 to .001; breadth .0002. Plate III, fig 5. 



Mr. Kitton, when he sent this diatom to me, referred it very 

 doubtfully to W. Smith's Nitzschia minutissima, to the figure 

 of which it has a remote resemblance, the apices, however, are 

 less constricted, and Smith himself quotes Synedra dissipata of 

 Kutzing as a synonym, from specimens sent to him by De 

 Brebisson, and as I have from De Brebisson, specimens labeled 

 "iV/Vs. minutissima W. S.^- Synedra dissipata," which are quite dis- 

 tinct from the present form, and with the marginal punctae 

 much finer, 39 in .001, and not so prominent in s. v., I have not 

 hesitated to name it after the eminent diatomist from whom I 

 received it. It was collected from a water tank supplied by 

 the river Catuche. 



Raphoneis australis, n. sp. H. L. S. Hab. Royal Sound, 

 Kergueland's Land. Dr. J. H. Kidder. Frustules somewhat 

 variable in size, valves cuneate, rounded at the larger end, and 

 coarsely monliform striate, striae interrupted by a smooth 

 blank space, frustules slightly cuneate in f. v. Length .0005 to 

 .00086; breadth .00022 to .0004. Striae about 30 in .001. Plate 

 III, fig. 6. 



This form constituted the bulk of a washing from black sand 

 dredged by Dr. J, H. Kidder, Surgeon U. S. N., in from five to 

 twelve fathoms water in Royal Sound, Kergueland's Land, 



