72 E. GROVE AND G. STURT ON 



Dicladiacapreolus, Ehr. (Brightvv., " Q. J. M. S.," p. 107, PL 7, 

 Figs. 53 to 60). — This occurs not rarely, along with forms 

 resembling Syndendrium diadema, Ehr., which may be the 

 Sporangia ? of Chcetoceras. 



Small discs are also present abundantly, oval or oblong, with 

 rounded ends, and with a submarginal ring of closely-set 

 puncta. Frustular views of these show two narrow, somewhat 

 umbonate valves, one of which has an inflated centre, bearing a 

 short spine. These may be allied to Thalassiosira Cleve, but 

 we are unable to come to any conclusion. 



Since the publication of Parts 1 and 2 many more species 

 have been discovered, and further examination has led us to 

 alter our views as to one or two species hitherto included in 

 Biddulphia. Of these we now give particulars, excluding such 

 new forms as we are unable to figure in the plates accompanying 

 this part, but which will be given subsequently in an appendix. 



Cymbellej;. 



Amphora furcata, Leud. Fort. (" Diat. de Ceyl.," p. 20, PL 1, 

 Fig. 11) = A. spectabilis, Greg. (" G. D. C," p. 44, PL 5, Fig. 80). 

 — Rare. 



Cocconeide^:. 



Gocconeis costata, Greg. (" Q. J. M. S.," Vol. iii, p. 39, PL 4, 

 Fig. 10).— Rare. 



G. naviculoides, Grev. (" T. M. S.," Vol. xiii, p. 34, PI. 4, Fig. 

 24). — Scarce. 



Mastogloie^. 



Orthoneis splendida (Greg.), Grun. {Gocconeis, " G. D, C.," p. 

 21, PL 1, Fig. 29).— Attains a length of -0055", but has 

 finer striae than the type form, about 22 at centre, and 18 in 

 •001" at margin. Not very scarce. 



NAVICULACEiE. 



Navicula braziliensis, Grun. (A. Sch., "AtL," PL 6, Figs. 

 23-25). — A few fairly typical examples have occurred. Length 

 •0045". Striae about 28 in '001". Also a small form with closer 

 striation (40 in "001") . A form of this species is present 

 which has sublyrate clear spaces, resembling N, Bailey 'ana, 

 Grun. (I.e., Figs. 26, 27). 



