390 REMARKS ON THE OAMARU DIATOM PArERS. 



rarely with traces of costas, which Herr Grunow calls I. inter- 

 media. There is yet a third form with delicate markings 

 and a long, obliquely truncated process, suggestive of Hemiaulus 

 tenuicornis, Grev. For this, which is not rare, Herr Grunow pro- 

 poses the provisional title Isthmia ? tenuicomis, unless perhaps 

 it should be placed in a special genus. 



Hemiaulus ? tenuicomis, Grev. Differs in marking from the 

 Barbadoes type, and, if not a separate species, should, at least, 

 be designated var. Novce Zealandice. 



Glyphodiscus scintillans, A. Schm. Herr Grunow has noticed 

 several examples, up to 01 mm., with as many as 15 marginal 

 spots. They differed from Schmidt's figure by having small 

 punctse (spines ?) , one between each two marginal spots. The 

 structure of the valve was also different, being covered, in 

 addition to the short, irregular, radial markings, with a net- 

 work of irregular meshes. He calls this form Eupodiscus 

 Oamaruensis, not having met with the true Gl. scintillans of the 

 Nicobar earth in the Oamaru deposit. 



[Eupodiscus Oamaruensis, Grun., has been placed by Mr. 

 Rattray in a new genus, Debya (" Jour. Roy. Micros. Soc," 

 Dec, 1888, p. 909), but that name having been previously 

 adopted by Dr. Pantocsek for a different generic form, Mr. 

 Rattray has since given the MS. title of Aporidiscus to the 

 genus. In the meantime Dr. Toni has published the designa- 

 tion " Rattrayella " for the same, which appears in " Notarisia," 

 January, 1889, p. 691.— E. G.] 



Eupodiscus Debyii, Gr. and St., in Uteris (Lampriscus Debyii, 

 Gr. and St.), is certainly not a Lampriscus, and can hardly be 

 classed with Eupodiscus, but should, perhaps, be placed in a new 

 genus. 



[This form is now Isodiscus Debyii, Rattray (" Jour. Roy. 

 Micros. Soc," Dec, 1888, p. 920).— E. G.'] 



Cosmic-discus Normanianus, Grev. Differs greatly from Gre- 

 ville's figure, and is probably a new species. 



Brightwellia pulchra, Grun. Herr Grunow is now doubtful 

 whether this form can be separated from B. coronata, Grev. 



Stephanogonia Nova Zealandica, Grun. (St. Dauica, Gr. and 

 St., nee Grun.). Differs greatly from St. Danica, by the 

 absence of punctation. 



Biddulphia pedalis, Gr. and St. In the proposed separation 



