30 



NOVARA DIATOMS. 



Descriptions of New Genera and Species of Diatoms obtained by the 

 Austrian Imperial Frigate Novara, during her Voyage round the 

 World. 



By Herr A. Grunow. 



(Translated by F. Kitton.) 



Part I. (with Plate ii.) 



We have much pleasure in introducing to our readers an English 

 translation, andfac similes of the new forms obtained during the 

 above expedition. As copies of the original paper are difficult to 

 obtain, we have no doubt that this and the succeeding paper will be 

 welcomed by those who are studying the Diatomacese. 



Gomphonitzschia Ungexiana, Grim. — Frustules small, linear 

 cuneate, valve linear lanceolate cuneate, apex rounded. 



Puncta 33 in. "001, striae transverse, delicate, about 60 in. '001. 



Sometimes sessile on a mucous cushion, at others attached to a 

 short stipes. 



[PI. ii, f. 1, valve a, b side view of frustule, c front view do., d 

 stipitate variety, e sessile do.] 



Upon Cladophora macrogonia, Upper Egypt, Unger. 



A well marked species, nearly approaching the Nitzschias, but 

 also bearing a resemblance to Gomphonema, Meridion, Lichmophora, 

 Roikosphenia, &c. 



Synedra investiens, W. Smith, Synopsis Brit. Diat. — [PI. ii, f. 2, a 

 valve, b d c front view of a double frustule.] 



In a mass upon Ectocarpus littoralis, from the shores of the 

 Island of St. Paul, in the South Sea. 



Its appearance on Ectocarpus, as well as the strong stride leaves 

 no doubt about the determination of this unfigured species of 

 Smith. I have given two side views, and a front view of a double 

 frustule. 



(The fact of its growth on an Ectocarpus is of no specific im- 

 portance ; I have found it investing Polysiphonia pulvinata ? and 

 also parasitic on the stipes of a Rhipidophora, F. K.) 



Diatoma ? exiguum, Grim., n. s. — Frustules minute, linear, 

 valves linear with rounded apices ; costa3 strong 18-20 in. -001. 

 [PI. ii, f. 3, a b c d front view, e side view.] 



Upon Lessonia, from the coast of Chili. 



It may possibly be a small Denticula ; it also resembles a 

 Diatoma or Odontidium, between which the generic differences are 

 very uncertain. (I should be inclined to refer it to Diatoma 

 elongatum, var. *y, Sm. Brit. Diat. = D. tenue, Kutz. Bacill. PI. 

 xvii., 9, 10. F. K.) 



Eeikeleya Harveyana, Grunow.— [PI. ii, f. 4.] He says it is dis- 

 tinguished from other species of Berkeley a by the club-shaped form 

 of the mucous envelope (Schleimmassen). The frustules are small 



