78 NOVARA DIATOMS. 



Larger than JV. panduriformis, but of similar shape ; the struc- 

 ture, however, differs, whilst the irregular, closely packed puncta 

 show no symptoms of oblique arrangement, but very delicate trans- 

 verse lines, whilst the longitudinal lines are not resolvable. This 

 form would, perhaps, better be considered a variety of N. plana, 

 Sin., to which it bears resemblance. I have only had the oppoitu- 

 nity of examining two valves. To this genus, perhaps, belongs 

 also the N '. panduriformis of Hantzsch in "Rabenhorst-Beitragen," 

 Part I. PI. vi. fig. 7. There also no oblique striae can be detected. 

 iV. bilobata, Sni., has a similar outline to this form, on account of 

 its central keel, and although not observed by Smith, its central 

 nodule, like Amphiprora latestriata, Breb., should be placed with 

 the Amphiprora or some Amphiprora-like genus which possess 

 punctate keels. 



(The author was no doubt misled, like De Brebisson, by Smith's 

 erroneous figure, which represents N. bilobata with distinct striae. 

 The Amphiprora latestriata of De Brebisson, from whom I received 

 authentic specimens, is Navicula convexa, Sm. ! ! The present 

 species can hardly be a variety of N. panduriformis, Greg., the 

 arrangement of the striae in that being totally different, viz., in 

 regular lines and their oblique direction being very distinct. — F. K.) 



Euphyllodium spatulatum, Shadbolt.— Many characteristic forms 

 occur in the Polycystin stone from Nankoori, showing distinctly 

 the costae between the quadratic puncta. On the narrow base the 

 costae are bifid, nevertheless I believe the species now before me, 

 although not absolutely identical with Shadbolt's form, must be 

 placed with Podocystis. PL i. fig. 10 is a valve from Naukoori 

 enlarged to 500 diameter. 



(It is to be regretted that the author did not figure a normal 

 instead of an abnormal form. My specimens have both margins 

 alike, as in other species of Podocystis. — F. K.) 



Orthoneis ? Barbadensis, Grim. — Cocconeis, Greville in Mic. 

 Jour. xii. PI. ii. f. 10. 



Var. nankoorensis, Grim. Small, elliptical. PI. v. fig. 13. 



In Polycystin stone, Nankoori, very rare. The valves are much 

 smaller and narrower than in the type form, and the puncta nearest 

 the median line form curved lines, which in Greville's figure are 

 straight. The structure, however, closely enough resembles the 

 type species. 



Uflastogloia Jelinekiana, Gran. — Navicula Jelinekiana, PI. v. 

 fig. 12. 



I have recently found this form in tolerable plenty among diato- 

 maceae collected by Lindig at Honduras, and find in many examples 

 the marginal oblong plates (platten) which appear to be the ana- 

 loo'ues of the marginal plates of Orthoneis fimbriata. But on account 

 of the lanceolate form of the valves and generally produced apices 

 I cannot well place this form in the genus Orthoneis. 



In the meanwhile I place it in Mastogloia, which must therefore 



