KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 27. N:0 3. 141 



This characteristic form is but imperfectly known, as no valves in a favourable position 

 have been examined. It seems impossible to find a place for this species in any of the above sub- 

 genera, the nature of the striation being entirely different, and closely similar to that of the 

 Lineolatce of Navicula, of which section it might be an asymmetrical form. 



9. A. Naumanni Jan. (1876). — Frustule sublinear, with slightly rostrate ends. L. 0,o5; 

 B. 0,012 mm., bordered with a narrow limbus. Zone on the dorsal side with two rows of puncta. 

 V. narrow; its dorsal side with about 10 strise in 0,oi mm. Ventral side smooth with a longitu- 

 dinal line. — A. S. Atl. XXXIX f. 19. 



Marine:? 



It is impossible to decide the position of this form, which I know only from the figs, in 

 Atl. representing entire frustules. It may be akin to A. pusilla Cl. or to A. Wittsteinii. 



Amphoree placed in the other genera. 

 A. Digitus A. S., Pinnularia ambigua Cl. 

 A. naviculacea Donk., Pinnularia Stauntonii G-run. 



Doubtful, or imperfectly known, Amphoree. 



A. acuta var. neogena Pant. (Ill PI. XII f. 187 1893); belongs to the subgenus Oxyamphora. 



A. amphioxys Bail. (Smiths. Contr. 1852 p. 39 PI. II f. 20 to 22) is according to Hamilton 

 Smith Hantzschia amphioxys, which appears to be beyond doubt. 



A. andesitica Pant. (Ill PL XIII f. 205; 1893). 



A. Argus Pant. (Ill PI. XXII f 329; 189,3) seems to be akin to A. ovalis. 



A. Beccarii. Db Notaris (Exb. Grit. ital. Ser. II N:o 633) unknown to the author. 



A. budayana Pant. (Ill PI. XXIII f. 336). 



A. bullosa. FiOR. Mazz. (Atti. Soc. crit. ital. 1879 p. 104. Colletonema bullosum Fior. Mazz. 

 Atti. Acad. Pont. N. Lincei 1861 PI. I fig. 1 — 5) unknown to the author, not having seen the 

 original paper. 



A. cingulata Pant. (II PI. XXV f. 369; 1889) is an indeterminable fragment of some diatom. 



A. coarctata Lbud. Fortm. (D. de Ceylon PI. II f. 18; 1879) impossible to identify. 



A. cristata Petit (D. de Campbell p. 18 PL IV f. 8; 1877) is unknown to me, but seems 

 to be a remarkable species, which however is too imperfectly figured and described to decide as 

 to its place in the system. 



A. eunoticeformis Grun. (A. S. Atl. XXXIX f. 5) seems to be a Navicula akin to Nav. 

 rhombica. 



A. invidenda Pant. (Ill PL XIV f. 210; 1893). 



A. Kossuthii Pant. (Ill PL X f. 169; 1893). 



A. lutea Leud. Fortm. (D. de Ceylon PL If. 10; 1879) an indeterminable connecting zone 

 of some diatom. 



A. munda A. S. (Atl. XL f. 15; 1876) no Amphora, but a frustule of a Tropidoneis, akin 

 to T. Lepidoptera. 



A. naviformis Lbud. Fortm. (D. de Malaisie PL I f. 6; 1892) probably Hantzschia marina. 



A. obtecta Bail. (H. L. Smith Lens p. 77 PL II f. 12) cannot be identified. Possibly a form 

 of A. Grevilleana. 



A. obtusiuscula Grun. (A. S. Atl. XXV f. 7; 1875) seems to be a Navicula of the section 

 Fusiformes. 



A. rectangularis Greg. (T. M. S. 1857 p. 70 PL I f. 29) represents in Hamilton Smiths opi- 

 nion, in which I agree, some Stauroneis. 



A. rimosa Ehb. (Am. p. 79; 1843; M. G-. V: i f. 27). 



A. Schmidtii Petit (Campbell D. p. 17 A. S. Atl. XXVII f. 51). 



