A. CLEVE- EULER, DIÄT. FLORA OF FINLAND. 35 



Amphora (Proteus var.?) impressa n. sp. — PI. 2, f. 43. 



Frustulo elliptical, öl ;x in length, 25 u. in breadth. Valve 

 impressed at the central nodule. Striae 12 in 10 a, not 

 distinctly punctate. Ventral side striate as in Amphora Proteus. 



Foss.: Ab. Hindersmossen {Litorina-deip.), rare. 



Amphora robusta Greg. var. brevistriata n. var. — PI. 

 2, f. 4i. 



Differs from the typical form of Gregory by the closer 

 striation — 9 coarse puncta in 10 a — and the short ventral 

 striae, forming a narrow band along the median line. 



Foss.: Sat. Panelia (Li7orma-dep.). 



Distr. of the main form (mar.) : Spitsbergen, North Sea, 

 Adriatic, Pacific Ocean. 



Amphora perpusilla Grun. — V. H. Syn. Tab. 1, f. 11. 



Foss.: Ab. Hindersmossen. 



Distr. (fresh iv.): Sweden, Continent of Europe. 



Amphora mexicana A. S. var. major (Cl.). — PI. 2, f. 

 45 a, b. Syn. Amphora arenicola Grun. var. major Cl. Syn. 

 Nav. D. II, p. 104. Amphora robusta f. A. S. Atl. 27, f. 39, 

 41. Amphora Lima Pant. Ill, Tab. 23, f. 347. 



Valve 100 — 130 a, rarely until 150 [j- in length, with 7,5 

 — 8 rows of coarse, transapically elongated puncta or alveoli 

 in 10 a. In dorsal view, a very marked longitudinal line is 

 seen near the median line (fig. 55 a). 



Foss,: Ab. Hindersmossen [Litorma-dep.). 



Distr. (brack, ic): Baltic, Sweden (fossil in deposits from 

 the Litorina-e-poch) . 



This robust and very conspicuous form has in dorsal 

 view a striking resemblance with Amphora mexicana A. S. 

 (Atl. Tab. 27, f. 47) in everything, except concerning the 

 place of the longitudinal line, as Schmidt's figure shows that 

 line nearer to the dorsal margin than to the median line. 

 Schmidt writes about the fig. 39 and 41, quoted above and 

 drawn from Swedish specimens (from Södertelje) that they 

 are »nach meiner festen Überzeugung von Amphora mexicana 

 specif isch verschieden» and »scheinen mit Amphora robusta 

 zusammenzuhängen». Nevertheless, I think they come nearest 

 to Amphora mexicana for the sake of the strong longitudinal 



