Translation 2816
Translation 2816
Translation 2816
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53<br />
1. Cells are ovoid to pyriform, 24-40f-{ in length with<br />
(240) .<br />
only six pre-equatorial plates, and no median apical plates; with<br />
several spines`on the antapicàl plates .... . P. Cunnin:-tonii 1.<br />
2. Cells are distinctly elongated, thinner, 30--40/q in<br />
length with 7 pre-equatorial plates,.2 median apical plates, and<br />
1 dorsal apical plate . . . . . . . . . . .. . . P. quadridens 2.<br />
A. The dorsal apical.plate touches the apex and becomes plate 3'-<br />
(244) .<br />
1. Cells are ovoid, measuring 30 x 28Jq. Plates are smooth or<br />
lightly punctate. The panelling pattern of the epivalve is<br />
symmetrical , ^ . . . . . . . . . . . . . P.Penardii 1.<br />
2. Cells are ellipsoidal or rhomboid, measuring 26-30 x 26-33;<br />
the panelling pattern is asymmetrical .. P. berolinense 2,<br />
B. The dorsal apical plate is remote fromthe apex:<br />
3. Cells are ovoid or pyriform, often almost spherical, measuring<br />
41--54 x 35-41^{ . Plates are frequently concave, faintly<br />
areolated. vorsal apical plate is sexangular or pentangular.<br />
P.Borgei3.<br />
4. Cells are pentangular, 30-40A in length. Plates are plane<br />
or slightly convex (rarely, one plate or another is concave).<br />
Dorsal apical plate is pentangular. . . . P. penardifor.me 4.<br />
5. Cells are ovoid, measuring 35 x 30R Plates are convex. Dorsal<br />
apical plate is quadrangular. .... .. P. Kulczinskii 5.<br />
While the panelling pattern is symmetrical in the species<br />
P. Pene.rdii., tienardiî orme, Kulczinskii and BorLe:i 3 it is asymmetrial<br />
in P. berolinense.