Translation 2816

50
1. Cells are ovoid to almost spherical, 45-55/Li in length,
with three sturdy spines connected by a crest on the antapical
Plates P baliense 1.
2. Cells are ovoid or pyriform, 35-50U in length, with
a few isolated, sturdyspineson the antapical plates, the spines are occasionally
absent P. aciculiferum 2.
3. Cells are ovoid or oval, 25-40M in length, plates are
. convex, minutely punctate; numerous papillae or very short spines
occur on the antapical plates. The epivalve is larger
than the hypovalve P Lomnickii 3.
• 4. Cells are ovoid, measuring 30 x 25-30i4,. Plates are
partly concave, and, on the epivalve, minutely areolated. The hypovalve
is densely occupied by minute spines The epivalve and the
hypovalve are of equal size or the hypovalve is occasionally larger.
P. Godlewskii 4.
5. Cells are spherica1,30-35M1n diameter; plates are
convex, minutely punctate or covered with small papillae.
P. jprzeiskii 5•
6. Cells are nearly spherical, 45-67m in length, plates
concave, without spines on the hypovalve. . . P. .41y9.21m . 6,
1. Cells are oval and elongated, 25-35-40,4 in length; (220)
apical plates are usually convex, antapical plates plane or concave;
longitudinal groove widens distinctly on the hypovalve.
P. umbonatum 1.