20 P. T. CLEVE, ON SOME NEW DIATOMS. 
Actinella Lewis. 
1. Aetinella Guianensis Grun. in litt. 
Of the genus Actinella only one species, the A. punctata Lewis from White 
Mountain Deposits, is known. The genus, which is nearly related to Eunotia, is distin- 
guished by the different development of the ends. The puncta, which follow the mar- 
gins of A. punctata as well as of A. Guianensis, are also visible in true Eunotia, for 
instance E. denticulata Bres. 
The Actinella Guianensis, which occurs rarely in Cu. et Mézx. Diat. N:o 212, is 
larger than A. punctata and has 14—16 strie in 0,01 mm., varying in different parts 
of the valve. : 
Length of frustule 0,105 mm. Breadth of one end 0,007 of the other 0,011 mm. 
Pl Vy De OS 
Brazil, Caldas on mosses (Dr. Hs. Mosty). 
Asterolampra Exs. 
1. Asterolampra Balearica Ct. N. Sp. 
Rays about 10, not reaching the margin of the disc. Umbilicus small, the dia- 
meter being only */,—*/, of that of the disc. Umbilical rays are straight and not 
branched. The compartments are covered by cellules arranged into lines, crossing each 
other in three directions, 9 in 0,01 mm. 
Diameter of the valve 9,0715 mm. 
Balearic Islets extremely rare (F. SOpERLUND). 
Pl. V, fig. 59, a. *”/,, 6. a compartment *°°°/,. 
This species appears to be related to Asterolampra Grevillei Watuicu, which also 
occurs in the Balearic gathering, but this species has much finer cellulation (20—22 
lines in 0,01 mm.). The A. centraster Jounst. Micr. Journ. VIII, p. 12, Pl. I, fig. 10 
is more nearly related, but its umbilicus is larger. 
Coscinodisecus Exs. 
1. Coscinodiscus undulatus Cu. N. Sp. 
The surface of the disc elevated in the middle and with an elevated ring half- 
way between the centre and the margin. Surface covered with dense, pearllike puncta 
arranged in lines radiating from the centre to the margin, where they become smaller, 
much more crowded and form short striz. 
Diam. 0,096 mm. 
Pl. V, fig. 60, a. *°°/,, 6. °°°/, outline of a valve in oblique position. 
