ill!Ill

MUELLERIKI.I.A.
Ascidians, off Hull. They are all fossil or marine, and inhabit especially the
torrid and arctic regions. We give here the
Fig. T59. a. Trochosira mirabilis
h. c. Trochosira spinosa.
c.
435
frustule (fig. 158^), and the valve (fig. 158,7),
of Stcphanopyxis corona (E/ir.), Gntn.
(Systephania E/ir.),
which is found in the
Nottingham deposit. Trochosira mirabilis
Kitt., (fig. 159^7), and Trochosira Spinosa
Kitt. (fig. 159/;, c), are both found in the " moler " of Mors (Jutland).
GENUS 104. MUELLERIELLA, H.V.H., 1894.
Fig. 160. Muelleriella limbata.
by keeping me au courant with his works.
Valves elliptic, with non-cellu-
lar structure, the median portion
apparently smooth, with short
scattered spines, margins robust,
divided into numerous rectangular
compartments, formed by the presence
of perpendicular costae at the
margin.
We have pleasure in dedicating this
new genus to our friend the Baron and
Dr. Ferd von Mueller, the learned
explorer of Australia, who for more
than twenty years has honoured me
M. limbata (Ehr.) H.V.H. {Pyxidicula limbata Ehr., H.V.H.
Arl, pi. 8 3 ter, f. 13-14*).
Valve elliptic, much inflated, convex ; central portion apparently smooth,
but really covered with very fine puncta scattered here and there ; other
portions irregularly in quincunx ;
numerous robust short spines, bifid or trifid,
alate, and anastomosing at the bases. Margins very robust, punctate like
the median portion, divided into rectangular compartments, in consequence
of the presence of internal costae perpendicular to the margins of the valve.
Major diameter of the ellipse, 8 to 10 c.d.m. ; minor diameter, about 4 c.d.m.
Fossil. Sta. Monica (Prep. Weissflog, Nos. 010 and on), Richmond.
var. Cristagalli Brun. and Temp. (Diat. Japan, p. 40, pi. 8, f. 8).
Girdle face broad and like a hood, having the form of a cock's comb.
Limestone from Sendai and Yedo (Brun).