atløses af en fin, ophoiet Linie. Denne Fure ligesom dæk- 
kes af dens venstre fremragende, temmelig skarpe Rand, 
der taber sig i den ovenomtalte fine, ophøiede Linie. 
Cellerne ere stillede paa hver Side af Midtfuren i 
langt fra hinanden staaende Rekker, Fig. 9. 11. Disse 
have en meget skraat opadgaaende Retning fra Dorsal- til 
Ventralfladen. I hver Række er der 3 Celler, som have 
en Traktform og ere fra 3—5”” lange, saaledes nemlig at 
den egentlige Dorsalcelle er mindst, og den, der staar nær- 
mest Ventralfladen, er størst, Fig. 10. Cellerne ere glatte, 
glindsende, deres indre Væg er fastvoxet til Rachis og er 
noget længere end den ydre, Fig. 10, a, hvoraf følger, at 
Aabningen er skjæv saaledes, at den ydre, fri Rand, der i 
Regelen er forsynet med 3 stærke Teender, staar lavere end 
den indre, fastvoxede Rand, Fig. 10, 0. 
Celieaabningen er 1,5”” vid, og paa enkelte Celler er 
der paa den fri Rand 5—6 meget smaa Papiller, der giver 
Randen et undulerende Udseende. Paa den nederste Del 
af Rachis ére Cellerne mindre, staa længere fra hinanden 
og tildels kun 2 1 hver Række, imedens paa den øverste 
Del af Rachis staa Cellerne noget tættere, og her sees 
enkelte mindre Geller, som staa til Siden af Rækken uden 
egentlig at tilhøre denne, Fig. 8. 
Imellem hver Cellerække er en Gruppe Zooider, der 
strække sig fra Dorsalfladens Midtfure paa hver Side til 
henimod Ventralfladen, hvor de ordne sig i Rækker (2—3 
i hver), Fig. 8. 10, c, imedens de langs Midtfuren danne 
en uregelmæssig Længderække, Fig. 9. Lignende Zooider 
findes ogsaa dels imellem Cellerne, hvor de staa enkeltvis, 
dels paa selve Cellen, Fig. 10, e. 
Nedenfor de udviklede Celler sees mange, næsten paa- 
tversgaaende Rækker med uudviklede Celler, 2—3 i hver 
Række, og imellem hvilke findes enkeltstaaende Zooider. 
Ventralfladen er lidt hvælvet og har langs Midten en 
eylindrisk, stærkt fremspringende, vandklar, nøgen Kjøl, 
der ser ud, som om det var en fin Glasstav, der var place- 
ret langs denne Flades Midtlinie, Fig. 10, f. Paa hver 
Side af Kjølen iagttages to Længderækker Zooider, Fig. 
10, g, der ere noget mere eleyerede end de paa Dorsal- 
fladen. 
Cellerne ere rigt besatte med større og mindre stav- 
formige, trekantede Spikler, der ere 'vandklare, — kun 
yderst faa have et rødligt Skjær, som imidlertid er saa 
svagt, at det kun med stor Opmærksomhed kan iagttages. 
Spiklerne ere fra 0,222”"— 1,023” lange og fra0,041—0,055”™ 
brede og ere ordnede saaledes, at i Midtpartiet af Cellen 
ligge de næsten 1 en ret Linie, men til Siderne straale de 
vifteformigt ud fra Midtlinien, hvorved de i den nederste 
‘nde af Cellen samle sig 1 en afstumpet Konus, imedens 
I Re- 
de foroven pyramideformigt gaa over i Tænderne. 
furrow gradually disappears, and is replaced by.a slender 
elevated line. This furrow is covered, as it were, by its 
protuberant, rather sharp left margin, which becomes 
absorbed in the slender elevated line, spoken of above. 
The cells are situated on each side of the mesial 
furrow, in series, placed at considerable intervals apart 
(figs. 9, 11). These have a very diagonal, upward direction, 
from the dorsal to the ventral surface. In each series, 
there are 3 cells, having a funnel-shape, and measuring 
from 3—5”” in length; they are so placed that, the 
real dorsal cell is.the smallest one, and the cell which is 
placed nearest to the ventral suriace is the largest one 
(fig. 10). The cells are smooth, and shining; the inner 
wall is concreted with the rachis, and is somewhat 
longer than the outer wall (fig. 10, a), and consequently, 
the aperture becomes crooked, in such manner, that the 
exterior free margin; which is usually furnished with 3 
strong teeth; is situated lower than the mner concreted 
margin (fig. 10, b). 
The cellular aperture is 1.5”” wide; and, in a few 
cells, there are found 5—6 very small papille situated 
on the free margin, which impart to it an undulatory 
appearance. On the inferior part of the rachis, the cells 
are smaller, and are placed further apart from. each other; 
and, occasionally, there are only 2 in each series; whilst, 
upon the superior part of the rachis, the cells are placed 
somewhat closer; in this situation, a few smaller cells 
are seen placed at the side of the series, without, actually, 
belonging to it (fig. 8). 
Between each cellular series, there is a group of 
zooids, extending on each side, from the mesial furrow on 
the dorsal surface to the proximity of the ventral surface, 
where, they arrange themselves in series (2—3 in each) 
(fig. 8, 10, ¢), whilst, along the mesial furrow, they form 
Similar zooids are 
an irregular longitudinal series (fig. 9). 
found, also, partly, between the cells, where, they appear, 
singly, and partly, on the cell itself (fig. 10, e). 
Below the developed cells, many almost transversal 
series of undeveloped cells (2—3 in each series) are ob- 
served, and between these, solitary zooids are found. 
The ventral surface is somewhat arched, and has, 
along its middle, a cylindrical, strongly protuberant bare 
keel, which is clear as water, and appears as if, it was a 
slender glass-rod placed along the mesial line of this surface 
(fig. 10, f). On each side of this keel, two longitudinal 
series of zooids are observed (fig. 1U, g); these are some- 
what more elevated than those of the dorsal surface. 
The cells are richly beset with, larger and smaller, 
rod-like, triangular spicules, which are clear as water; 
but an extreme few have a reddish tinge, which however, 
is so faint, that it can only be observed on very close 
attention being paid to it. The spicules measure from 
0,222" _ 1,023" in length, and from 0.041—0.055"" in 
breadth; and they are arranged in such manner, that in 
the mesial part of the cell, they are found placed, almost, 
in a straight line, whilst, on the sides, they radiate from 
the mesial line in tan-shape, and they, thus, collect together 
