gerne ved at passere igjennem de før beskrevne Zooiders 
(Mødrenes) store Mundaabning; thi Sidekanalerne ere luk- 
kede baade for oven og neden. 
Septum transversale, Fig. 12, d, er 6—7”” høit og 
deler det nederste Parti af Bulbus i to Dele, nemlig i Ven- 
tral- og Dorsalkanalen, hvoraf den sidste er videst. Hvor 
Septum transversale ophører, 1—2”” fra Bunden, er 
kun et Rum, Fig. 12, e, hvori begge de nysnævnte Kana- 
ler aabne sig. 
Axen boier sig 1 Dorsalkanalen 6—8”” fra Stilkens 
Bund opad, danner en Anse, der er 10” lang, 2—3”" 
bred og ender haarfint. 
Axeskeden, Fig. 13, g. 14, h, dannes af en temmelig 
tyk Bindeveeysmembran, hvori sees en Mængde FErnærings- 
kanaler, Fig. 16, a, og som baade paa sin ydre og indre 
Veg ere beklædte med Hpithel. Den indre Væg er ved 
stærke Bindevævstraade fæstet til Axens Cuticula. Denne 
er saa stærkt adhæreret til Axen, åt den ikke kan løsnes 
fra samme uden at rives istykker. Hvor Sammenyoxnin- 
gen finder Sted, iagttages en Række af næsten firkantede 
Celler, hvori sees en liden, rund Kjerne, Fig. 15, a. 
Axen er paa den nederste Del af Rachis, der hvor 
Zooidestriben tager sin Begyndelse, 0,267”” bred. Dens 
Grundmasse af fibrillert Bindevæv, som danner 
tætte Lag af koncentriske Ringe, hvoraf nogle synes at 
være tykkere end andre, Fig. 15, b, og hvorimellem sees 
tykke, temmelig tætliggende, radiære Fibre, Fig. 15,c. 16,0. 
Disse radiære Fibre straale ud fra Axens Peripheri, nem- 
lig fra Cuticula henimod Centralstrængen, hvor de ophøre. 
Centralstrængen er elliptisk, 0,071”” bred, og dannes af to 
Lag, et lysere, ydre, Fig. 16, c, og et noget mørkere, 
indre, Fig. 16, d. I Midten af det indre Lag saaes 
paa flere Tversnit en rund Aabning, som tydede hen paa 
en tilstedeværende Centralkanal, der sandsynligvis opfyldes 
mere eller mindre af Kalkkorn, som forøvrigt ere afsatte i 
den hele Centralstræng. 
bestaar 
Axen er overalt gjennemtrængt 
af fine Kalkkorn, og det er kun ved at fjerne disse, at 
dens Bindevævsstruktur kan iagttages. 
Udenfor Axen findes ikke Kalk hos Slægten Svava. 
Slægtskarakter. 
Smaa Søfjære med rudimentære Finner; en Zooide- 
stribe paa hver Side af Stilken, hvor Generationsorga- 
nerne rage ind i de to Sidekanaler og udvikle der Kjøns- 
produktet. Kalkaxen har en elliptisk Centralstræng og er 
rig paa radiære Fibre. Sarcosoma, Celler, Polyper uden 
Kalk. 
altsaa 
able to ascertain, the young ones are born, by passing > 
through the previously deseribed large zooidal (the mater- 
nal) oral aperture; because, the lateral canals are closed 
both above and below. 
The transversal septum (fig. 12, d) is 6—7”” high. 
and divides the lower portion of the bulb into two parts; 
namely, the ventral, and the dorsal canal, of which, the last 
named, is the widest. Where the transversal septum 
ceases, 1—2”” from the bottom, there is, therefore, only a 
space (fig. 12, e) in which both the canals just spoken of 
debouch. 
The axis becomes curved in the dorsal canal, 6—8"” 
from the base of the stem. Upwards, it forms a hook, 
which is 10”” long, 2—3”" broad, and terminates fine as 
a har. 
The sheath of the axis (fig. 13, g. 14, h) is formed 
of a pretty thick connective-tissue membrane, in which, a 
multitude of nutrient canals (fig. 16,a), is seen, and which 
are clad, both on their inner and outer walls, with epi- 
thelium. 
is attached to the cuticula of the 
The cuticula 
is so strongly adherent to the axis, that it cannot be sep- 
arated from it, without being torn in pieces. Where the 
concretion takes place, a series of nearly quadrangular 
The inner wall 
axis, by strong filaments of connective-tissue. 
cells is seen, in which a small round nucleus is observed 
(fig. 15, a). 
At the lower part of the rachis; where the zooidal 
stripe commences; the axis is 0.267" broad. It's compo- 
nent substance consists, of fibrillous connective-tissue, which 
forms close layers of concentric rings, of which, some ap- 
pear to be thicker than others, (fig. 15, b) and between 
which; thick, rather closely set, radiating fibres are seen 
(figs. 13, c. 16, b). These radiate fibres proceed from the 
periphery of the axis; namely, from the cuticula towards 
the central cord, and there cease. The central cord is 
elliptic, 0.071”” broad; and, is formed of two layers, a 
bright one, (the outer one) (fig. 16, ¢), and a somewhat 
darker one, (the inner one) (fig. 16, d). In several sections, 
a round opening was seen in the middle of the inner 
layer; that suggested the presence of a central canal, 
probably, more or less, filled up with calcareous granules, 
which, otherwise, are found deposited in the entire central 
cord. 
careous granules, and, it is only upon removing these, 
that its connective-tissue structure can be observed. 
The axis is, everywhere, penetrated, by minute cal- 
Except in the axis, lime is not found in the genus 
Svava. 
Generic Character. 
Small sea-pens, with rudimentary fins. Å zooidal 
stripe on each side of the stem, where the generative or- 
gans project into the two lateral canals, and there devel- 
ope the sexual product. The calcareous axis has an el- 
liptic central cord, and is rich in radiate fibre. The sarco- 
soma. cells, and polyps are all non-calcareous. 
