Det er heller ikke godt at forstaa, hvorledes For- 
døielsen og Erneringen skulde kunne foregaa med Lethed, 
naar hele Tarmens indre Flade var overtrukket med en 
Chitinhud, der jo under almindelige Forhold er uigjennem- 
trængelig for Vædske, medmindre den var forsynet med en 
Mangfoldighed af Porer, og noget saadant omtaler ikke 
Prof. Ehlers. Vore Undersøgelser have overbevist os om, 
at Chitinovertrækket ophører ved Spisergrets Begyndelse. 
Saavel hos Priapuloides som hos Priapulus have Mu- 
skelfibrillerne en skraa Stribning. 
Professor Ehlers er den første, der har paavist Nerve- 
systemet hos Priapulus, og vi have ved vore lagttagelser 
saavel over denne Slægt som over Priapuloides ikke alene 
stadfæstet hans Observationer, men ogsaa i histologisk Hen- 
seende fuldstændiggjort dem. 
Fam. Bonellidæ, Baird. 
Hamingia‘ arctica, ». g. 
Tab. IV, V. 
n. 
sp. 
Lacaze-Duthiers omfatter kun 2 Slægter henhørende 
til denne Familie, nemlig Bonellia, Rolando, 'og Thalassema, 
Cuvier. Den af os nu opstillede 3die Slægt, Hamingia, 
have vi troet at maatte henføre til nævnte Familie, omend- 
skjøndt den mangler baade Snabel og Børster, der jo ere 
angivne som Mærker for Familien. Men som senere 
skulle paavise, nærmer Hamingia sig i sin Organisation ikke 
alene til Thalassema, men i væsentlig Grad ogsaa til Bo- 
nellia, saa at vi ikke have kunnet opgive Familieforholdet 
til disse, trods de nævnte Mangler. 
vi 
Bonellia viridis, der først er beskrevet af Rolando, 
tiltrak sig snart Zoologernes Opmærksomhed ved sine Be- 
synderligheder baade i Form og Organisation; men des- 
uagtet hengik omtrent et halvt hundrede Aar, inden dette 
mærkelige Dyrs Organisation blev fuldstændig opklaret. 
Aarsagen laa hovedsagelig i Vanskeligheden ved at erholde 
Dyret levende og i tilstrækkelig Mængde, omendskjønt det 
var temmelig almindeligt endog paa ringe Dybde i Middel- 
havet og paa de korsikanske Kyster. 
Her i Norden er en af os (Koren), den første, der 
for omtrent 40 Aar siden fandt Bonellia viridis ved Ber- 
gen paa en Dybde af 50 Favne, og han paabegyndte den- 
gang en anatomisk Undersøgelse af den, hvilken han af 
Mangel paa fornødent Materiale maatte opgive; thi Bonellia 
viridis er i det Hele taget sjelden ved de norske Kyster, 
1 Hamingja, Lykkegudinde i den nordiske Mythologie. 
20 
Indeed, it is hard to conceive how the animal could 
digest and assimilate its food with faeility, were the whole 
of the inner surface of the intestine invested with a chitin- 
ous skin, impermeable as is the latter, under ordinary con- 
ditions, to all fluid substances, unless abundantly furnished 
with pores, of which no mention is made by Prof. Ehlers. 
Our examination of the new specimens has fully convinced 
us, that the chitinous tunic terminates at the origin ot 
the cesophagus. 
The muscular fibrils 
pulus are obliquely striate. 
Professor Ehlers was the first to show the existence 
of a nervous system in Priapulus; and our investigation 
alike of this genus and of Priapuloides bears out and, his- 
tologically, completes his observations. 
both in Priapuloides and Pria- 
Fam. Bonellidæ, Baird. 
Hamingia‘ arctica, n. g. 
PL IW, Wo 
n. sp. 
According to Lacaze-Duthiers, 2 genera only are 
comprised in the family Bonellide, viz. Bonellia, Rolando, 
and Thalassema, Cuvier. The animal representing the new 
genus established here, we have seen fit to class under this 
family, though wanting in two important characters assigned 
to the latter: bristles and a proboscis. Hamingia, how- 
ever, as will afterwards appear, not only resembles Tha- 
lassema in its general organisation, but Bonellia too, and 
closely; wherefore we could not but regard the animal as 
a nearly related congener, in spite of defective charac- 
teristics. 
Bonellia viridis, first described by Rolando, soon 
drew the attention of zoologists to its numerous peculiar- 
ities of form and organisation; but well nigh half a cen- 
tury was nevertheless to elapse, ere all questions per- 
taining to the economy of this remarkable animal had 
been finally settled. The chief reason of this lay im the 
difficulty of obtaining live-specimens in sufficient number, 
although the animal is rather common than otherwise in 
the Mediterranean, at a trifling depth, and on the coasts 
of Corsica. 
In Northern Europe, the first who met with an ex- 
ample of Bonellia viridis’ was one of ourselves (Koren), 
about 40 years ago, near Bergen, at a depth of 50 fath- 
oms. He commenced an anatomical examination of this 
specimen, but had to break it off from lack of materials; 
for Bonellia viridis is comparatively rare on the Norwegian 
1 Hamingja, the Fortuna of Northern Mythology. 
