8 A. C. OUDEMANS. 
mouth behind the ganglia, and by the absence of one or more 
stylets in the proboscis, and of deep lateral furrows on the 
head, this species, it is true, is a Paleonemertean; but by the 
absence of diverticula of the intestine, of posterior lobes, and 
of cephalic sacs, it approaches more closely to the group 
wherein Hubrecht has placed the families of the Carinellide 
and Cephalotricide. Iam compelled to make a new genus 
for this species, to which genus I will give the name of Cari- 
noma. The species thus is called Carinoma Armandi 
(McInt.), Oud. In the following pages this proceeding will 
find its justification. 
The chief reason McIntosh (25) had for placing this species in 
the genus Valencinia was a certain agreement between this 
species and the one formerly described by him as Valencinia 
lineformis (18). McIntosh, however, made a mistake in, 
arranging a new worm in a genus (Valencinia, Quatr.) which 
he did not know by personal investigation. Sections through 
a specimen of Valencinia longirostris—the species which 
had served as type to the genus Valencinia—would have 
convinced him very soon that Valencinia Armandi can in 
no case be placed in this genus, whilst V. lineformis, McInt., 
probably is a synonym of V. longirostris, Quatr. —at least is 
considered so by Hubrecht (31). 
It will suffice if I explain by what facts especially V. Ar- 
mandi and V. longirostris differ from one another, facts 
which can at the same time serve to characterise the new 
genus which is created for V. Armandi, and to show that 
the relation to Carinella is more intimate. 
McIntosh describes V. Armandi in detail, so that I can 
here be satisfied with a short recapitulation. 
1 In my opinion it is certain, both from the description of V. lineformis 
in his Monograph (18), as from the anatomical facts given in his treatise 
on Val. Armandi (25), that V. lineformis is, just as little as the other, 
a Valencinia, but a form which approaches closely to Cephalotrix 
linearis (Rathke), Oerst. V. lineformis, viz. has two muscular layers 
(one circular and one longitudinal) within its basal membrane, only two great 
longitudinal vascular trunks and two lacune in the head, and the lateral 
nerves are situated between the fibres of the longitudinal muscular coat. 
