KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 39. N:0 l. 97 
the whole, however, there seems more reason, as we have indicated, to refer the spe- 
cies to the genus Phascolion.'”' 
According to my opinion, the above cited six parallels of SELENKA would seem 
much more applicable if drawn between the species "squamatum'” and the genus 
Onchnesoma rather than between the former and the genus Phascolion, as SELENKA 
has done. In fact, there exists an obvious conformity between the former pair, 
especially after my restricting of the genus Onchnesoma by eliminating two species 
"Sarsi” and "glaciale" as non-relatives, and only retaiming the species ”Steenstrupi” 
as a type of the genus. Only with regard to the tentacles does a differens of any 
importance occur, but considering the great individual fluctuation as to the number 
of the tentacles, it may be a question, whether the presence or absence of them 
can be of generic value. Compare my remarks on the genus Phascolosoma, which 
exhibits so many variations with regard to the tentacles. But, if it be so, the spe- 
cies "squamatum'"" must indubitably represent the type of a new genus. For the 
present the species in question may be claimed as belonging to the genus Onch- 
nesoma. 
The largest specimen examined by me has a length of 30 mm.; the trunk 
measuring 7 mm. and the proboscis 23 mm. The general shape of the body will be 
best understood by looking at Figs: 153--155. The brown or ferruginous trunk 
is covered with irregularly formed, inerusted scales of varying sizes, (Fig. 156), 
which at the base of the proboscis become more scattered and show a nearly trian- 
gular shape. Between the scales, which have their free edges directed backwards, 
scattered true papille are to be seen in connection with glands. I do not understand 
SELENKA when he says: "It [O. squamatum) may be ranked as a species af Phasco- 
lion on account of the development of the ordinary dermal papille into attaching 
papille.” In fact, the attaching papille, characteristic of the genus Phascolion, are 
transformed true papille in connection with glands, are directed forwards with their 
free points, and have nothing to do with the incerusted scales in question. The long 
and narrow, yellow or white, proboscis is almost transparent, and shows a number 
of minute, scattered papille, which do not seem to be arranged in rows. Close be- 
hind the tentacular crown the proboscis shows a narrow annular space confined po- 
steriorly by a small fold, which seems to have escaped the notice of my predecessors. 
The space referred to is, like the tentacles, ciliated. The tentacles (Figs. 214—215) 
are small, but distinet and 8 or 9 in number; they are of an ordinary shape and 
not thread-like or filiform, as has been stated by SELENKA and KOREN & DANI- 
ELSSEN. 
There is only a single, free, bag-shaped segmental organ. I can not agree with 
SELENKA, who says that it is fixed by means of a mesentery. The single retractor 
muscle has two very short roots (according to KOREN and DANIELSSEN four roots), 
inserted at the hinder end of the body. 
The intestine (Figs. 183—184) shows a distinct spiral, composed of from 10 
to 12 double twists, and possesses a small divertiele at the transition to the rectum. 
KOREN and DANIELSSEN are wrong when they write: "The anal aperture round and 
