62 
Craspedommata Bock 1913, but these eyes are not strictly typical 
marginal eyes, as they do not as usual follow the margin closely. 
The position of the pharynx immediately behind the brain, 
thus confined to the anterior part of the body, is quite atypical 
for an Acotylean. This feature is still more pronounced in the 
Gilbertean species, the pharynx being extremely short, showing a 
tubular form. Thus the pharynx of the new species approaches 
the type acquired by the Euryleptids among the Cotylea, a rather 
interesting case of parallel evolution. 
Dr. Mortensen’s collection has afforded an increased knowledge 
as to the li ving habits of Emprosthopharynx opisthoporus. No notes 
accompanied the specimen of the Eugenie-Expedition. But it is 
not improbable, that just an occurrence with a Pagurid might have 
caused that attention was paid to it and it was conclusively pre- 
served. Turbellarians were otherwise not collected during this 
expedition. 
On Plate II a, Fig. 7, I give a reproduction of the body-shape 
of one of the animals collected by Dr. Mortensen. Usually the 
specimens are elongated oval, but sometimes they show a nearly 
rounded outline. Without exceptions the specimens are all devoid 
of body pigmentation. In preserved State they have a milk- to 
cream-colour. 
The largest specimen measures 19 mm in length and 8 mm in 
breadth, the smallest SVs and 3 mm respectively. On simply an 
ocular examination it is impossible to detect any tentacles. However, 
with the help of the microscope I succeeded to barely guess at 
the presence of tentacular rudiments in a couple of individuals. 
In an animal cut in a series of longitudinal sections they are, 
however, so undeveloped that they are hardly identifiable. Fig. 5 
on Plate II a represents a photograph of a section through the 
tentacular region. There is no difficulty to recognize this by means 
of the tentacular eyes, which are far more superficially located 
than the others. It is clearly visible on the photograph repro- 
duced how the greater part of the dorsal muscle wall is discontinuous 
in the tentacular region, leaving a sufficient Space for the group 
of tentacular eyes. It is rather remarkable that none of these 
eyes occur below the line drawn as continuation of the in- 
terior limit of the dorsal muscle wall of the body. The dense 
