ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
39 
stated by the author that his observations agree very well with those of 
Nusbaum on Pollicipes , a genus of Lepadkbe which, in the opinion of 
Gerstaecker, is most nearly allied to the Balankke. 
Vermes. 
a. Annelida. 
Epithelial Fibrillar Tissue of Annelids.* — M. E. Jourdan justly 
remarks that one often meets in Invertebrates with tissues which it is very 
difficult to refer to the types which we have been in the habit of observ- 
ing in the organs of higher animals. The Annelids are particularly 
remarkable from this point of view, and the subcuticular epithelial 
layer often presents appearances which differ from those of ordinary 
epithelia. 
In the proboscis of Glycerids the author has observed an epithelial 
layer which is represented by irregularly arranged nuclei set in the 
midst of a stroma of small fibres. These fibrils are easily distinguished 
from the muscular fibres of the contractile sheaths of the proboscis ; nor 
can they be regarded as connective tissue. The only possible interpre- 
tation is that the fibres are nervous, although it is, a priori , difficult to 
suppose that they have a nervous function. It is probable that the 
stellate connective tissue described by Claparede in tubicolous Annelids 
belongs to the same group. 
Chsetopterns.t — M. J. Joyeux-Laffuie has prepared a monograph of 
this genus, the new points in which he summarizes in a somewhat novel 
fashion. The cephalic and buccal segments are distinct; there are 
eleven segments in the superior region of the body ; the twelfth and 
thirteenth segments are characterized by the possession of pediculate 
suckers, ventral in position and of assistance in enabling the animal 
to adhere to the inner wall of its tube ; the number of segments of the 
lower half is discussed, and the structure of the integuments described. 
It is well known that the mucus of Clisetopterus is luminous, but the 
author finds that the contents of the glands, so long as they are contained 
in the cellular envelope, are not so. The diverticula of the general 
body-cavity are described, and additions are made to our knowledge of 
the musculature. The nerve-ganglia and the commissures that unite 
them with the nerves given off from them are described in great detail. 
The only sensory organs are the tactile and optic. 
After dealing with the organs in order M. Joyeux-Laffuie describes 
the commensals of the worm, and states that the Bryozoon which he 
called Pelagia chsetopteri should be known by the older name of Hypo- 
phorella expansa. The only properly known species of the genus is 
G. variopedatus. 
A new Alciopid.f — Dr. C. Apstein describes Vanadis fasciata sp. 
n., a new Alciopid found during the cruise of the ‘Galathea’ in the 
North Pacific. It differs from the other numerous species of Vanadis 
chiefly in the abundance, irregular distribution, and large size of the 
* Comptes Rendus, cxi. (1890) pp. 825-6. 
f Arch. Zool. Exper. et Gen., viii. (1890) pp. 245-60 (6 pis.). 
X Zool. Jahrb., v. (1890) pp. 543-5 (1 pi.). 
