ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
201 
Vibratile Tags of Asplanchna amphora.* — Mr. C. Rousselet states 
that there are about forty vibratile tags on each side ; in shape they are 
like elongated and compressed cups ; the cup is closed by a very 
delicate spongy protoplasm, probably quite open enough to allow part 
of the fluid of the body-cavity to pass through. 
Notes on Rotifers-t — Mr. G. Western calls attention to a free- 
swimming Lacinularia which he calls L. natans , and to a new form 
resembling an Asplanchnopus, but apparently the type of a new genus, 
which he found in the river at Guildford. 
Dinops longipes.J — Mr. C. Rousselet applies this name to a Rotifer 
which has hitherto been placed with Asplanchna , but it has a distinct 
intestine and cloaca, and among the jaw-parts are the manubrium and 
uncus which are wanting in Asplanchna. 
Organization of Cephalodiscus dodecalophus.§ — Prof. A. Lang 
regards Cephalodiscus as, with Balanoglossus , a member of the Entero- 
pneusta. He looks on the organization of the latter as adapted to a 
limicolous and limivorous mode of life, and that of the former to a 
tubicolous and semi-sedentary one. Moreover, the organization of 
Cephalodiscus rests at a point which corresponds to an early stage of 
Balanoglossus. He does not, however, regard the form as a primitive 
one, but rather as an altered and simplified Balanoglossus which has 
been affected by its mode of life. The absence of the blood- vascular 
system may be connected with the small size of the body. Less weight 
is to be laid on the number of gill-clefts and gonads. 
The resemblance of Cephalodiscus to the Bryozoa and to Phoronis is 
merely a convergence-phenomenon, due to adaptation to a similar mode 
of life. The presence of gill-clefts is a great obstacle to any thought of 
affinity, for even if the Bryozoa were regarded as being descended from 
Cephalodiscus-like forms, the disappearance of the gill-clefts would 
remain unexplained. 
Anatomy and Histology of Phoronis. || — Dr. C. J. Cori gives a long 
account of the structure of this animal, the systematic position of which 
has been so long a matter of doubt. He points out that the Phoronida 
and Bryozoa agree in the possession of a true coelom ; both have, at 
the anterior end of their bodies, a horseshoe-shaped crown of tentacles 
within which is set the mouth ; this last may be closed by a lip-like 
process, the epistome ; and, lastly, the anus always lies near the 
mouth. 
The coelom of both is divided into an upper and a lower portion by 
a partition stretched across in a direction transverse to the axis of the 
oesophagus. The upper cavity may be called the tentacular-coronal 
cavity, the lower the body-cavity ; the former is made up of the cavities 
of the lophophore and epistome and of the tentacles. The body-cavity of 
the Bryozoa is an undivided space, but that of Phoronis is broken up by 
a number of enteric mesenteries. In the tentacular cavity there is on 
the anal side the ganglion, and from the same side there arises the 
* Joum. Quek. Micr. Club, iv. (1891) pp. 241-2 (3 figs.). 
t T. c., pp. 254-8 (1 pi.). % T. c., p. 263. 
§ Jenaisehe Zeitschr. f. Naturwiss., xxv. (1890) pp. 1-12. 
II Zeitschr. f. Wiss. Zool., xli. (1890) pp. 480-568 (7 pis.). 
