ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
571 
sum R. (in the lungs), and a larva of Olostoma encapsulcd in the muscles 
and connective-tissue. 
y. Platyhelminthes. 
French Nemertinea.* — M. L. Joubin has contributed to the scries 
called 4 Faune Frangaise ’ a volume treating of the Nemertean worms 
found on the coast of France. A general account is given in order to 
enable the student to understand the morphology and chorology of the 
group, and to know how to seek for and how to preserve these worms. 
This is followed by a special account of the species, of which ninety-five 
are recognized. This is a number which exceeds what one might have 
expected, but it is to be remembered that the French coasts exhibit 
very great differences. 
Turbellaria-Fauna of Basle, j — Herr 0. Fahrmann has found 33 
rhabdocoele and five dendroccele Turbellaria in the neighbourhood of 
Basle. Four new species of Mesostomum have been found, and a number 
of new forms of Vortex. Emea lacustris, the freshwater Nemertine lately 
found by Duplessis * near Geneva, has also been found near Basle. 
New Tristomid.§ — M. P. Cerfontaine describes a new Tristomid 
taken from the gills of Baja batis from Ostend ; on account of the great 
complication of the posterior sucker, and the translucency of the living 
worm, he calls it Merizocotyle diaphanum. It is about 6 mm. long and 
1 • 5 mm. wide ; the hinder sucker is proportionately large, is fixed in a 
short stalk, and is nearly circular in form ; its concave face is broken 
up into a number of chambers, of which one is central, six intermediate, 
and eighteen peripheral ; of these last the posterior is curiously produced 
forwards and upwards, so as to extend on to the dorsal surface. The 
central and intermediate chambers are surrounded by a muscular pad ; 
a number of hooks, of two sizes, are found on the suckers. The most 
striking point about the muscles is their transverse striation. Short 
notes are given, in this preliminary communication, on the digestive and 
reproductive organs, and the systematic position of the new genus is 
shown in the accompanying table : — 
I Temnocephalese [ Tristomidse j Calicotyle. 
Tristomese - - - Monocotylidse - < Monocotyle. 
Polystomese ( Udonellidse ( Merizocotyle. 
Striated Muscular Fibres in a Trematode.j] — M. P. Cerfontaine 
devotes a special note to this trait in the subject of the foregoing note ; 
after a brief description of the histological appearances, he reminds the 
reader, as so many have done before him, of the brothers Hertwig’s 
division of the Coelomata into Pseudocoelida and Enterocoelida, and 
points out that while the Trematodes are typical members of the first 
group, the muscles exhibit the structure characteristic of the second. 
He reminds the student, further, that Marshall proved the possession of 
fibrillar muscular elements by Helix and Pecten, which belong to the 
Pseudocoelida; moreover, Yan Beneden and Julin have described, 
* ‘ Faune FranQaise. Les Nemertiens,’ Paris, 1894, 8vo, 235 pp., 4 pis. 
t Zool. Anzeig., xvii. (1894) pp. 133-5. X See ante, p. 202. 
§ Bull. Acad. Roy. Belg., lxiv. (1894) pp. 936-48 (6 figs.). 
|| Tom. cit., pp. 949-54 (3 figs.). 
