ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
315 
In another paper* * * § he has notes on numerous forms, including Dochmius 
Vallei sp. n. from the intestine of Vipera ammodytes , the Agamonema 
stage of Ascaris rubicundse from the lungs of Python reticulatus , Tsenia 
varanii sp. n. from the intestine of Varanus arenarius, Anthobothrium 
parvum sp. n. from the intestine of Zygsena malleus , and many others. 
Notes on Nematodes.f — Dr. von Linstow describes Filaria ( Dis - 
pharagus ) anthuris Rud. from Corvidae and other birds. His description 
illustrates an almost unparalleled detail of measurement, e.g. of the 
thickness of cuticula, cutis I., and cutis II. in male and female. In 
fact, we think the patient author overdoes it. The absence of a lumen 
in the intestine, of male as well as of female, is striking. 
He also describes the larva of Ascaris Eperlani from the dorsal 
musculature of Osmerus eperlanus, Physaloptera Sonsinoi sp. n. from 
Agama mutabilis , Bhabditis Lumbriculi sp. n. from Lumbriculus variegatus , 
and Ascaris osculata Rud. from the alimentary canal of seals and the like. 
Platyhelminthes. 
Lacustrine Species of Macrorhynchus.^ — Dr. G. du Plessis has 
found in Lake Geneva a Rhabdocoele exceedingly like Macrorhynchus 
helgolandicus Metschn., but differing in two essential points. The 
proboscis has a canal, a terminal pore, and basal unicellular glands ; 
the two sinuous water-vascular trunks are united at the tail in a 
contractile pyriform vesicle. 
The author has found in Lake Geneva five new worms of indubitably 
marine origin — the species above referred to, Macrorhynchus lemanus 
sp. n., Emea lacustris , Monotus Morgiense , and Plagiostoma Lemani. 
Asexual Multiplication in Turbellarians.§ — Herr Yogt gives a 
summary of observations made by himself and others. He has worked 
out an interesting series. In Planaria alpina he has observed that over- 
eating is followed by rupture ; the separation of a part may occur without 
any stimulus but abundant nutrition. In P. alpina , P. albissima , and 
Bipalium hewense , constriction occurs without any preparatory process 
whatever. The plane of division is not fixed in P. alpina or Bp. hewense ; 
it may be in front of or behind the mouth ; in P. albissima it is always 
where the oesophagus enters the intestine. In none of these three cases 
is it a regularly occurring reproductive act. In Polycelis cornuta , the 
plane of division is in a definite zone, the division is a normal process 
of reproduction in all individuals, and the formation of the gullet has 
begun before the separation. In Planaria subtentaculata , the new head 
has begun before the tail portion is separated off. In Planaria jissipara , 
finally, the division is preceded by complex processes of absorption and 
regeneration, all the new organs being formed before the separation is 
effected. The general result is that the asexual reproduction is traceable 
to a simple regenerative process. 
New Flukes in American Rabbits. |j — Dr. C. W. Stiles communi- 
cates to the Zoological Society of France a short notice of a new species 
* Tom. cit., pp. 33-46 (3 pis.). 
f Arch. f. Mikr. Anat., xliv. (1895) pp. 509-33 (2 pis.). 
X Zool. Anzeig., xviii. (1895) pp. 25-7. 
§ Biol. Centralbl., xiv. (1894) pp. 745-51, 771-7. 
|| Bull. Soc. Zool. France, xix. (1894) pp. 160-2 (1 fig.). 
