ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
389 
ductive apparatus, and several less obvious peculiarities, tlie structure 
of Diploposthe Isevis Dies, is essentially simple, and recalls the Micro- 
taenia; of mammals, e.g. Tsenia diminuta Rud. and T. relicta Zsch. 
Gonads of Amabilia.* * * § — Dr. Y. Diamare describes the gonads of the 
remarkable tapeworm Amabilia lamelligera ( = Tsenia lamelligera Owen, 
and probably = T. macrorhyncha Rudolplii). Owen noted the remark- 
able lamellar structures on the sides of the proglottides, and the presence 
of a penis on each side ; but the peculiarities do not end here. The 
author sums up in the following diagnosis: — There are two penes, the 
end-organs of a single vas deferens, which runs in a zigzag from one end 
of the joint to the other ; the testes are in the form of fine clusters like 
grape-bunches, and occupy the upper surface of the joint ; the single 
almost straight vagina lies across the vas deferens ventrally, and is in 
close connection with it ; it opens on the middle line both dorsally and 
ventrally ; the ovary is single and median, and the oviduct is also single ; 
the yolk-gland has many lobes and a long yolk-duct ; the uterus is like 
a flattened cage enclosing the ovaries : the eggs are enclosed in spindle- 
shaped capsules. 
In the course of some systematic notes, the author expresses his 
conviction that the genus Diploposthe , recently proposed by Jacobi, is 
an unnecessary synonym for Amabilia , and that T. Isevis St. is either 
A. lamelligera or a related species. 
Cysticercus venusta.f — Mr. T. B. Rosseter found this new Cysii- 
cercus in Cypris cinerea , along with Cysticercus gracilis and C. coronula. 
After repeated failures he succeeded in rearing the tapeworm in the 
domestic duck. After comparing it in detail with the other (six) tape- 
worms of birds whose rostellum bears eight hooks, he finds himself 
justified in establishing a new species — Tsenia venusta. 
Cysticercus of Taenia liophallus.f — Mr. T. B. Rosseter has succeeded 
in finding the hitherto unknown Cysticercus stage of Tsenia liophallus , a 
parasite of the swan and probably also of the duck. The bladder-worm 
was found in Cypris cinerea in an old pond near Canterbury. 
Studies on Tetrarhyncha.§ — Dr. Th. Pintner describes a Tetra- 
rhynch larval form found in the muscle of a fish which was in process of 
digestion in the stomach of species of Heptanchus. His study is espe- 
cially noteworthy, because of the discovery of a new organ. On each 
side of the body-margin, sometimes just above the excretory vessels, 
sometimes between these and the more lateral nerve-strand, there is a 
canal with delicate walls and variable diameter. At the anterior end it 
bends round in an arch, like the excretory vessels and nervous system. 
On the margin of the bladder posteriorly it becomes more irregular, and 
gives off small branches which, by uniting again with the main canal, 
enclose little islands. In the region of the excretory vesicle it seems to 
break up into a sort of plexus. Sections show that the whole canal is 
* Centralbl. f. Bakt. u. Par., xxi. (1897) pp. 862-72 (8 figs.). 
t Journ. Quekett Micr. Club, vi. (1897) pp. 305-13 (2 pis.). 
X Tom. cit., pp. 314-7. 
§ SB. K. Akad. Wiss. Wien, cv. (1896) pp. 652-82 (4 pis.). 
