750 
ZOOLOGICAL LITERATURE. 
vagina ; /. between the fost commencement of the uterine canal and the 
termination of the oviduct there is an enlargement of the latter. In fig. 28, 
pi. 6, we have a very useful diagrammatic representation of the relative 
position of these various parts. The paper is a most valuable contribution to 
the anatomy of the Taenioid worms. 
Coenurm. Dr. Oobbold (Quart. Journ. Mic. Scien. January 1865, pp. 96- 
98) describes a species of Coenurus from the viscera of an American squirrel. 
Echinococcus. Krabbe gives a complete resume of all that is Itnown at 
present on the Echinococcus of the Icelanders. Arch. f. Naturg. 1865, 
pp. 110-126. 
Planaria. 
Knappert (/. c.) gives the following resume of his observa- 
tions on the development of some species of the genus Planaria : — 
1. The egg-cocoons of the freshwater Planaria contain from six to ten small 
ova, surrounded by a mass of nutrient matter (voedingsmassa). 2. The de- 
velopment begins by the segmentation of the contents of the ovum. 3. The 
delicate ovarian membrane disappears altogether in development. 4. The 
contents of the ovum very speedily become distinguished into a central and 
peripheral portion. 6. This latter becomes divided into two layers. 6, The 
more central of these layers developes into the alimentary canal. 7. The 
peripheral stratum becomes developed into the epidermal and muscular 
systems. 8. From the space between these two layers arises the general 
cavity of the body. 9. In the fully grown freshwater Planaria the integu- 
mentary as well as the alimentary system contaijis muscular fibres. 10. The 
general cavity of the body in fully grown examples is also traversed by 
muscular fibre. 
Planaria fusca appears to have been the species principally observed j and 
its development is figured on two plates accompanying the memoir. 
ROTIFEIU. 
[The Recorder lias not met with any papers published in 1865 
relating to this class.] 
