ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
211 
B. rectangulus Rud. Ho rejects si number of other species, aud gives a 
key to the distinctive characters and distribution of those which ho 
recognizes. 
Length of Life of Ccenurus.* — Prof. A. Railliet had under his obser- 
vation from 31st March, 1889, to 4th March, 1891, a Rabbit which 
was, when he got it, the host of a Ccenurus as large as a nut on its right 
leg. Before its death another as large as an apple appeared near its 
right shoulder. He concludes that Ccenurus may live as such for more 
than two years. 
Experimental Development of Cysticercus tenuicollis in the Kid.t 
- — Prof. A. Railliet fed a kid with Taenia marginata on the 20th June, 
and on the 29th the patient died. The liver was found to be gorged 
with blood, in which an enormous number of small vesicles were swim- 
ming ; these were the embryos of the Tape-worm. Of the other organs 
of the body the lungs alone gave indications of the invasion of the 
parasite. 
Presence of Taenia nana in America. J — Hr. R. Blanchard reports 
the presence of Taenia ( Hymenolepis ) nana in an Argentine sailor w ho 
died at Buenos Ayres. Dr. Spooner appears to have observed the 
parasite in North America in 1872. 
Migrations of Taenia gracilis.§ — M. R. Blanchard has been able to 
work out the parasite found by Mr. T. Scott in the freshwater Ostracod 
Candona ro&trata ; it is the Cysticercoid stage of Taenia gracilis , which in 
the mature condition is found in Ducks. The young found by Linstow 
in the Perch, doubtless entered by mistake, being swallowed with their 
Crustacean hosts, but they would not mature in the fish. 
5. Incertse Sedis. 
Growth and Metamorphosis of Tornaria.|| — Mr. T. H. Morgan 
believes that the similarities of Tornaria to the Echinoderm-larva are 
not to be explained by calling them superficial resemblances ; they 
appear to have profound morphological significance. The details in 
common are very striking ; thus the anterior enterocoel and its dorsal 
water-pore are identical in the two ; some Auriculariae have at least a 
pair of pores, and Cephalodiscus, which is undoubtedly allied to Balano- 
glossus (the adult form of Tornaria ) has two such pores. The formation 
of muscles from the cells of the inner wall of the enterocoel is seen in 
both groups ; in both there is an intimate connection between a part of 
the enterocoel and the so-called heart or anterior blood-vessel ; in both 
a mesenchymatous vesicle is closely connected with the anterior 
enterocoel ; wandering mesenchyme in the blastocoel is seen in both, and 
it is important to note that, also in both, there is an accumulation of 
many mesenchyme-cells around the endodermal oesophagus. The 
histology of the ciliated band is exactly the same in Tornaria and 
Auricularia, while the sudden and very great diminution in size of the 
larvae at the time of metamorphosis is a very striking phenomenon. 
* Bull. Soc. Zool. France, xvi. (1891) pp. 159-60. f Tom. cit., pp. 157-S. 
1 Tom. cit., pp. 165-7. § Tom. cit., pp. 119-22 (1 tig.). 
1| Journ. Morphology, v. (1891) pp. 407-58 (5 pis.). 
