200 General Notes. — [ Feb. 
cyst. The posterior tapering end of the scolex, however, was 
clothed with the straight, fine hair-like bristles noticed in the 
Rhynchobothrium embryo. 
bothria are four in number, in opposite, lateral pairs, 
backward, and ‘with a retractile proboscis, armed with long, 
slender, slightly recurved hooks, belonging to each bothrium. 
(Figs. 11 æ and 11 4.) The proboscides were everted but a short 
distance, but they were apparently as fully developed as those in - 
the Rhyrichobothrium embryo. The proboscis-sheaths were in 
spirals and the contractile bulbs slender. A reticulated system 
of vessels in the margins of the bothria, and sinuous longi- 
tudinal vessels behind the contractile bulbs and near the edge 
of the blastocyst, were made out in the living specimen. 
In a specimen which was lightly stained with carmine and 
placed in glycerine, the scolex and body part of the blastocyst 
are red, while the globular head-like part of the blastocyst is a 
golden yellow, the carmine only showing faintly in some longi- 
tudinal central vessels, which apparently belong to the water 
vascular system. This same part in unstained specimens in al- 
cohol is yellowish and more opaque than the body, which is 
white with a faint bluish tinge. 
The development of this form differs at this period from that 
of the Rhynchobothrium described, in that the blastocyst is re- 
tained as a part of the scolex after the latter is released. I have 
repeatedly tried the experiment of opening blastocysts of these 
two types, with the results in every case as given above. 
one case, the embryo does not seem to have any vital connection 
with the blastocyst when the walls of the latter are broken. In 
the other, the embryo cannot be removed from the blastocyst ~ 
except by breaking a connecting bond. Whether, in the latter 
instance, the blastocyst becomes a part of the adult strobile by 
giving rise to segments by absorption or otherwise, or whether 
-it is evanescent, I have, as yet, had no opportunity of observing. 
—Edwin Linton, Wood’s Holl, Mass., August 31, 1886. 
EXPLANATION OF PLATE. 
Fic. 1. Cyst from peritoneum of Pomatomus saltatrix containing endocyst, en- 
about two diameters. 
ocyst released from its cyst, somewhat flattened under the compressor 
P3 . = ph a ar 5 ane Ary Se | El 1 Mi VEEE WERE 
: ona Embryo liberated from the endocyst (or blastocyst), lateral view, enlarged 
ameters. 
Fic. 3 a. One of the bothria, isolated, enlarged three diameters. __ 
oo Fic. 4. ‘he same flattened under the compressor, showing the contractile bulbs, 
__ the spiral proboscis-sheaths, and the protruded proboscides, enlarged six diameters. 
Fic. 5. Posterior end of same, showing the termination of the vessels of the water _ 
