This historic book may have numerous typos and missing text.
Purchasers can download a free scanned copy of the original book
(without typos) from the publisher. Not indexed. Not illustrated.
1915 Excerpt: ...of the lumen of the hydrocoele and of its lobes
were also modeled. For making the reconstructions Bom's method was
employed, with plates of beeswax brought to the proper consistency
by mixing with Venice turpentine. All of the drawings were made
from camera-lucida outlines taken with Zeiss objective and oculars
4 and 6. Figures 4 to 15 were again 129 enlarged with camera
drawings magnifying to twice the number of diameters. Figures 2 to
15 have been taken from the 55-hour specimens, all others from the
29. INTERNAL STRUCTURE. The body of the 29-hour plutei of Laganum
is ovoid in shape, in some cases almost spherical, with a flattened
or slightly concave anterior surface (fig. 1). Two larval arms grow
out from a position somewhat dorsal to the center of the
antero-lateral regions. In the 55-hour specimens, the body has
elongated slightly and the posterior end has become somewhat
pointed. In the earlier stage the arms extend outward at an angle
of about 60 from the body, while in the older form they are more
slender and reach upward nearly parallel to each other. An opening
to the exterior lies in the center or slightly to the right of the
center of the flattened anterior surface. It may be seen readily in
the whole mount, but no other opening can be observed. The animal
itself is exceedingly opaque, so that no study of the internal
organs could be made except in specimens especially fixed and
bleached for observance of the skeletal structures. Unfortunately,
in this detailed treatment the tissues were so largely destroyed
that study of them was impossible. Among the specimens studied,
about fifty in all, I have found three which show interesting
variation in structure--two with 3 larval arms, and one with 5. In
the former case the third larval arm arises fro...
|Country of origin:
Carnegie Institution Laboratory
||246 x 189 x 6mm (L x W x T)
||Paperback - Trade
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