the hypothetical
ancestors II. and III., capable of either locomotion or fixation at
will, were either differentiated into alternating generations of fixed
sterile nutritive hydroids (scyphistomoids) and locomotor sexual
medusoids, or abandoned the power of fixation in hypogenetic cases.
During the period represented by the line of descent--III. to
Anthozoa--this group abandoned its power of adult locomotion by
swimming. During these periods were also attained those less important
structural characters which these three groups present to-day.
(G. H. Fo.)

Hydromedusae. Scyphomedusae. Anthozoa.
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\ III.
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Ctenophora? \ /
\ II.
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I.

COELLO, ALONSO SANCHEZ (1515-1590), Spanish painter, according to some
authorities a native of Portugal, was born, according to others, at
Benifacio, near the city of Valencia. He studied many years in Italy;
and returning to Spain in 1541 he settled at Madrid, and worked on
religious themes for most of the palaces and larger churches. He was a
follower of Titian, and, like him, excelled in portraits and single
figures, elaborating the textures of his armours, draperies, and such
accessories in a manner so masterly as strongly to influence Velazquez
in his treatment of like objects. Many of his pictures were destroyed in
the fires that consumed the Madrid and Prado palaces, but many good
examples are yet extant, among which may be noted the portraits of the
infantes Carlos and Isabella, now in the Madrid gallery, and the St
Sebastian painted in the church of San Geronimo, also in Madrid. Coello
left a daughter, Isabella Sanchez, who studied under him, and painted
excellent portraits.

COELLO, ANTONIO (1610?-1652), Spanish dramatist and poet, was born at
Madr