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Thenaria with a broad pedal disc and distinet basilar muscles. 
Column without marginal sphaerules, verrueæ and vesicles, divisible 
in scapus and capitulum. Tentacles fewer (always?) than mesen- 
teries, retractile. Longitudinal muscles of tentacles and radial 
muscles of oral disc mesogloeal. No sphineter or a weak, diffuse. 
Six pairs of macroenemes with filaments, gonads and strong re- 
tractors. Microenemes without these organs, in the lower part 
more numerous than in the upper (always?) 
For reasons, which I will give in another paper, I maintain the 
group Thenaria, as I cannot accept Stephenson’s groups Endomy- 
aria and Mesomyaria. 
Genus Condylanthus. 
Di agn osi s. Condylanthidae with well developed pedal disc. 
Column divisible in scapus and capitulum without papillae or warts. 
Scapus provided with cuticle. Ectoderm of the capitulum with spiro- 
cysts. Sphineter weak diffuse or absent. Tentacles short, consider- 
ably fewer than mesenteries. Longitudinal muscles of the tentacles 
and radial muscles of the oral disc mesogloeal. The six pairs of 
macroenemes with pinnate circumscript pennons and very strong 
parietal muscles. 2 pairs of directives. Microenemes without muscle 
pennons, those of the second order recalling the parietal part of those 
of the first. Basilar muscles well developed. 
The diagnosis of the genus Condylanthus is here altered because 
a renewed examination of the very bad preserved tentacles and oral 
disc in the examined type-specimen of C. magellanicus has shown 
that the longitudinal muscles of tentacles and oral disc are meso¬ 
gloeal and not ectodermal. In another paper I will give a more 
complete description of the geno-type, based on examination of new 
material better preserved. The species, described below, is separated 
from C. magellanicus by the structure of the parietobasilar muscles 
and the pennons. Below the actinopharynx the parietobasilar muscles 
form no deeper fold and are more robust in aucklandicus than in 
magellanicus, in which they are very broad and form a very deep but 
thin fold. The muscle folds of the pennons are also comparatively 
more ramificated in aucklandicus than in magellanicus. 
