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Transactions of the 
will at once make manifest ; for although they both exhibit a pal- 
pable bilaterality in the corona, they differ essentially in their respec- 
tive characters, for we see in L. socialis that both axes of the disk are 
equal, while in L. albo-jlavicans the horizontal axis is just double 
that of the vertical. Dujardin denies the propriety of their separa- 
tion, but Ehrenberg considers the absence of a divesting theca, and 
the attachment of the ova by a filament to the body, to be sufficient 
grounds for separation. Now the very assumption of the filament 
attaching the ova to the body is the best evidence we could desire, 
to show that the group is invested in a gelatinous matrix. The 
appearance of the filament is simply the microscopical rendering of 
the integument of the theca itself surrounding the ova. Ehren- 
berg’s drawing speaks for itself. 
Alimentary System. 
However dissimilar the organization of the setiferous trochus (a) 
of the one Family may be with the ciliated trochus of the other, 
they are constituted to perform the same functions in the animal’s 
economy as the first instrument employed in securing and directing 
prey to the mouth. In Steplianoceros Eichhornii and S. Horatii the 
corona is invested in one continuous series of setae all along the 
margin of the trochus, but in Floscularia the lobes only are fur- 
nished with these prehensile organs, with the one exception of 
Floscularia canipanulata, where they occur also in one continuous 
and unbroken series. Plate XXIV., Fig. 1. 
In the first Family the alimentary particles, when captured by 
the trochal setae, are directed by their intermittent action into the 
calix ( b ), in which the ciliated cingulum (a!) is situated. I employ 
the term calix to the funnel that precedes the alimentary canal, not 
in its botanical significance of the leaf-like organs that surround and 
support the corolla, as Professor Allman has applied it to the dia- 
phanous membrane surrounding the lower portions of the tentacles 
of the Polyzoa, but in its more general signification of a cup. The 
cingulum creates a vortex within the calix, in which the particles, 
alimentary or otherwise, become involved, passing by its influence 
upwards on the haemal side, and downw r ards on the opposite, where 
they become subjected to the scrutiny of the tongue-like little organ 
the lingula ( c ), that exercises such a marvellous faculty in select- 
ing from the heterogeneous mass those portions which are specially 
qualified for alimentary purposes, and in rejecting others as refuse ; 
and situated on the neural side just above the ganglion (d), within 
the calix, its position and functions are identical with the epistome 
of the Polyzoa. 
The calix communicates, by means of an oesophagus, with a 
capacious chamber, the carcliacus ( e ), and it is seen that alimentary 
