166 A Bare Melicertian. 



the Floscules and the ciliated lohes of the Melicertians is equally 

 absonant, and for this we shall substitute and henceforth apply the 

 term Corona. And following a good example* in the matter of 

 aspects, we shall employ Neural to indicate the ganghon side and 

 Ssemal the opposite, and further, shall characterize the active 

 vibratile appendages of the corona as Cilia in contradistinction to 

 the Seta?, which perform an intermittent action when investing the 

 corona ; and for want of a more appropriate term we must apply 

 this also to the delicate hairs which furnish the pistons of the 

 antennae. 



StepJianoceros Horaiii. 



The obvious diversity of the form and position of the corona of 

 the Floscularians clearly and indisputably separate them from a 

 Family association with the Melicertians in which the corona sub- 

 tends the mouth ; and moreover, while the members of the former 

 manifest a true bilaterality by the preponderance of the neural 

 margin of the corona, no such bilaterality obtains either with 

 Stephanoceros or with the miscalled F. coronetta. The corona of the 

 Floseularia is, as generically characterized in reference to the lobes, 

 sliort, hroad, hiohhed, exjpanded ; while the tentacles of both 

 Stephanoeeros and this species are lon(/, slender, and erect; we see 

 further that the corona of the Floscules is, with one exception, beset 

 with setsB upon the lobes only, while the whole margin of the 

 corona of Steyhanoceros and of this species is invested in one con- 

 tinuous series. We see also that these two Forms are identical in 

 other points of their economy, and are of a higher type of organiza- 

 tion than that of the Floscules, first as regards their nervous, mus- 

 cular, alimentary systems, and further in the fact that the stage 

 which supports the tentacles of Stejplianoceros and F. coronetta acts 

 in the double capacity of the calix apd lophophore of the Fresh- 

 Water Polyzoa, and like these Forms they possess an epistome, 

 which is situated just above the ganglion, they both manifest an 

 organic attachment of the tunicle, and perform palpable invaginations 

 of what may, for the sake of argument, be termed the endocyst with 

 every retraction of the corona — points which establish a homological 

 identity with the so-called F. coronetta, and Steplianoceros Eichornii, 

 and as such it wiU in future be denominated Stephanoceros Horatii. 



The Family Melicertad^e. 



We now come to a consideration of the Melicertians, and with 

 these we find that the corona subtends the mouth, that, whether 

 simple or serrated, its periphery is continuous and unbroken, and is 

 furnished with an uninterrupted range of active vibratile cilia, 



* Allman's ' Fresh-water Polj^zoa.' 



