H. J. Clark on Lucernaria. 355 
Gymnophthalmata. The only relation that it possibly can be 
considered under is that of a correlation to both types of Acalephe, 
—viz.: to the Gymnophthalmata, including the Siphonophore, 
and to the Steganophthalmata; yet not as a graduated con- 
the reptiles ; but, at the same time, containing organic features 
which separate each of them as a type from the others. 
Tn order that no confusion may arise here, I would state most 
explicitly that I do not consider the Ctenophore as one of the 
orders of Acalephze, but deem them to be a class by themselves, 
_ €qual in value to either of the classes of Radiata, whether Polypi, 
Acaleph, or Echinodermata, and standing next in rank to the 
Echinodermata. The division of the alimentary system of Cte- 
hophoree into two portions, as among Polypi, is sufficient to sep- 
arate them from the Acalephe, since the typical form of the 
Corresponding system in the latter is a wnity ; moreover, the 
é ‘ y 
position and peculiar relations of the tentacles of Ctenophoreg 
are hardly of less importance, in these considerations, as dis-. 
‘inetive characters. I cannot conceive that the Ctenophors ma 
be included in the same classific type with the Acalephx without 
doing violence to correlative ideas such as are expressed in the 
fganism of the former; and much less can I admit that they 
have the most distant relation to the Polypi, excepting that, like 
the latter, they are Radiates. The same kind of arguments that 
have been used to show that Ctenophore and Polypi belong to 
one class might, with equal justice, be advanced to prove that 
€ Acalephze are Polypi. We must not mistake a similarity for 
an identity, any more than that the cry of a child would identify 
it with a cat, because their voices sound alike, and cannot always 
be distinguished the one from the other by any single faculty of 
ur sen 
ses, 
The following tabular view presents at a glance the 
of the Lucernarie to the other orders of Acalephee, and at the 
_ Same time indicates the position of the Ctenophoras among the 
* other classes of Radiata. 
Potrer, ACALEPH. CTENOPHOR#. EcutnopERMATA, 
Stegano; h- 
thalinsta. 
thalmata. 
. 
