302 General Notes. 
from the sides of the oral cylinder which, as the medusa swims 
through the water, is almost wholly concealed by the sides of the 
bell, and a lower, in anatomical structure resembling the last, 
also arranged in eight pairs in a similar manner, They are, 
however, disconnected from the upper, and are situated at the 
distal end of the oval cylinder. These “crests,” particularly the 
upper, are raised folds or lips thrown into many ruffles, and at 
vertically arranged on the oral cylinder; the lower extending 
around the marginal rim into the mouth cavity of the cylinder. 
Professor Agassiz has already shown that the oral cylinder of 
Stomolophus may be looked upon as the homologue of the eight 
consolidated arms of the Rhizostome medusa. If we imagine the _ 
eight oral tentacles of Stomatonema consolidated into an oral 5 
cylinder, we would have almost exactly the morphology of ie. > 
mouth-parts of Stomolophus. In that consolidation the pe 4 | 
“crests” are what remains of the upper region of suckers andthe f 
lips upon which they arise, while the lower “ crests” or e | 
representatives of the lower lips and their appendages. Int 
fancied consolidation we must suppose a small partition a { 
the upper and lower lines ot sucking mouths, the upper Gh", p 
being separated from the lower by an unbroken and consolidate 
section of the oral cylinder. 
The genus Stomatonema approaches more closely 
homologous with the consolidation of the oral tentacles. | 
this morphology of the organ in question is suppor, 
course of the development of the mouth must be “his not 0t 
proved by those who have opportunities to study Cai 
common medusa in Floridan waters, or on the 3 
Georgian coasts. : 
The genus Stomatonema was taken in Montert p 
a type specimen is in the Mus. Comp. Zool. at Cam 
young of the former genus are attached t 
dy and stomach of the latter, and the 
genera are found in North American waters, 
the accompanying sketch made several years a 
Franca. Although the commensalism of Cona res 
don has never been observed in our North Ameri ore (199 
` tives, the late Professor McCrady many yar McCr. ™ 
discovered in Charleston harbor a Cuma odentia er 
young lives in the bell cavity of a genus to Wig whethet X fi 
name of Turritopsis. It remains yet to w sane nii 3 
species of Glossocodon and Cunina have hk diterranean g” ; 
lationship which has been described in the 
