SYNOPSIS OF NORTH. AMERICAN INVERTE- 
BRAES: 
XIV. Parr IV. THE ScYPHOMEDUSZ. 
CHAS. Wo HAG iba 
Tue following synopsis is a continuation of that upon Hydro- 
medusee which appeared as XIV of the American Naturatst 
series, during April, May and July, 19or. 
As in the preceding parts, while depending largely upon my 
own records of the Scyphomeduse, I have at the same: time 
drawn freely upon the literature wherever found, but. chiefly 
Heckel’s “System der Medusen”’ and to a less extent Mayer’s 
numerous papers. (Pull. Mus. Comp. Zool.) Fewkes papers, 
chiefly of the same series, including also L. Agassiz, “ Condér. 
Nat. Hist. United States,’ 1862, and A. Agassiz’, “Catalog 
ING Av eAcalephee 1365. 
In only a few cases has any attempt been. made. to present 
accounts of the synonymy of the several species, and then only 
so much as might serve to obviate ambiguity. 
In general form, habit, structure and distribution the Scypho- 
medusze have much in common with the Hydromeduse and 
probably sustain a more intimate relation to them than to any 
other coelenterate Class. : 
They may however be somewhat sharply distinguished by the 
following characters : | 
i, Absence of a true velum. [he velarium of the Cubo- 
medusee has important structural differences, though doubtless 
serving an identical function. : 
2. Sense organs when . present ‘are ‘modified tentacles, 
variously designated as tentaculocysts, rhopalia, etc. 
3. Entodermic origin of sexual products. 
In development there is general, correspondence, between this 
and the preceding Class, In.some. the medusa arises: by direct 
ht ster 4 
moos 
