No.415.] .VORTH-AMERICAN INVERTEBRATES. 587 
Melicertum campanula Esch. 
Medusa bell-shaped or subconical; marginal tentacles very numerous, 
long, and filamentous, but devoid of basal cirri; radial canals eight at 
maturity, four in young specimens; gonads suspended in sinuous folds 
beneath radial canals; manubrium much as in preceding, wit 
oral lobes sinuously convoluted; color of bell light ochre, 
tentacles and gonads much darker. 
May Mayer. Hydroid (?). 
Ptychogena lactea A. Ag. 
Bell the small segment of a sphere, 
walls rather thick; radial canals four, 
but with sides variously notched and in 
the medial portions increasing to extended 
lateral diverticula; tentacles very numer- ides x ena. nahme iui 
ous and flanipiions gonads variously (After A. Agassiz.) 
folded and disposed redeat radial canals; devoid of either ocelli or otocysts. 
According to A. Agassiz (p. 137, W. A. Acalepha), from whose account both 
` this and the preceding description are condensed, this medusa lives chiefly 
at considerable depths, and exposure to --— or increased temperature 
rapidly disintegrates it. DA (?). 
Eutitia ane McCr, (Fic. 51). 
Medusa broadly pu. om tending.to conical; marginal tentacles four, 
long and tapering from an enlarged base; numerous minute tentacular 
rocesses | diftribuled about the margin ; otocysts eight, 
symmetrically disposed; manubrium very long, extend- 
ing far beyond the velum, and terminating in an everted, 
somewhat frilled margin; gonads disposed beneath radial 
canals. Hydroid (?). 
 Eutima limpida A. Ag. 
Medusa much as in preceding species, but with both 
Fic. s1.— Enzima ™anubrium and tentacles shorter, the latter without the 
mira McCr. basal swellings of the former and the oral margin less 
Ae Mere) frilled; broad diameter one to two inches, height much 
less ; otocysts pe and with numerous lithocysts. suci. q) 
