No. 415.] MORTH-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, with 
oral lobes sinucusly convoluted; color of bell light ochre, 
tentacles and gonads much darker. Re- 
ported from Greenland, Grand Manan, a 
Nahant, etc., A. Ag. Newport Harbor, ; ABI 
: = 
May Mayer. Hydroid (?). My TW m . 
oe 
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- 
Fic 50.— Lafea calcarata A, Ag. 
5 a, a young medusa of same. 
ous and filamentous; gonads variously (After A. Agassiz.) 
folded and disposed beneath radial canals; devoid of either ocelli or otocysts. 
According to A. Agassiz (p. 137, V. A. Acalephe), from whose account both 
this and the preceding description are condensed, this medusa. lives chiefly 
at considerable depths, and exposure to light or increased temperature 
rapidly disintegrates it. Hydroid (?). 
Eutima mira McCr. (Fic. 51). 
Medusa broadly bell-shaped, tending to conical; marginal tentacles four, 
long and tapering from an enlarged base; numerous minute tentacular 
processes distributed 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 
: manubrium and tentacles shorter, the latter without the 
Fic. 51.— Eutima 3 : 
mira McCr. basal swellings of the former and the oral margin less 
(After McCrady-) filled; broad diameter one to two inches, height much 
less; otocysts large and with numerous lithocysts. Hydroid (?). 
