No. 415.] NORTH-AMERICAN INVERTEBRATES. 579 
from the base of which lines of nematocysts extend over the bell to the apex ; 
tentacular bulbs of purplish orange color and each with an ocellus; manu- 
brium rather large and spindle-shaped, of yellowish color. 
Hydricthys mirus Fewkes. 
Bell oval or subspherical, its outer surface dotted with nematocysts ; radial 
canals four, wide; marginal tentacles four in mature specimens, only two 
bulbs reddish in color but without 
ocelli. The original description was 
from specimens taken from a colony 
attached to a fish taken at Newport; 
other than this I find no records of it. 
(Cf. Bull. Mus. Comp. Zoól, Vol. 
XIII, p. 224 
Pennaria tiarella McCr. (Fio. 36). 
Bell oblong oval, of small size, 
about two mm. in height and half as 
broad ; radial canals four, narrow, but rather conspicuously marked by línes 
of pinkish pigment; marginal tentacles very rudimentary from the four 
tentacular bulbs, which are devoid of ocelli ; gonads borne on the walls of 
the manubrium, and as they approach maturity filling the entire cavity of 
the bell. The eggs and sperms are discharged promptly upon the medusa 
becoming free and even before; indeed, in many cases the medusz are 
never liberated, as I have elsewhere shown. Color 
of a general reddish pink or rosy, manubrium a 
chocolate brown ; ova vary in color from pale creamy 
white to rather bright orange. 
Specimens of P. gibbosa from Florida and Porto 
Rico seem to me to be scarcely vU ERE from 
p^ 
) 
lla McCr. 
P. tiarella. Hydroid, — Pennar 
Perigonimus jonesii Osborn and Hargitt 
(Fic. 37). 
(American Naturalist, 1894, p. 27-) 
r hemispherical, with slight conical apical pro- 
‘ jection; marginal tentacles two, with four marginal 
dan P chy ce. iie: Ade highly retractile and often with- 
Mises rawn and coiled within the bell cavity when the 
medusa is irritated. Though these medusz were kept under observation 
for several weeks, no gonads were developed. 
