12 LAFOEA CONVALLARIA. 
tervals from the creeping filament, cylindrical, deep, slightly curved in one 
aspect, regularly annulated; orifice circular with everted lip. 
Gonosome not known. 
Dredged along with Obelia marginata at Logger-Head Key from a depth of 9 fathoms. 
This elegant little campanularian was found creeping over the branches 
of Obelia marginata. 
Lafoéa tenellula. 
Pl. VII. Figs. 3, 4. 
Trophosome. — Hydrothece very minute, slightly curved, contracted below 
into a short thick peduncle, springing at intervals from a creeping tubular 
filament. 
Gonosome not known. 
Dredged south of Marquesas from a depth of 140 fathoms. 
This is a very minute species. The form of the hydrothecs resembles 
that of the hydrothece of Z. dumosa, but the whole hydroid is more minute 
and delicate. The hydrothece are usually marked by rings of elongation 
behind the orifice. 
Lafoéa convallaria. 
IA IDS 
Trophosome.— Stem attaining a height of about an inch, simple, fascicled 
below, sending off simple, non-fascicled, alternate pinne. Hydrothecz 
stalked, alternately disposed along the main stem and pinne, tumid towards 
the base and contracted towards the orifice, which is turned towards one side. 
Gonosome not known. 
Dredged from a depth of 152 fathoms off the Florida Reef. 
Lafoéa convallaria is a beautiful little hydroid. Its cornucopia-like hydro- 
thece on their short stalks, with their regular symmetrical disposition along 
the main stem and pinne, give to the entire hydrophyton a remarkable and 
very elegant aspect. 
The form of the hydrotheca appears to change somewhat by age, for 
while in some the distal end is turned only slightly to one side, in others 
it possesses in common with the operculate genus Cuspidella. The cavity of the hydrotheca thus passes 
uninterruptedly into that of the supporting peduncle, or if the hydrotheca be sessile, into the cavity 
of the stem or branch which carries it. Admitting the correctness of this view, it appears to me 
very doubtful whether many of the species referred to Lafoéa are rightly so placed. 
