586 THE AMERICAN NATURALIST. [VoL. XXXV. 
CANNOTID&, 
Radial canals four, each with lateral, sometimes pinnate, branches which 
end blindly. A single genus within the range of this synopsis so far as 
known to the writer’. 45-2 pale Gls oi ied Se Cee vena 
EUCOPID&. 
A. Marginal tentacles four, sometimes with lateral basal cirri. 
1. Manubrium very long, extending much beyond velum . Eutima 
2. Manubrium short, tentacles with basal cirri . . . . Eucheilota 
3. Manubrium short, tentacles devoid of basal cirri . . Clytia (Juv.) 
B. Marginal tentacles sixteen or more. 
1... Manubrium Jong, bell-hemispherical \). 9-73 Ye ) . 3 ; 0, ia 
2. Manubrium short, bell disk-like, otocysts on bases of tentacles 
Obelia 
3. Manubrium short, mouth plain, bell hemispherical, otocysts between 
bases ot tentacles<... 1% Hes aa. woo Mel ydia 
4. Manubrium short and with fenloriated ‘oral igbes uses sD tatOpsis 
(2) With 16 tentacles . . . ower, eo Ae Epenthesis 
5. Manubrium short and with oral jawes plain. 
(6) Wath more than’ 16) tentacles sen) ane Oceana 
ZEQUORID. 
A. Radial canals eight or more, often lobed or divided at their bases 
Halopsis 
&. Radial canals numerous, twelve to one hundred or more. 
1. Manubrium very short, often Peet be and with crenulated 
oralmargin . . ~ a « « Rheematodes 
2. Manubrium well Hovelevedt eal margin lobed but plain A®quorea 
3. Manubrium large and with complex and fimbriated oral lobes 
Zygodactyla 
Lafwa calcarata A. Ag. (FIG. 50). 
Bell broad, somewhat conical or dome-shaped, marginal tentacles numer- 
ous, somewhat swollen at base, long and filamentous, and interspersed with 
tentacular spurs, clubs, and cirri; gonads suspended in convoluted masses 
beneath radial canals, of milky or yellowish color; manubrium short and 
with convoluted oral lobes. When first liberated, the medusa is small and 
with only two tentacles, others appearing with growth; ocelli are located 
upon the bases of the tentacles. Size about 20 mm. in diameter. Hydroid, 
— lbid. 
