370 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
b'. Marginal tentacles, 16 or more. 
c. Proboscis very long, reaching far below velum Timaformosa 
c'. Proboscis short. 
d. Tentacles with lateral cirri at bases Hebella calcarata. 
d'. Tentacles without lateral cirri. 
e. Bell disk-shaped. Proboscis without fimbriated tentacles. 
/. Otoeysts on bases of tentacles. 
g'. Tentacles 24 at liberation of medusa Obelia geniculata. 
Obelia longissima. 
Obelia flabellata? 
g. Tentacles 16 at liberation of medusa Obelia gelatinosa. 
Obelia dichotoma. 
Obelia commissuralis. 
e’. Bell deeper, its surface evenly rounded. 
/. Otoeysts between bases of tentacles. 
g. Otoeysts 8 (or more?). Mouth tentacles not fimbriated Clgtia bicophora. 
</. Otoeysts 8. Mouth tentacles fimbriated Tiaropsis diademata. 
g". Otoeysts numerous, with sense-bulbs at their bases Epcntheses folleata. 
g"‘. Otoeysts numerous. Tentacles with sense-bulbs and thickened “knee- 
pads” Gonionemus vertens. 
c". Bell with a distinct dome-like apical projection Oceania singularis. 
a’. Radial canals 8. 
b. Bell very deep, shaped like a bishop's miter . . Trachynema digitalis. 
b’. Bell subspherieal, somewhat narrowed above. Mouth with fringed tentacles Melicertum campamda. 
a". Radial canals more than 8. 
b. Manubrium very short, hardly distinguishable • Rhegmalodes tenuis. 
b'. Manubrium well developed. 
c. Mouth without fimbriated tentacles. Bell shallow JEquorca albida. 
c‘. Mouth with fimbriated tentacles Zygodactyla grcenlandica. 
Euphysa virgulata A. Ag. 
(North American Acaleph*,p. 189.) 
Bell quadrangular, thick, longer than broad. Proboscis short, tubular, without mouth tentacles. 
Tentacles 4, of which one is much longer than the others and has a triangular base. Radial canals 4. 
Velum with a sinuous inner edge. 
Coloration. — Tentacles with white bases and a pink stripe or band. Proboscis light yellow. 
I have not seen this species, and the above description is condensed from that of Dr. Agassiz. 
Hybocodon prolifer L. Ag. Fig. 76. 
(Cont. Nat. Hist. U. S., vol. iv, p. 243.) 
Bell ovate, evenly rounded, unsyminetrical owing to great development of the single tentacle; 
its surface marked with 5 meridional orange-colored bands, 2 of which start from the sides of the 
base of the tentacle. Proboscis long, contractile, sometimes reaching nearly to the velum; no month 
tentacles. A single very large marginal tentacle armed with conspicuous nematocyst batteries and 
bearing medusae of a second generation at its base. 
Color. — Superficial bands and base of tentacle orange fed. 
Distribution. — Taken in the tow at Woods Hole (Vinal Edwards. ) The colored bands are not 
easily seen in these specimens, which were collected in April. 
This species can at once be recognized by its single greatly developed tentacle with secondary 
medusae at its base. 
Corymorpha pendula L. Ag. 
(Cont. Nat. Hist. U. S., p. 276. The medusa is described by A. Agassiz in North American Acalephse, p. 192.) 
Bell deep, with the apex somewhat pointed, slightly unsyminetrical owing to the excessive 
development of one tentacle. Proboscis long, often reaching below the velum. Tentacles 4, one being 
much the largest, but not bearing secondary medusae at its base. 
Color. — Proboscis light yellow; bases of tentacles light pink. (A. Agassiz.) 
Distribution. — I find no record of this medusa having been found in the Woods Plole region, 
although the hydroid form from which it grows has been found there. Alexander Agassiz reports it 
from off Cape Cod. 
