HYDROIDS OF THE WOODS HOLE REGION. 
379 
Eucheilota ventricularis McCr. 
(Proe. Elliott Soc., vol. I, No. 1, p. 187.) 
Bell hemispherical. Tentacles 16 to 20, with sense-bulbs at bases, highly contractile. Otocysts 8, 
with retractile granules arranged in an arc. Proboscis short, tubular, not reaching to bell opening. 
Radial canals 4, wide. Ovaries occupying whole length of radial tubes. Velum wide. 
Colors. — Proboscis yellow, with a red central portion. Ovaries yellow, sense-bulbs with a red 
center. 
Distribution. — Naushon; Buzzards Bay (A. Ag. ). 
This description is condensed from that of McCrady. Dr. Agassiz appears to doubt whether 
his species is the same as that of McCrady, and describes it as having lateral cirri to the tentacles. I 
have not seen this species. 
Clytia noliformis (McCr. ). 
( Campanula.!' ia iioliformis McCr., Proc. Elliott Soc., vol. i, No. 1, p. 194.) 
Bell hemispherical. Marginal tentacles 4 in young and more numerous in adults. Otocysts 8, 
two between each two radial canals; always between tentacle bases, and not on them. No eye-spots. 
Proboscis very short, ending in a four-lobed mouth. Radial canals 4. 
Colors. — There are no conspicuous colors. Ovaries yellowish-white. 
Distribution. — Buzzards Bay and Naushon (A. Agassiz, under name of Platypyxis cylindrical) . 
Clytia bicophora Ag. 
(Cont. Nat. Hist. U. S., vol. iv, p. 304.) 
Bell hemispherical, considerably flattened in older specimens. Tentacles 4 to 16, according to 
age. Otocysts 8 or 16, according to age, placed between tentacular bases. Proboscis short, ending in a 
4-lobed mouth. Ovaries, in adult, reaching along radial canals nearly to proboscis. Radial canals 4. 
Colors. — Ovaries brown. Black spots on swollen liases of tentacles. 
Distribution. — Naushon; Vineyard Sound (A. Ag.). 
I have not seen this species, and the above description is condensed from that given by Dr. A. 
Agassiz, North American Acalephte, p. 78. 
Tima formosa Ag. Fig. 96. 
(Cont. Nat. Hist. U. S„ vol. IV, p. 362.) 
Bell broadly campanulate, the edges perceptibly 
flaring, the lateral outline sinuous. Marginal tentacles 
32, some of which are often rudimentary, with swollen 
sense-bulbs at their bases. Otocysts numerous, placed 
between the bases of the tentacles, each with a few gran- 
ules near its margin. Proboscis very long, in the shape 
of a very attenuate cone with its base upward, and 
extending far beyond the bell opening when expanded. 
Mouth surrounded by four conspicuous frilled lappets. 
Ovaries strongly convoluted and extending the full 
length of radial canals and proboscis. Radial canals 4. 
Size very large. Among the largest of our hydroid 
medusae. 
Colors. — Ovaries and sense-bulbs whitish ; sometimes 
light-yellowish. 
Distribution. — Woods Hole (F. M. Walmsley); Vineyard Sound (Verrill). 
Obelia longissima (Pallas). 
( Sertularia longissima Pallas, Elenehus Zoophytorum, p. 119.) 
It is exceedingly difficult, if not impossible, to differentiate the medusae of the various species of 
this genus. In some cases the only way to identify them is to see them given off from the hydroid 
