1889.] 071 a Fez.' Californian McduscB. 597 
.'ith the hydroid, seen in the apical projection, adds 
some weight. Even if it is an immature Medusa, the character of 
the tentacles, so like those of Dipurena, is exceptional. The speci- 
men cannot be confounclcd with Dipurena on account of the 
greater number of radial tubes. 
It may be urt;cd with some weight that we are dealing with an 
abnormal specimen, and that the extra tube is an abnormality. 
Granting that such is the case, the apical projection remains as a 
feature not possessed by any of the species of Dipurena, and 
ordinarily the apical projection is a late formation on the bell 
of a Medusa as shown in the development of Stomatoca and 
Dinematella. 
Microcampana is not the only unitentacular Medusa found in 
the prolific waters of our Pacific coast. A second genus, known 
from the Atlantic for many years, is also represented in the Santa 
Barbara Channel. 
A bizarre genus of HydromeduScTc, found on the Atlantic coast, 
is known as Hybocodon, the " hunchback " Medusa. The same, 
or a very similar, genus from Europe is called Steenstrupia. 
There genera are remarkable from the fact that they have but one 
long, flexible tentacle. One of the most interesting features of 
this Medusa is that the young arise as buds from near the attach- 
ment of this tentacle to the boll mar-in. It is a true Tubularian, 
with the peculiarities of that group, but has three of the tentacles 
so reduced as to be wholly wanting, wiiile the fourth is very 
much prolonged and is highly flexible, armed with ferules of 
powerful "stinging cells,"— nematocysts. The young, with 
the bells in process of formation, each with its own tentacle 
more or less completely developed, and clustered at the base of 
the long tentacle of the parent, can be seen in my figure. When 
sufficiently developed these budding individuals probably break 
their connection with the mother, and from the bases of their 
tentacles in turn they develop new broods. 
Among the many other HydronieduScTC which live in the 
Californian waters, one of the most beautiful is closely allied to 
Sarsia, a genus abundant at times in Massachusetts Bay. This 
beautiful animal has received the name Sarsia rosaria, and is the 
