JELLYFISHES AND HYDROIDS 30 
forty tentacles. The veil-like lips around the mouth form long, 
graceful curtains often two and one-half feet in length. This me- 
dusa can be at once distinguished by its amber-pink coloration, and 
the sixteen spoke-like areas of reddish specks upon the convex side 
of the disk. There are eight sense organs, each contaiming a 
spherical mass of concretions. These are situated at regular inter- 
vals within notches at the disk-margin. 
The Milky Cross, (Stawrophora laciniata), is abundant along 
the Atlantic coast north of Cape Cod, during the summer months, 
and is occasionally seen along our coast in spring. The appear- 
ance of a milky-colored cross is produced by the large cruciform 
mouth bordered with veil-like frills containing the reproductive 
organs. It is from four to eight inches in diameter. There are 
numerous little eye spots at the base of the tentacles, upon the bell 
margin. 
The Thimble-Jelly, (Melicertum campanula). This little Arctic 
jellyfish resembles a large thimble of clear jelly-like substance 
with eight, yellow, radial canals extending from the stomach at the 
centre of the concave side of the thimble to the edges forming, so 
to speak, the spokes of a wheel. The edge of the bell is provided 
with numerous tentacles. It is exceedingly abundant until mid- 
summer, north of Cape Cod, but is 
found on our coast only in the spring. 
(Gonionemus murbachi, Fig. 11). : 
This interesting little jellyfish is famil- Bey STE 
iar to all who study at the Woods Holl cad 


Laboratory, for it is very abundant in ad & Z 
the Eel Pond at that place. The bell rx BA 
is transparent, somewhat flatter than a f 5 ane 
hemisphere, and when full grown it 
becomes about one inch in diameter. 
About eighty long, flexible tenta- 
cles arise from the side of the bell near “#8: 77" Jellyfish, Gonzonemus 
; murbachit, Woods Holl, Mass. 
the rim. Each of these bears a sucker- 
like disk upon its upper side near its extremity, and the extreme tip 
of the tentacle bends sharply at right angles. The tentacles are cov- 
ered with wart-like clusters of minute thread-cells each containing a 
coiled tube which can be turned inside out as we might do with the 
