GUIDE TO THE CORAL GALLERY. 
Case 3. 
Case 3a. 
Case 3a. 
4b 
Obelia longissima * {Obelia sp., Fig. 11) forms very slender 
branching - stems ; the cups are borne on ringed pedicels, and 
resemble wineglasses. The generative polyps, which are borne on a 
blastostyle, become free Medusae.* The latter are tiny crystal bells 
with numerous tentacles and with eight litho-cysts ; they often swim 
with the umbrella everted and the manubrium projecting from the 
centre of the convexity. 
Sertularia abietina, the Sea Fir Zoophyte (Fig. 12, and specimen 
in Case 3a), forms clusters of brown pinna telv-branched stems from six 
to twelve inches in height. It is often seen among heaps of seaweed 
on the shore, or attached to oyster and scallop shells in fishmongers’ 
shops ; the rather large horny cups, which are arranged alternately on 
Fig. 7. 
E. 
A. B C. 
Diagrams illustrating the gradual degeneration of the Medusa bud into 
a mere rounded swelling. The black represents the stomach and its 
continuations ; the lighter shading represents the reproductive cells. 
a. Attached Medusa ; b. The same with margin of umbrella closed 
over manubrium ; o, d, e, further stages. (After Lankester, Encyc. 
Britannica.) 
each side of the branches, are swollen at the base and narrowed at the 
circular orifice. The oval reproductive capsules are slightly stalked. 
• Sertularia argentea* or the Squirrel’s Tail Zoophyte, S. cupressina, 
the Sea Cypress, and Thuiaria thuja , the Bottle Brush Coralline, are 
all expressively named by Ellis from their general appearance. In 
these species the sessile cups are arranged alternately on opposite 
sides of the branches. In Hydrallmania falcata, the Sickle Coralline, 
the cups are on one side only. In the five species above referred 
to the generative polyps (or degenerate Medusae) are permanently 
attached to a degenerate feeding polyp or blastostyle, the whole 
being enclosed in a horny capsule. 
Antennularia antennina , the “ Lobster’s Horn Coralline, or Sea 
Beard”* (Fig. 13, and specimen in Case 3b), forms long jointed 
Case 3b. 
