124 



MARINE INVERTEBRATES 



four inches long. It is bright red in color, and from the center of the 

 circle of tentacles the reproductive zooids hang in a cluster, like a bunch 

 of grapes. It does not liberate swimming-bells. It is found in bunches 



on piles of wharves and bridges, in brack- 

 ish water, on the eastern coast as far 

 south as Charleston, South Carolina. 



Corymorpha pendttla. See Plate 

 XLII. 



GENUS Hybocodon 



H. prolifer. One of the largest 

 tubularians, somewhat resembling Pa- 

 ryplia crocea. It is deep orange in color, 

 and the head is erect on a long 

 stem. The reproductive zooids are in 

 a cluster in the center of a double row 

 of tentacles, and resemble a basket of 

 fruit. It grows singly, or in groups of 

 two or three, in shaded tide-pools, which 

 are protected from the surf, and in which 

 the water is very pure. It is found on 

 the Massachusetts coast, but is not 

 common. This species liberates swim- 

 ming-bells. (Plate XLI.) 



GENUS Pennaria 



P. tiarella. The branches are ar- 

 ranged alternately and at right angles 

 to a central stem or axis; they taper, 

 being shortest at the top and bottom of 

 the stem. The zooids are red in color, 

 and are arranged along the upper side 



of branches at considerable intervals. The stems are black and beaded, 

 being constricted at intervals. The zooids have two rows of tentacles, 

 the upper ones on a small proboscis. From the lower part of the pro- 

 boscis deep, bell-shaped bodies, which eventually become swimming- 

 bells, are developed. The species is found on rocks and eel-grass along 

 the whole eastern coast. 



P. gibbosa. A species similar to P. tiarella, found on the coast of 

 Florida. 



GENUS Boiigainvillea 



B. 8upercttiai*is. This hydroid is found in tide-pools on the New 

 England coast, growing in clusters, about two inches high, attached to 

 rocks or to mussel-shells. The stem is very slender, and branches. It is 

 red in color. The medusas which it liberates are found in great numbers 

 in the spring. The tiny swimming-bells are nearly globular. The tenta- 

 cles are long, are arranged in four clusters on the margin, and extend in 

 every direction. The manubrium is yellow and short, and the mouth is 

 concealed by four clusters of short tentacles. On these oral tentacles 



Pennaria tiarella ; a branch, natural 



