356 BULLETIN OF THE BUREAU OF FISHERIES. 



suggests that the bilateralism and higher coloration in the latter is due to exposure at the surface while 

 it is floating, and that this might account for its rapid development as well. 



Whatever bearing that may have on the Woods Hole Pcnnaria, it does not seem to apply to the 

 Beaid'ort forms. At Woods Hole the eelgrass variety had become common early in August. The 

 Beaufort specimens were examined a month later, and therefore, as far as time is concerned, should 

 agree with the later eelgrass variety. Growing side by side on the crab float, and therefore alwaj^s at 

 the surface, were found colonies as close as it is possible for colonies to grow — the one with the hydranths 

 and medusa markings pink or vermilion and the other grayish or milk)' white. Both exhibited marked 

 bilateralism and both appeared to retain the medusae at least until the sex products were mature. In 

 the specimens obtained from the piles of the railroad bridge under nearly the same conditions, the two 

 varieties were found similarly. As far as I can make out, there are no structural differences. I had no 

 time to make any investigations, and consequently have no explanation or even suggestion to account 

 for the differences, but I can not see that Hargitt's suggestion will in any way apply to the Beaufort 

 specimens, except that regarding bilateralism, which, I think, may hold good. 



Suborder CALYPTOBLASTEA. 



Hydranths protected by hydrothecae and gonophores by gonangia. 



Family CAMPANULARIDyE. 



Trophosome. — Hydrothecse campanulate, never sessile, never adnate to or immersed in the stem or 

 branches; no operculum; diaphragm always present; hydranth with trumpet-shaped proboscis. 



Gonosome. — Gonophores producing sporosacs or free medusae. These medusae usually have oto- 

 cysts and have the ovaries along the course of the radial canals. 



Key to the Genera of the Campanularid.^; Found in the Beaufort Region. 



A. Gonophores do not produce free medusae. 



a. Reproduction by sporosacs which remain in the gonangium; these give rise to planulae. 



Campanularia. 



b. Reproduction by sporosacs which are extruded into a sac at the summit of the gonangium, in 



which sac the planulae are produced Gotiolkyxra- 



B. Gonophores produce free medusae. 



a. Medusae, with 4 tentacles at time of liberation Clytia. 



b. Medusae, with 16 or more tentacles at liberation Obelia. 



There are few distinguishing differences in the trophosomes of these genera. 



Genus CAMPANULARU. 



Trophosome. — As in the family. 



Gonosome. — Gonophores producing sporosacs from which planulae develop within the gonangia. 



Key to Species of Campanularia Found in the Beaufort Region. 



A. Hydrotheca, with entire margin C. integra. 



B. Hydrotheca, w'ith margin toothed C. raridentata. 



Campanularia integra MacGillivray. 



Campmtularia mtcgra MacGillivray, Ann. and Mag. Nat. Hist., 2d ser., 9, 1842, p. 465. Hincfcs.Br. Hydroid Zoophytes, 

 1868, p. 163. Fraser, West Coast Hydroids, 1911. p. 31. 



Trophosome. — Colony usually unbranched, arising from a stoloniferous network; pedicels long and 

 slender, varying much in the amount of annulation, some being almost smooth and some being annu- 

 lated throughout. There are always two or three annulations below the hydrotheca. Hydrotheca 

 with entire margin tapering very gradually from rim to base. 



