NO. 4 FRASER : HYDROIDS 5 



Gonosome. — Not observed. 



Distribution. — Station A22-39. Off Tortuga Island, 2-5 fathoms. 



Remarks. — C. certidens bears much resemblance to C. macroscypha 

 Allman, more than to any other American species, although it is much of 

 a miniature as compared with that species. In C. macroscypha the whole 

 zooid may be 7 times as long, and the hydrotheca 4 times as long, and 

 more than twice as broad as in this species, and yet the hydrotheca is much 

 the same shape and the teeth on the margin are very similar, although 

 there are but 10 here as compared with 12-14 in C. macroscypha; the 

 spherical section of the pedicel at the base of the hydrotheca is similar. 

 In C. macroscypha there are a few much scattered annulations on the 

 pedicel, while in C. certidens there is none, although the surface is wavy. 

 In neither has the gonosome been observed, so the closeness of the relation- 

 ship cannot be pressed further. C. macroscypha is a common species in 

 the West Indian region. 



Campanularia marginata (Allman) 



Obelia marginata Allman, Gulf Stream Hyd., 1877, p. 9. 

 Campanularia marginata Fraser, Atlantic Hyd., 1944, p. 124. 



Distribution. — 8 miles southwest of San Nicolaas Bay, Aruba Island, 

 23-24 fathoms. 



This location is but a short distance from Testigos Island and Trini- 

 dad. The species is common throughout the whole Caribbean Sea area 

 and the West Indies, as well as farther north along the coast of the 

 United States. 



Campanularia megalocarpa, new species 

 Plate 1, Fig. 2 



Trophosome. — The colony, 3 cm, has a stem that is fascicled but not 

 strongly, in the proximal portion, and but rarely in the proximal portion 

 of the branches. The simple portion of the stem and branches is some- 

 what flexuous, with the pedicel of the hydrotheca, or a branch, arising 

 from each bend in definite alternation. The stem or branch has 2 or 3 

 annulations above the origin of each pedicel. The hydrotheca is borne 

 on a relatively short pedicel which is annulated throughout; it is 

 elongated campanulate with straight sides and little or no flare 

 (0.5 X 0.25 mm) ; the margin is entire. 



Gonosome. — The gonangium takes the place of a hydrotheca, with a 

 similar pedicel; it is very large, 1.5 x 0.4 mm, the longitudinal section, 

 cuneate, with the margin forming the broad base of the wedge; the cJr- 



