vol.1.] Torrey.— Hydroida of the Pacific Coast. 51 



Fam. Ca.mpaxulariidak. 

 Tniphosome. Hydrothecae well developed, pedunculate, uon-operculate, 

 with septum at base. 



Gonosome. Gonophores free medusae or fixed. 



Campanularia. 



Trophosome. Colony regularly branching or unbranched, simple or poly- 

 siphonic ; hydrothecae campanulate. 



Gonosome. Gonophores fixed sporosacs. 



Campanularia denticulata Clark. 



PI. IV. Fig. 34. 

 C. dentioulata, ('lark, Proc. Ac. So. Phil., 1876, XXVIII, p. 213. 



Distribution. San Pedro Harbor, on float at ferry landing. 

 Port Etches, Al„ dredged 10-18 fathoms; clayey mud (Clark). 



The San Pedro colonies agree with Clark's description with 

 the one exception that they branch. The Alaska form lacks a 

 gonosome and is probably immature. 



The branches bearing hydrothecae are completely ringed, 

 with 5-15 rings. They arise in all planes. Above each axil the 

 main stem has 3-8 rings. Below and opposite the origin of the 

 hydrotheca there is a definite knee. The stem is straight 

 between knees; as a whole not flexuous. Hydranths with 22 

 tentacles. Hydrothecae .65 mm. x .36 mm. ; .75mm. x .47mm.; 

 1.00mm x .45 nun. Tallest stem 20mm. Gonosome absent. 



Campanularia everta Clark. 



PI. IV. Figs. 35, 36, 37. 

 C. everta, Clark, Trans. Conn. Ac, 1876, III, p. 253. 



Distribution. Catalina I., 42 fathoms; San Diego, 1-24 

 fathoms, fine sand; Pacific Grove, Cal. San Diego (Clark). 

 Crowing on seaweed. July, 1901. 



This is an exceedingly variable species. The rim of the 

 hydrothecae may or may not be .-verted; it is usually, but not 

 always crenate. The wall of the hydrotheca may be very thick 

 or very thin, and is either straight or convex in profile. The 

 stem may be long or short, smooth, wavy or irregularly jointed. 

 A constant feature is the presence of a spherical annula imme- 

 diately below the theca. The gonotheca is somewhat compressed, 



