[169] THE HYDROIDS 187 



pedicels arising above the proximal row of tentacles. Gonophores (fe- 

 male) with three to five long tentacular processes which are sometimes 

 half the length of the gonophore. The actinule at birth is without a 

 distal row of tentacles, and the gonophore has no indication of radial 

 canals. 



Distribution. — Orca, Prince William Sound, Alaska (W. E. Ritter). 



Exclusive of this species there have now been described four species 

 of Tubularia from the Pacific Coast of North America ; Paryfha 

 microcephala (A. Agassiz),^ which differs from the present species in 

 having flattened, instead of round, tentacular processes to the gono- 

 phores ; Tubularia elegans Clark,* which has mere tubercles instead 

 of the filiform processes to the gonophores ; Tubularia borealis 

 Clark,' which differs in having laterally compressed processes to the 

 gonophores ; and Tubularia larynx Ellis and Solander * (reported by 

 Gary S. Calkins), which differs from T. harrimani in the number of 

 both proximal and distal sets of tentacles, as well as in several other 

 characters. 



The species seems to be abundant at Orca, as numerous specimens 

 were found. 



CAL TPTER OB LAS TEA. 



Hydroida in which hydrothecae are developed for the protection of 

 the hydranths and gonangia for the protection of the gonophores. 



Family CAMPANULARID^^. 



Trophosome. — Hydrothecae well developed, non-operculate, never 

 adnate nor immersed in the stem and always with a septum partially 

 dividing the hydrothecal cavity from the stem cavity. Hydranths 

 usually with conical proboscis and a single whorl of filiform tentacles. 



Gonosome. — Gonophores producing planulae or free medusae. 



It would be hard to find two authorities who would agree as to the 

 genera of this exceedingly perplexing family. The arrangement here 

 adopted is substantially the same as that used by the writer in another 

 work now in press." It is not offered as a final solution of the diffi- 

 culty, but as a convenience in discussing the group in the present 

 connection. 



' North American Acalephs, p. 195. 

 ^Transactions Conn. Acad. Sci., Vol. in, p. 253, 1876. 

 3Proc. Acad. Nat. Sci. Philadelphia, p. 231, 1876. 

 <Proc. Boston Soc. Nat. Hist., Vol. xxviii. No. 13, p. 335. 

 * Handbook of the Hydroids of the Woods Hole Region. To be published by 

 the U. S. Fish Commission. 



