416 TUBULARIA CROCEA. 



*^* Ik TuBULARIA PACIFIOA, Alhucm. 



Under the name oiThamnocnidia tiihularoides,?i species of Tuhiilaria is also recorded by Mr. 

 A. Agassiz, but without sufficient detail for a technical diagnosis. The following paragraph 

 contains all he says of it : 



" This species grows in clusters, which, at first sight, would readily be mistaken for a species 

 of true Tubiilaria, on account of the great diameter of the stem and the large size of the head. 

 The structure of the proboscis, however, shows plainly that it is a genuine Thamnocnidia, which 

 can at once be distinguished from its Eastern congeners by the stoutness of the stem and size of 

 the head, surrounded by as many as thirty and even forty tentacles, in large specimens. Found 

 growing profusely on the bottom of the coal barges which bring coal from Benicia to the Pacific 

 Mail Steamship Company's steamers at San Francisco." (A. Agassiz's ' lUustr. Catal. N. A. 

 Acselephse,' p. 196.) 



For reasons already mentioned I regard Thamnocnidia as identical with Tuhularia ; and as 

 the specific name of tubularoides can scarcely be retained with the generic name of Tuhularia, I 

 have here ventured to substitute for it that ol pacifica. 



The species possesses an interest as being a Pacific representative of the Atlantic forms of 

 Tuhularia. In the description just quoted from Mr. A. Agassiz allusion is made to "the strac- 

 ture of the proboscis, as proving the species to be " a genuine Thamnocnidia!' I do not know to 

 what peculiarity this statement refers. In the hydranths of such European species as Prof. 

 Agassiz would refer to his genus Thamnocnidia, there are certainly no characters which would 

 justify a separation from Tuhularia. 



^^^^^ Sub-genus Parypha, Agassiz. 



Sporosacs without evident gastro-vascular canals ; apical processes in female sporosac 

 laterally compressed. 



*^* 15. TuBULAMA CKOCEA, AgassK. 



P.iRYPH,\ CROCEA, — A(jassiz, in Contr. Nat. Hist. U. S., vol. iv, p. 249, pi. xxiii. A. Ayassiz, 

 in Uiustr. Catal. N. A. Acal., p. 195. 



TEOPHOSOME. — Hydrocaulus consisting of bunches of stems, which are " at 

 the base very much contorted, irregularly branched, and densely intertwined," each 

 stem ascending singly from this entangled mass to a height of from two and a half to 

 three and a half inches ; pebisajrc " wavy or slightly nodose, or faintly ringed at 

 irregular distances." Htdrantus with each tentacular circlet consisting of about 

 twenty-four tentacles, disposed in a single verticil. 



