3G4 



Hl'LI.KTIN OF TI1K TXITKD STATES FISH COMMISSION. 



Thuiaria cupressina (Linn.;. Kig. till. 



(St : ftii/"<>" ''!;/<' *>///<( Linn., Syst. Nat., p. 130H.) 



Trojilinxomi'. Colony consisting nsiuilly of a single very long and graceful central stem which 

 gives off alternate branches which again divide diehotomously into long alternate branchea; giving the 

 appearance of a verticil late arrangement. Inter-nodes much shorter than in the last species, each bear- 

 ing several pairs of suboppositc hydrotheca-. Hydrothec;e immersed nearly to their ends, tubular, 

 rather straight, with a not very pronounced bilabiate aperture. 



tiiniiiMiuii: ( ionaiiiria borne ill rows on upper sides of pinnules, shaped like those of T. argi-iilen. 



Dixti-ihiitinii. Vineyard Sound (Verrill). A specimen in the I'. S. Fish Commission cullection 

 at Woods Hole is labeled, "K. by S. Sankety Light, L'5 fath." 



ThutarlaCHpre&tna(l,lim.). A. GonaiiKia. fi7. Thuiariu thuja (Linn.), 



Thuiaria thuja (Linn.). Fig. 67. 



(Xrrtnltiriu thuja I. inn., Syst. Nat., p. 1308.) 



TrophoHonie. Stem rigid, sharply and finally geniculate, without branches on lower portion; 

 branches forming spirals, each diehotomously branched and forming a flabellate structure. All of the 

 branches and branchlets are stiff and harsh, very different from the graceful structures of the preceding 

 species; internodes very thick, each bearing several pairs of closely approximated subopposite 

 hydrotheca?, the top of one often reaching to bottom of one immediately above. Hydrothecse tubular 

 somewhat swollen below, apertures with two rather inconspicuous opposite teeth of about the same sine. 



G/onOBome. Gonangia ovate, without lateral spines, and with a short collar and round aperture. 



Distribution. Off Xantucket. (Vinal Edwards). 



IIYDKALLMANIA. 



imr. Stem branched, the branches plume-like. Hydro- 

 thecse in groups on one side of terminal branches, arranged in an alter- 

 nate manner, curving to right and le:t. 



Gonosonie. Gonangia ovate, with a terminal aperture surrounded 

 by a slight collar. 



Hydrallmania faleata (Linn.). Fig. 68. 



(HiTtiiliii-iilJ'nlriilii Linn.. Syst. Nat., p. 1309.) 



Tropliosomi'. Stem slender, without hydrothecse; branches plume- 

 like, the branchlets divided into internodes, each of which bears a group 

 of several hydrothecse on its front or upper side. Hydrothecfc fla.sk- 

 shaped, swollen below, narrow above, curved distally and ending in a 

 bidentate aperture with an operculum. 



Gonosonte. (ionania as described above. 



Disti-iliiitivii. C'omni'.in in rather deep water throughout the Woo<ls 

 Hole region. 





 68. ITu'lraltmninn falcata (Linn.). 



A p lirt jon of brand), side view. 

 B. Gnnangium. 



