THE SEKTULAKID.K. l'i. r ) 



long and irregular, sometimes bearing two hydrotheca- and ;i lr:meli on one side and a single 

 hydrotheca on the other. Main branches like the stem, bearing alternate hruiichlet.- that often 

 divide dicb.otomou.8ly, divided into long and irregular internodes each bearing t\vo lateral i-o\vs 

 of hydro! heca'. 



Hydrothec;e Sllbopposite, tulmlar. expanded below. narrowing above into a verv sh<>i-t neek 

 ending in 'a circular aperture which faces upward and slightly toward the branch. Operculum 

 of one adcaulinc valve. 



GOIIOKIUII,: (ionangia borne on upper sides of branchlets. ovate, flattened, expanded laterally 

 and dista'ly into two tlat spines set on the shoulder. Aperture terminal, round, borne on a short 

 neck resembling the frustum of a cone. 



J)!x/>-!Initiuii. Bering Sea. west of N'univak Island, _!4 fathom^: ( 'hignik Bay. Alaska (( 'lark;; 

 Puget Sound (C'alkins); Yakutat. Alaska (Nutting). Lat. X. r,:.' I."/, long. W. 1C7 JV, Lieut. 



George X. StolieV. I*. S. Xaw. 



This is a very well-marked species of a typical thuiarian character, except in its opeivulum. 

 The opereula are well shown in some of the specimens collected bv I>r. \\ . II. Dull. 

 Ti/2>f. In the collection of the V . S. National Museum. 



THUIARIA POLYCARPA Kirchenpauer. 



( Tlatr VIII, li^. 7-9. i 

 'I'liniirria puhji'di'pii I'cKri'ii; ( Manuscript i, KisCHENPAUKR, Nordische Gattungen ninl Arti-n, Iss4. p. 27. 



Trophosome. Colony (fragmentary) about 1 inch in height. Stem straight with verv uneven 

 internodes and two opposite rows of hydrotheca'. brunches irregularly alternate, rigid, divided 

 into long and uneven internodes. each bearing several pairs of hydrotheca'. Hydrotheca- in strict! v 

 opposite pairs, long, tubular, with distal ends bent outward, aperture round, facing directly out- 

 ward, the top of one hydrotheca not reaching the base of the next one above, the pairs being 

 slightly but definitely separated. 



(rimiiNittii, . - rnknown. 



LiK'iility. Valparaiso, Chile (Poeppig), 



The above description is from a specimen kindly sent me by Professor Levinsen. This 

 species differs from most of the genus Tlniiiiriit in having exactly opposite hydrotheca'. The 

 other characters are so strictly thuiarian, however, that there >ccms little doubt regarding the 

 propriety of including it in the genus. 



////'<. In the Leipsie .Museum. 



THUIARIA KURILiE ( Pceppig) . 



I I'hite IX, li;s. 1-1'.) 

 i,-nril;i \\v.\-v\t i Maniiscript ) V 



iHii' . Specimen about 'A inches high. Stem imbranched. divided into very long 

 and irreo'ular internodes and beurin r a row of hydrothecse on each side, there being three hydro- 



o a 



thec;e, one uxillurv and two others, between adjacent branches. Branches strictly alternate and 

 divided into long and irregular internodes by distant nodes. Hydrotheca- subopposite, tlask- 

 shajH'd. the distal end but little constricted. Aperture large, opening outward and a little 

 upward, margin with a very large tooth or lobe rising upward on the adcaiiline side and closely 

 appressed to the hydrocaulus. This tooth is apparently broken oil' in many eases. 



(ioimxiiiHi . Xot present in the specimen described. 



I. in-iil it i/. I'nalaska. 



The specimen above described was received from Prof. (i. M. R. Levinsen. I have not seen 

 the original description and am unable to cite it. Coming from so high an authority I have 

 felt justified in including it here. The very large lobe or tooth on the adcaulinc side of the 

 hydrotheca is a character that divides this species from all other American members of the 

 genus. 



