THE SKim'LAKID.i:. 67 



Trophoaome. Colony attaining a height of lu to IL' Inches, usually much less, main .stein 

 with very distinct but irregular nodes below, -lighth llexuo-e. bearing usually a pair of subal- 

 ternate hydrotheca' on cadi of the upper internodes. Blanche- irregularly alternate, simple, or 

 dichotomously branched, forming a rather dense tut't on distal part of colony. Branches and 

 branchlets divided into long and irregular internodes each of which hears several pair- of siihop- 

 posite to aubalternate hydrothecffi. Ilydrothcca 1 of the usual thuiarian type, deeply immersed 

 in proximal parts of branches and less so in distal part.-, do.-ely approximated. Aperture cir- 

 cular to subtriangular, facing forward or outward, margin often with a single broad tooth on ii- 

 posterior side. Operculum of a single ahcauline flap. 



(rii/tiix/>//i, . - (lonangia home on upper side of hrandics. long, slender, with a round aper- 

 ture, narrow collar, and operculum. 



Distribution. Common on Briti.-h and Coiitinental shores of Noi'th Atlantic: New England 

 Coast (\'errill); "Atlantic coa-t " i-))cdnicn from the I'nited State.- National .Museum): Iceland 

 (Sasmundsson) ; (iulf of St. Lawrence C\\ 'hiteave-); '. Barents Sea I I)'l'rhaii): Polar Sea ( Bon- 

 nevie). 



In the ahsence of the gonosome this species i.- not alway- ca-y to distinguish from T. cnjtr< x- 

 xiini. The haliit of growth, however, is entirely ditl'ercnt from the graceful spiral arrange- 

 ment which characterizes the lattei-. Branches still'er and harsher. The gono-oine i- entireh 

 different. The species appeal's to lie rare on our Atlantic coast. 



The synonymy of this species is exceedingly uncertain on account of a mistake of I'allas 1 

 who gave the name S, r/iiliii'iii di'/ii-iil/ilii to an Atlantic species under the mistaken impression 

 that it was identical with the " Sea-Spleenwort " of Ellis. Afterwards Fleming (184i ; ) instituted 

 the genus Tlininrin, and. apparently misled by Pallas, called the Spleenwort of Ellis Tln/iti/'i'i 

 iii-ticiiliitii. In the meantime Ellis and Solander (1758) gave the name' S, rtnl<ir!<i A//7//V/.v to 

 Ellis's species of Sea-Splceiiwort, thus securing- the priority for the name linn-liit/x. which is 

 essentially a northern form. Since that time most writers have confused the two specie.- under 

 the common name TJniiiu-in firticvlata. Ilincks in his e-reat work (isii.s) seems to have done this. 

 In 1884 Kirchenpauer dearly explained the situation and reestablished the name /'. //// /V/ for 

 Ellis's species, in which he was followed hy Levinsen ( l.s'.i:-!). In most cases it is impossible to 

 tell which species is meant when the name /'. <irt'n-uln1ii is used, and we can only judge from the 

 distribution. 



THUIARIA PLUMULIFERA Allman. 

 (Plate IX. liiCH. il-lli.) 



Thuiaria plumuttfera AI.I.MAN. Mem. Mas. Coinp. Xoul., V, Nn. 2. 1S77, p. L'7. 

 T/iiiiiii-in /ili/miili/, rii KIKC HKM-ArKK. Norclisi-lic fiattniiiic'ii inul Artcn. Iss-l. p. L'.'I. 



Ti'iijtli/ifiiniii'. Colony attaining a height of lu inches in the largest specimen examined. 

 Main stem exceedingly long and slender, divided into internodes of unequal length, bearing 

 rather distant and opposite branches each of which bears an axillary hydrotheca; an additional 

 hydrotheca being between each two branches on each side. Branches rather distant, alternate, 

 divided into long ami very unequal internodes. and contracted at their origins. HydrothectB 

 alternate, well separated, tubular, not extensively immersed for this genus: aperture with two 

 broad, rounded teeth and a tubular collapsible extension of the hydrothecal walls. This tube i- 

 not constant, and in some hydrotheca' where it is wanting a two-valved operculum is seen. 



UmioxniiK . Not known. 



l>'ixii-'tliri<m.--()'S.(.\\\w Fear. 7 fathoms (Allman): Mlit,;>xx Station I'oi;,. hit. N. :',7 31', 



long. W. 74 :>:-,' :;u", in fath a; Station L"_'t;ii. ha. N. lu i:;' L5", long. \Y. c,:i L ".r i;,". 41; 



fathoms; Station L^f,:,. lat. N. : ::7 07' 40", long. W. 74 35' 40", 70 fathoms; Station .'7'.i. hit. 

 N. 85" I'd' 55", long. \\'. 75 -_'u' 55", Hi fathom-: Station i':'.u7. lat. N. :-!5 4i*'. long. W. 74 54' 

 ::u", 57.3 fathoms; Station !i:'.(ts, lat. N. :'.5 4::'. long. \\' . 74 53' 30", 15 fathoms: Station i'4-.M. 

 lat. N. :.17 07', long. W. 74 :U' 30", f,| fathoms. 



T>/ji<. In the Museum of Comparative /oology, Cambridge. Ma.-sachusetts. 



1 Elenchua Zoophytorum, 1'iM, p. i:;7l. 



