THK riEETULAKID^K. 11M 



ABIETI N ARI A Kirchenpauer (modified |. 



Trophosome. Hydrothecse not strictly opposite, more or less bottle -shaped (the proximal 

 portion turbid, distal portion nan-owed), oprivulum of a single adcauline flap, niaryin usually 



without Irctli. 



IriiiioxiniK . Gonangia plain, corrugated or ribbed, without lateral spines and without an 

 internal inarsupium. 



This yenus \vas proposed by K irehen])uiter ' to include a few species allied to X, i-tulm-in 

 nhntiini of authors, his formal characterization beiny as follows, freely translated: 



Sertularians with branched stem. .Stem or liranch bearing pinnate branches. Ilvdrother;e 

 flask-shaped, decidedly bulyiny (ventricose), with a tubular neck, and aperture directed laterally. 



Neither Kirchenpauer nor Marktanner-Tnrneretscheiv who adopted this yenus. reeoyni/ed 

 the important character of an adcauline operculuni, the latter writer expressly stating that 

 Al>i<tiinii-it< is composed of nonopeivulate forms. Levinsen, on the other liand. placed yreat 

 stress on the operculum, as we have seen, and included all species with a single-flapped adcauline 

 operculuni in the ovnus liiji/mxlii." Here, ayain. it seems to me, that reliance on a single character 

 lias been misleading and has resulted in an unnatural association of species. 



The yen us as above defined appears to be a fairly natural yroup. and one easily identified in 

 nearly all cases. Of course the operculuni is sometimes difficult to make out by the novice, but 

 any yood observer should be able to detect it and to decide whether it is adcauline or abcauline. 

 thus differentiating between Aliiftimiriii and Ttuiiiiriii in cases where other characters fail. In 

 most cases the yeneral shape of the hydrotheca.' will at once determine the matter. 



ruINTS OF INTFKiiKAIiATIuX I'.KTW F.KX AJ',1 KTINAKI A A\l> nTIIF.R < i K.NKKA. 



With Thiiliii'iii, in general shape of hvdrotheca, extent of immersion of hydrotheca'. and 

 character of margin and aperture, as in .1. (mnulata, Kirchenpauer, .1. turgida ('lark, and 

 ..1. gigantect Clark. In all of these cases the operculuni is evidently of a sinyle adcauline flap. 



With /)if>lin.tiii, in the character of the margin and operculum. This prevails throughout 

 the yenus. and makes it necessary to consider other characters that are yiven in the definition of 

 the yenus .\!ii<>i/nii'ii/. particularly the shape of the hydrotheca'. In those cases where the 

 hydrotheca' arc not typically bottle-shaped, as in .1. hir<ji<l<i and .1. i/ii/iiiilfii. the orifice is still 

 much more constricted than the bodv of the hvdrotheea 1 . and in none of these cases does the 

 yonosome resemble that which is characteristic of I)!j>lum!<i. 



This ye nils is essentially arctic and north temperate in distribution, a yreat majority of 

 species occurring in particularly luxuriant colonies in the cold waters of Alaska. Not a sinyle 

 American species is found in tropical seas, and none extends south of California, on the Pacific 

 coast, or south of New Knyland, on our North Atlantic coast. ()ne species, A. <il>i< timi. extends 

 to the Mediterranean, on the east shores of the Atlantic. 



KKV I'ci TIM \\IKiac \\ M'KIIKS ill' THK (.EM'S A HIETINAIil A. 



Mi'fi' than niii'-fniirtli uf ;nlraiiliiic wall free. 



llyilriithfc.-i' not leaning forward in notii-caMc df.'rrr. 



Internoiles of sti'in fairly n^nlar. cadi l'carin;;a hruiii'li. 

 1 lydiMt'ii-i'.-r laru'' 1 ami fairly robust. 



Gonangia not top-shapeil nor annulated. 



Not more than one-third of hydro! In 'fa I \\:\\\ adnale nli'n Una. 



At least half of adcauline wall adnate. 



( M.naii.L'ia \\ illi broad aperture i;n'inlii/ix. 



( ioiiaii^ia with narrow a pert lire nu-niixtiiii.-s. 



< ionaiii.'ia top-shaped, with annular rui;o.-ities en, i. 



llyilrothei-ir small and delicate, nearly opposite (r 



"Nonliselie (i;ittiinen uinl Arten, 1SS4, pp. L'U 



llie Hydroiden des k. k. natnrliistorisehen llofmiisenni-. Is'.Mi. pp. -JJu. _')-). 



: '\'idenskal)C'liL'e Mcddelelser fra den natiirhistoriske Fofenini.', Kjiibenhax n. Isirj. p. PHI. 



