THK SKKTri.AKin^E. 1'Jl 



straight, the basal part being flask-shaped, and the distal portion tubular and not curving as in 

 allied .species, about tlic distal lull' five, ami both upper and lower outline- of free portion-, em 

 cave; aperture oval, margin without definite teeth, although il is often more or less sinuous and 

 sometimes with several reduplications; hvdrntheea 1 directed forward, upward, and oiit\\ard; 

 <>])erciduiii a single adcauline valve. 



Gono8om.e. -Gonangia l>orne mostlv in rows on upper sides of distal (tranche--, small, ovoid, 

 without neck; aperture oltscurely polygonal, marked by four or live line dark meridional lines 

 giving the eH'cct of radial canals on sessile medusa'. 



///..TV///////,-/,. --.l//W/v.v Station i's41. lat. N. ,M Is', long. \\ . n;;, ;,;,'. ;,r, fathoms; Station 

 :i.V.t',', hit. N. ;>i' 5', Ion--. W. 177 4u'. ;,;, fathoms. 



This tine sertularian ditl'ers materially from others of the genus in having the hvdrolhee;e 

 standing out rigid and straight, without the gentle curve to the distal free portion that u'ives 

 such grace to the other species of the germs Abietinaria. The margin is apt to lie jagged and 

 have the appearance of being toothed, hut this is not constant. The medusa-like appearance of 

 the gonangia is often quite striking. I take pleasure in naming this species after my friend, 

 Mr. A. B. Alexander, whose long and faithful service on the I'. S. Fish Commission steamer 

 Alliiitnixx has done so much for the cause of deep-sea investigation. 



TI/J>. *//</.*. Cat. No. r.tsl'.i. t'.isi'o I'.S.N.M.iCat. No. H-744. Museum of State Cuiver-ity 

 of Iowa; also in the collection of the author. 



ABIETINARIA GREENEI I Murray). 



(Plat i- XXX VI, tiirs. 1-8.) 



Si'i-liilin-iii lr!ciiK]iiil<il<i .MruiiAY, Ann. and Ma;,'., '.'\ SIT.. V, isiill, ],. L'.iil. 

 .S'i lin/nriii '/''"'"' -Mi'UKAY, Ann. and Ma>;.. .'id scr.. V, ISliO, j>. ."iit-1. 

 ( 'iiliiliini i/riTni i A. AIIASSIH, Xiii'th American Arule|i!i:i j , ISIi.'i, ].. 117. 

 K'l-lti/iti-iii greenei CI.AUK, Ilydrniclc ( 1'acilic Cnast. IS7ii, ]i. L'.'i". 

 Ki'rtiiliti-i'llii i/ri'ini-i HAKI'I.AI n, Kexisinn dcr Scrtiilai'dla-A rten, 1!M)(I, p. 14. 

 Sertularia tfreeneiToRRFA', II ydmida ni' I'ac-iiic Cnasi, I '.MIL', ]>. i>'.i. 



'I'/'o/i/ioxii/in.- ( 'olony a dense cluster of erect stems. Stem attaining a height of ahout 4 

 iiK'hes, not fascicled, slightly sinuous, with a few annulations at its Itase. \\ith a double row of 

 Subopposite to subalternate hydrotheca- throughout its length, divided into very irregular inter- 

 nodes by straight nodes. Hranches rather distant, alternate, erect, each with a deep constriction 

 at its base, divided into irregular internodes. but distallv with a tendency to a regular division, 

 with a sinirle pair of h vdrothecie to each internode. Branches often subdividing into alternate 

 branchlets, and often ending in a dichotomous branching. Hydixxthecse subopposite to subalter- 

 nate, flask-shaped, the freo distal portion narrowing and curving upward so that the aperture is 

 horizontal, margin varying from a perfectly round plain rim to the production of two strong 

 teeth on the abcauline side. The operculum consists of a single adcauline Hap. 



< ri/iiiixoiiii'. (ionangia borne on front of branches, conical to oblong-oval in shape, rather 

 feebly but distinctly anuulaled throughout, ending in a short tubular collar and round aperture 

 which is often surmounted bv an acrocvst when the sexual products are mature. 



DistTibtition. Tomah's Point. Monterey, Punta Keves, San I'"rancisco. and Santa ('ru/ 

 (('lark): N'aneouver Island (.1. M. l>awson): Point Kenfrew. \'ancou\-cr Island I.Mrs. (\. (iibbs). 



This is a most puzzling species. It can not go into- .the genus iStf/^M/awe^a, as here defined, 

 and the extreme variability of the marginal structures makes it djlliciilt to decide whether it 

 should go into T/n/i/ii'in or . \/><< fimii-in. The teeth. howe\c>r. arc not lateral, but alteauline. and 

 often the margin is perfectly round, in which case we have the typical abietinarian structure. 

 Both margins are found in everv colonv that I have examined, the smooth-rimmed hydrothecue 

 being more abundant in proximal ]iarts of stem and branches, and those with teeth in the distal 

 parts. Yerv rarelv a three-toothed margin is seen. I am indebted to Mi's. (i. (iibbs for excel- 

 lent specimens from which the above description and the drawings were made. 



