THE SERTULAKIU^E. 99 



flexose with distant nodes. Branches irregularly alternate, themselves branching dichotomously, 

 with exceedingly distant, mules. Hydrothecse closely approximated, tubular. gradually bending 

 outward, extent of immersion varying greatly, al ..... st the entire adcauline wall being .-omctimes 

 adnate to the hydrocaulus, and at other times the distal half is free, every intergradation lietween 

 these extremes sometimes being found in one colony, margin with three well-marked and equi- 

 distant teeth and a three-flapped operculum. 



<ii>iintiiiiiii'. Gonangia la rye, home on all parts of the colony, sometimes aggregated on 

 distal portions, oblong-ovate, distal third ornamented with six to eight even annular rugosities, 

 remainder perfectly smooth; aperture small, at the summit of a small tubular neck with a slight 

 distal expansion. 



n. Southern coast of Patagonia. Koss Bay. south of Rio Negro (d'Orbigny). 

 Station 277<i, hit. S. ^1 41'. long. W. tilt 55' 30", -21 fathoms; Station 1'777. lat. S. 

 52 38', long. W. H) 10' 30", ll.7o fathoms. 



The very characteristic gonangia with smooth walls, save for a few distal annulations. seems 

 to me to serve at once for the identification of this species. Specimens collected by the U. S. 

 Fish Commission steamer Albatross agree very well with d'Orbigny's figures and descriptions. 



SERTULARELLA MAGELLANICA (Marktanner-Turneretscher). 



ll'Uitf XXIV, fiLts. 6-8.) 

 Calyptothuiaria iiiii</<'//<iiii<;i MABKTANNEH-TDHNEBETSCHER, Ilydroiilen mi* ik-n k. k. naturhist. Ilot'museums, 1900, 



p. L'44. 



i iiiiii/f/liinirii HAKTI.ACII, Revision der SertulareUa-Arten, I'.iOO, \>. 22. 



Trophosome. Colony attaining a height of about 2 inches in largest specimen examined. 

 Stem not fascicled, with several deep annulations on its proximal nonhydrothecate part, basal 

 portion tubular, broadening and flattening distally. Branches somewhat irregular, but tending to 

 an alternate arrangement, narrow at their origin, almost straight, inter nodes long and irregular. 

 HydrotheciX! alternate, large, tubular, gentle curving throughout their length; differing greatly 

 in the extent of their immersion, some on the distal parts of the colony having not more than 

 their distal third free, while some near the base of the main stem are free throughout their entire 

 length; margin with three large equal and equidistant teeth. Operculum with three flaps. 



(.fvnosoiiie. Unknown. 



Distribution. Straits of Magellan (Marktanner-Turneretseher); JAWms.v Station 2771, lat. 

 S. 51 34', long. W. 68, depth 50.5 fathoms. 



This species is remarkable in reversing the ordinary condition of affairs among scrtularians 

 in two particulars: first, the stem widens distally; second, the proximal hydrothecse tend to be 

 more exserted than the distal. 



Type. In k. k. naturhistorischen Hofnmseums. Vienna. 



SERTULARELLA MINUTA, new species. 

 (Plate XXIV, .fige. 9-10.) 



Trophosome. Colony exceedingly fragile and delicate, attaining a height of about one-half 

 inch. Stem not fascicled, strongly genieulate, divided into regular long internodes. Branches 

 very irregular, often forming a right angle with the stem, branching dichotomously, .-.lender, 

 very strongly genieulate, divided into regular long internodes each of which bears a hydrotheca 

 near its distal end. Hydrothecse distant, actually small but large in proportion to the diameter 

 of the stem and branches, slender, almost tubular, bending gently outward, almost completely 

 exserted but a small portion of the adcauline wall being adnate to the branch, margin with three 

 teeth; operculum with three flaps. 



Gonosome. (lonangia borne on stem and main branches, small, ovoid, strongly and evenly 

 annulated throughout, with a short tubular neck and slightly expanded aperture. 



Distribution. Albatross Station :'.4sn, lat. N. .VJ or,', long. \V. 171 4.".'. L'^:'. fathoms. 



This exceedingly delicate and beautiful -.pecies seems to be quite distinct. In some respects 

 it resembles a miniature of .S'. tricuspidata, and in others a miniature of X. trapica. It differ* 



