94 AMERICAN HVDKOIDS. 



SERTULARELLA COMPLEXA, new species. 

 (Plate XXI, ii^'s. 5-9.) 



TriiplniKonii'. Colony attaining u height of about 3 inches, exceedingly .straggling in habit, 

 the stem and branches being verv long and slender, the latter often anastomosing, forming a rude 

 mesh, in which the stem and brandies arc hardly distinguishable from each other. Stem slightly 

 tlexuose in places, divided into regular short internodes, each with a single hydrotheca, or in 

 other places with nodes not perceptible. Branches growing at right angles with the stem, them- 

 selvcs branched irregularly, often the terminal branches being dichotomous, the distal ends of 

 branches often anastomosing lirmly with other branches. 



Hydrotheca.'. fairly distant, quite short, about the distal third free, and much constricted by 

 the leyeling off of the adcauline side; margin with four rather low equidistant teeth; operculum 

 four-flapped. 



liiniaxanii'. (ronangia borne in rows along the stem and branches, small, regularly oval, with 

 broad, even annulations over the entire surface; aperture round, not elevated on a neck, and sur- 

 rounded at some distance by a series of from three to seven blunt tooth-like points. 



Distribution. Albatross Station 2843, lat. N. 53 5(3', long. W. Lti5 5(5', 45 fathoms; 

 Station 2S.-.3. lat, N. 5(i , long. W. 154 3d', 15'. fathoms; Station 2858, lat. N. 58'- 17', long. W. 

 148 36', 2::o fathoms; Station 3500, lat. N. 5ii (>:>', long. W. 169- 30', 121 fathoms. 



This species occurred quite abundantly in the U. S. Fish Commission steamer AHmtrnss 

 ill-edgings oh" the Alaskan coast. At first sight it greatly resembles in mode of branching, shape 

 of hydrothecie, etc., .V. iJic/intnn,,^ but the four hydrotheca] teeth, and particularly the unusual 

 structure surrounding the mouth of the gonangia, render it, in my opinion, a distinct species. 



Tijl>, .s//V/,.v. -Cat. N 7 o. 19745, U.S. N.M. Cat. No. 18696, Museum State University of Iowa; 

 also in collection of the author. 



SERTULARELLA PINNATA Clark. 

 [ I'lah- XX!. lijrs. 10-1L'.) 



Sertidarella pinnata CLA.RK, Alaskan IIy<ln>i<ls, 1S7H, j>. u'L'fi. 



SerCularetta pinnata MERESCHKOWSKY, Ann. and MULT., 5th SIT., II, ISTS, p. 450. 



Sertularellct fruliculosa KIKCHENPAUER, Xonlischr < lattun^cn, lss4, p. 50. 



'.' ,Vi -ii'liti -i-l/n /liiiiiiiln LOHKN-/, Inu-niat. I'olarfnrsrh. Jan Mayen, 1886, III, p. -. 



y s, i-tiiliin-llii jiiiiniiiii MAHKTANNER-TURNERETSCHER, Hydroiden aus den k. k. naturh. Hoi'mnsfnms, isno, p. L'L'O. 



Sertularella pinnata HAUTI.AUU, Revision der Sertularella-Arten, liiOO, p. 40. 



'/'/'iiji/itixii/in'. Colonies growing in dense clumps, sometimes attaining a height of about 1 

 inch. Stem not fascicled, divided into regular short internodes each of which bears a branch 

 and an axillary hydrotheca. Branches alternate, divided into regular internodes which are very 

 short, each bearing a hydrotheca on a very broad shoulder on the internodes, the nodes being 

 opposite the middle of the hydrotheca;, often branching dichotomously; branches themselves 

 often branching dichotomously, nodes very deeply cut, giving sharp constrictions of the thick 

 perisarc. Hydrotheca' inclined forward and outward, appearing in front view to be borne on 

 the front of the branches, very closely approximated, short, stout, the distal half free; margin 

 greatly and abruptly expanded and rimmed, with three very large pointed teeth, the two outer- 

 most being the larger; an intrathecal ridge extends horizontally from a constriction in the outer 

 wall around the inside of the hydrotheca to about the middle of the side wall. The floor of the 

 hydrotheca is of very thick chitin with a pointed process extending downward from the posterior 

 lateral cornel's. 



tiniHixiiiiii . --( Jonangia borne in double rows on the front of the main stem and branches, 

 large, broadly ovate, exceedingly rugose, the rugosities not being even and parallel, as in other 

 species, but sinuous, giving a peculiar appearance of distortion; aperture broad, round, not 

 mounted on a collar. 



I>ixfril>it/!<>ii.- I'nalaska, Coal Harbor, Shuinagin Islands, Lituva Bay, 112 fathoms (Clark). 



This species excels all others that I have seen in a general appearance of rugosity, the chiti- 

 uous periclerm being very thick and much wrinkled. 



