NO. 1171. HYDROIDA FROM ALASKA AND P UGET SO UND— NUTTING. 743 



SERTULARIA TENERA Sars. 

 (Plate LXII, lifiH. 1 A, li.) 



Tronhosome. — Colony atta;iniiig a height of one-lialf inch. Hydro- 

 cauhis growing from a creeping root stalk. Stem Hexuous, there being 

 a bend opposite the origin of each branch, divided into regular inter- 

 nodes, each of which bears a branch near its proximal end, and three 

 hydrothecffi, one in the axil of the branch and a subopposite pair on the 

 distal end of the internode. Branches alternate, divided into regular 

 Internodes, each of whicii usually bears four, sometimes two, pairs of 

 suboi)posite hydrothecse. 



Ilydrothecu' flask-shaped, free for half their length, the distal end 

 becoming gradually more slender and terminating in a bilabiate orifice. 



GonoHome.^ — Gonangia ovate with a round aperture, growing from 

 the bran(;hes below the bases of the hydrothece. 



Locality. — St. Paul Island, Alaska, Collected by Mr. Trevor Kin- 

 caid. 



The collection contained five ajiparently new si)ecies, as described 

 below. 



CAMPANULARIA KINCAIDI, new species. 

 (Plate LXII, (i;,'s. 2 A-C) 



Trophosome. — Hydrocaulus springing from a creeping root stalk, 

 unbrandied, peduncles long, rather slender, with three to ten anuula- 

 tions immediately below the hydrotheca, two to five at the proximal 

 end, and sometimes a few on the middle i)art. 



HydrothectC small, sometimes minute, about three times as long as 

 broad, tubular, with parallel sides; aperture armed with seven to ten 

 long, shari)ly pointed teeth; hydrotheca:; fluted lengthwise, the number 

 of flutiugs corresponding to the number of teeth. 



Gonoso m e. — U n k n own . 



The amount of variation among individual hydrothecje is very great, 

 both as to size and the number of teeth and fiutings, the smaller and 

 presumably younger ones having but few teeth. The general shape 

 and ornamentation seem (piite constant, however. The fiutings are 

 very deep and distinct, as indicated in fig. 2 C, which represents the 

 outline of the orifice. The hydrothec c of this 8])ecies greatly resemble 

 those of Ohelia hieuspidata Clark ^ in shape, but the teeth of the latter 

 are rpiitc; differenf, and the manner of growth of the two s})ecies pre- 

 cludes any likelihood of their being identical. The present form bears 

 some resemblance to C. kinclcfiii,' but is very much smaller, while the 



'Notfouud by the original describer, Sars. It is figured, however, iu Hydroiden 

 vou Ost-Spitzbcrgf-ii, Marktaniier-Tnrn<Tetscher, pi. 11, fig. 14; pi. 12, fig. 5. The 

 latter figure showf- that the goiiangiurn is provided with an aciocy.st. 



2 Report on the Hydroids collected on the loast of Alaska and the Aleutian Islands 

 by W. II. Dall, Proc. Acad. Nat. Sri., Philadelphia, 1876, p. 50, pi. ix. 



'A Catalogue of the Zoophytes of Northumberland and Durham, Trans. Tynesido 

 Nat. Field Club, 1857, p. 37, pi. ii, lig. 9. 



