120 AMKRICAN HYDROIDS. 



ABIETINARIA GRACILIS, new species. 



Troji/Hixoiiii'. The largest colony examined was about ."> inches high. Main stem straggling 

 in habit, nearly straight below the lowest branch, the branch-bearing portion being geniculate, 

 divided into irregular internodes, the tendency being to have a branch and two hydrothecsa on 

 one side and one hydrotheca on the other. Branches distant, irregularly alternate, often dividing 

 into brandilets, usually arising from near the base of a hydrotheca, but sometimes springing 

 from the lumen of the hydrotheca as in the specimen figured; divided into irregular internodes. 

 some of which bear but one or two hydrothecse. Hydrotheca 1 subopposite to alternate, more 

 distant than in other species of the genus and more slender distally; basal portion flask-shaped, 

 more than the distal half free and gracefully narrowing until near the end, where it expands into 

 an everted rim around the aperture which is abruptly turned upward; operculum consisting of 

 one adcauline flap. ' 



(riiiiii.f/n/if. (lonangia borne on front of main stem, flask-shaped, with short neck and round 

 aperture, ornamented externally with about six conspicuous longitudinal ridges. 



D;*tr;itt!<>ii. An>fitr<>xx Station 2873, lat. N. 48 30', long. W. 124 57', 40 fathoms; Station 

 3480, lat. N. 52 tt>', long. W. 171 45', 283 fathoms; Station 359!), lat, N. 52 1 " 05', long. E. 177 

 40', 55 fathoms. 



The hydrotheca- of this species are among the most elegantly formed that I have seen among 

 the Sertularidae. The whole structure of the colony is much less compact than in its allies, 

 bearing more distant branches and hydrotheca' and having a more straggling habit of growth. 

 The hydrotheca' are about the size of A. ^Hn-ulu, but their shape is entirely different, as can be 

 seen by comparing the figures. 



Tiy,,' *//V/,x. Cat. Nos. I'.t'.tU. 1!!15, ILS.N.M. Cat, No. 18754, Museum of State University 

 of Iowa; also in the collection of the author. 



ABIETINARIA COMPRESSA ( Mereschkowsky). 



(Plate XXXV, li s s. 3-4. ) 

 Krrliiliirin fiiiiijiri-iuai MKRESCIIKOWSKV, Ann. and Ma^.'., oth ser., II, 1.H7S, p. 446. 



it Trophasome.- -Hydrorhi/a in the form of stolons. Hydrocaulus short, erect, not angular, 

 rather rigid, divided into irregular internodes, only giviii"' off very few ramifications. Branches 



e o / B B *.' 



arranged alternately and regularly on two sides of the principal stem, straight, also divided into 

 irregular internodes. Ilydrotlieca- arranged alternately, subopposite, one to three pairs on each 

 internode, the base inflated and rounded, the upper half strongly compressed in a plane vertical 

 to the plane of ramification of the colony. Aperture oval, compressed, long but narrow, with 

 two angles on the two sides, and two very slightly developed teeth." 



I i i, a i KI inn-. Unknown. 



Locality. Port Ajan (M. Wosnessensky). 



I have not seen this species, and have copied the original description entire. 1 am unable to 

 rind any mention of Port Ajan in the atlas at my disposal, and the species may not be American, 

 although all specimens described by Mereschkowsky in the article referred to are from the North 

 Pacific. 



Type. In the collection of the Academy of Sciences, St. Petersburg. 



ABIETINARIA ALEXANDERI, new species. 



(Plate XXXV, %s. n-H. ) 



Tropkosome. Colony attaining a height of about ii inches. Main stein straight, divided into 

 fairly regular internodes, each of which ordinarily bears a branch and two hydrotheca' on one 

 side and a single hydrotheca on the other. Branches alternate, rarely giving forth branchlets, 

 divided into irregular internodes each bearing several hvdrotheca-. llvdrotheca 1 subalternate. 



