126 AMERICAN HYDRO1DS. 



HYDRALLMANIA DISTANS Nutting. 



(Plate XXXVIII, liirs. 5-9.) 



Ilililrnlliiiiiiiiii fiilniln CALKINS, II ydroids from 1'ufjet Soun<l, 1.S99, p. Mli2. 

 Ifi/ilnilliiiintiii ilixtiniH Ni-rrixi;, Hydroids from Alaska and I'lifii-t Sound, isnvi, |>. 74(i. 

 Ili/ilriilliniii/iii ilixlinin HAKTI.AIB, Hydroidcn ans dem Stillen Ocean, 1901, ]>. :'..V>. 

 HydraUmania df'sfans TORREY, Hydroida of the Pacific Coast, 1902, p. 70. 



Tfi>j>/ii>xi>iin: Colony of erect, straggling habit, attaining ; i height of about <i inches. Stem 

 not fascic-led, spirally twisted, .slender, wiry, divided into irregular, usually long internodes, 

 the tendency being to have a branch on each internode. Branches distant, spirally inserted in 

 full-grown specimens, irregularly alternate in young specimens, borne on processes from the 

 stem in the axils of which a hvdrotheca is often, not always, found; divided into branchlets which 

 are regularly alternate and divided into regular internodes each of which bears three hydrothecse 

 on its anterior or upper face, and a branchlet; branchlets divided into irregular internodes, each 

 of which bears from two to six (usually four) hydrotheciv on its upper side. Hydrothecte tubular, 

 flattened, not noticeably gibbous below, inserted in a line on the upper sides of branches, their 

 distal portions bending gracefully to the right and left alternately, the top of one not reaching to 

 the middle of the one immediately aboye it; margin much flattened, the cornel's angulatod; aper- 

 ture a much flattened oval or crescent. Operculum of a single abcauline Hap. 



'Gonosome. (Not heretofore described.) Gonangia borne on front of branch, broadly ovate, 

 flattened, with a wide aperture, distinct pedicel, and apparently without the meridional lines seen 

 in //. fiili-iita. 



Distribution. Puget Sound (Nutting). Dredged by the Young Naturalists' Society. 



Since this species was originally described 1 have obtained additional material through 

 the kindness of Prof. Trevor Kincaid, and have very carefully compared it with specimens of 

 II. fiili-ntii from Plymouth, England, with the result of confirming me in the opinion that the dif- 

 ferences pointed out before are quite constant, and that //. dixtaxx is a good species. The shape 

 of the hydrothecas of II. frniK-ixciinii, as described and figured, is constantly different from thai 

 of //. iltKttuix, being flask-shaped and twice as broad in the gibbous lower portion as at the aper- 

 ture. But a single gonangium has been found, and it is possible that it may have been flattened 

 artificially, making the figure misleading. 



Ti/j>, slides. Cat. No. l!sox. I". S. N. M.' Cat. No. l.s7H-J, Museum of the State I'ni- 

 versity of Iowa; also in the collection of the author. 



HYDRALLMANIA FRANCISCANA (Trask). 



(Plate XXXVIII, fi K . 10.) 



I'liinniliiriii j'riiiirisriiiui TKASK, Proc. Cal. Acad. Sri., I, 1S57, p. 11M. 

 Plumularia gracilis MCRRAY, Ann. and Max., Sd ser., V, ismi, p. 251. 

 Ki-rtiilni-iii ijfucilif, AIIASSIK, North American Acalephae, 1S65, p. 145. 

 HydrattmaniafranciseanaCLASK, Hydroids of Pacific Coast, is7ii, \<. L'MO. 

 Hydrattmania franci&cana HARTLATB, Hydroiden aus dem Stillen Ocean, 1901, p. ;tf>5. 

 Hydrattmania frandscana TORREY, Hydroida of the Pacific Coast, 1902, p. IS. 



"Polypodom tl or S inches high, color corneous, alternately branched, the branches pinnated, 

 one branch to each internode of the stem. The pinna; rise one above the other, are pointed, and 

 support three cells at each joint. On two specimens four cells have been met with, but may be 

 regarded as an exception rather than otherwise. The pinna' are dichotomously branched in adult 

 specimens. Cells laginculate, smooth, free, slightly decumbent; the attachment of the base is 

 marked by a slightly elevated rounded rim; apertures round and smooth." 



''Bay of San Francisco, among rejectimenta of the beach." 



I have not seen this species, and have here inserted the original description. 



Plumularia </r<trilix Murray is doubtless the same species as TT. fra-nciscana^ss Doctor Clark 

 concludes. If the character given by Murray, three cells at each joint, is at all constant, the 

 author can not regard //. fnniciscana as a synonym of //. fulcutn, in which the average is 



