122 



THE PLUMULARID.E. 



KEY TO AMERICAN SPECIES OK THE OKNUS I.YTOCARPDS. 



Hydrotheoa with deep anterior constrict ion ......................................................... L. philippinus. 



Mesial nematophore adnate to the front of | Anterior prolile of mesial nematophore doubly curved ...... L. ramoaus. 



the hydrotheoa to the top of the latter. I Anterior prolile of mesial uematophore simply convex ...... L. grandis. 



( Mesial nematophore rising decidedly above middle of hydrotheca ..... 

 ., I L. clarkei. 



Mesial uematophore not reaching top ol . , nemat hore llointing forward from middle of hydrotheca; 



hydrotheca ; its distal end Iree. j free pm . t i()U * ery sh rt _ s ............................. * L ( . M ,. ( ,, g . 



I Supracaly cine nematophorea with their distal ends forked.. .L.furcatus. 

 Mesial uematophore reaching top of hydrotheca; its distal end free ................................. L. racemiferus. 



Distribution of American species of the genus Lytocarpus. 



LYTOCARPUS PHILIPPINUS ( Kirchenpauer). 

 (Plate XXXI, figs. 4-7.) 



Aglaophenia philippina KIRCHENPAUER, Ueber die Hydroidenfamilie Plnmnlarida', 1872, Pt. 1, p. 45. 

 Lytocarpus philliplnus BALE, Proc. Linn. Soc. of New South Wales, 1888, III, 2d ser., p. 786, pi. xxi. 

 Li/tocarpits philippinus MA.RKTANNER-TUKNERETSCHER, Die Hydroiden des k. k. uaturhist. Hofmuseums, 1890, p. 

 274, pi. \ i, tig. 16. 



Trophosorne. Colouy pinuately branched, the br.auches again divided pinnately into branchlets 

 which bear the hydrocladia, attaining a height of about 8 inches in an incomplete specimen; 

 stem fascicled, as are the branches and branchlets, nearly to their tips, the component tubes 

 being somewhat loosely attached, so that the anterior tube bearing the hydrocladia can be 

 stripped oft' from the others j a considerable portion of the proximal part of each branch is 

 devoid of hydrocladia; hydrocladia alternate, directed forward and outward, with a septal ridge 

 behind each iutrathecal ridge, and another just under the lateral nematophores. Hydrothecne 

 closely approximated, each with a deep constriction in front, the upper part being flexed forward 

 so that the aperture is nearly vertical ; margin with a sharp anterior tooth and a broad lateral 

 lobe on each side; iutrathecal ridge extending downward and forward; supracalycine nemato- 

 phores long, straight, tubular, reaching far above the top of the hydrotheca, and having two 

 apertures; mesial uematophore tubular, not reaching above the level of the top of the hydrotheca, 

 and having two openings; cauliue neinatophores, two between adjacent hydrocladia, and a 

 perforated process at the base of each hydrocladium. 



Gonosome. Gouangia flattened ovoid, borne on modified hydrocladia, each with a hydrotheca 

 on its proximal end; the next hydrotheca is replaced by a gonangium, and there is usually a 

 second gonangium above the tirst; the remaining portion of each phylactocarp is straight and 

 armed with nematophores. 



Distribution. -Philippine Islands (Kirchenpauer); (Queensland, Australia (Bale); Ked Sea 



