HYDROIDS OF BEAUFORT, NORTH CAROLINA. 



379 



is little space between any two in succession; it is stout as compared with its depth and is provided 

 witli eight deeply cut marginal teeth; supracalycine nematophores reach about to the level of the 

 margin of the hydrotheca and the mesial nematophore is about half the height of the hydrotheca; a 

 small portion of its distal end is free. 



Gonosome.— " Corbuls long, cylindrical, with 12 to 14 pairs of leaves when mature; leaves closed, 

 each with a row of nematophores along its distal edge, and a short, stout spur at its base."— Nutting. 



Distribution. — On floating Sargassum and on sponge dredged by the Fish Hawk. 



Many specimens of this species were obtained but there was no gonosome present. The description 

 and the figure were taken from Prof. Nutting's monograph. 



Genus LYTOCARPUS. 



Trophosome.— Stem fascicled, with large, triangular nematophores and a perforated process at the 

 base of each hydrocladium; both the supracalycine and the mesial nematophores may have two 

 openings. 



Gonosome. — "Gonangia borne on hydrocladia 

 which are modified to form protective branchlets 

 often aggregated into a pseudo-corbula, which 

 differs from a real corbula in the fact that its 

 leaves are formed by modified hjdrocladia instead 

 of appendages to hydrocladia, as in the genus 

 Aglaophenia. The gonangia take the place of 

 hydrothecae in the species which I have examined, 

 and there is a hydrotheca on the proximal part of 

 each protective branch." — Nutting. 



Ljrtocarpus philippinus (Kirchenpauer). 



Agliinfyhcnia fihiltppina Kirchenpauer, Ueber die Hydro- 

 idenfamilie. Plumularida?. pt. I. 1872, p. 45. 



Lytocarpus philtppinus Nutting. American Hydroids. pt. 



I. 1900, p. 132. 



Trophosome. — Colony twice pinnately branched, 

 the secondary branches bearing the hydrocladia; no 

 complete specimens were obtained, but a height of 

 8 inches has been reported; stem, primary and sec- 

 ondary branches fascicled; hydrocladia alternate, 

 divided into regular intemodes, the nodes not very 

 distant; each intemode with two internal ridges; 

 hydrotlicca with a deep constriction in front, 

 around which the hydrotheca seems to bend, so that the margin is nearly parallel with the axis of the 

 hydrocladium; margin wavy but not ver)' definitely toothed; intrathecal ridge distinct but not very 

 long; supracalycine nematophore long, tubular, extending past the margin of tlie hydrotheca; mesial 

 nematophore long, tubular, reaching (in these specimens) beyond the margin of the hydrotheca. Supra- 

 calycine and mesial nematophores have two openings each. 



Gonosome. — "Gonangia 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 

 gonangia above the first, the remaining portion of each phylactocarp is straight and armed with 

 nematophores. " — Nutting. 



Distribution. — Dredged in Bogue Sound, lofeet ; on seaweed growing in shallow wateroff Shackleford. 



These specimens agree with those referred to by Congdon" in having the mesial nematophore long, 

 and not ending below the level of the margin of the hydrothecae as Nutting describes. No gonosome 

 was obtained. The description and the drawing for this was taken from Prof. Nutting's monograph. 



a Hydroids of Bermuda, 1907, p. 4S,(. 



Fig. ts— Lytocarpus philippinus (Kirchenpauer) A, portion 

 o( hydrocladium; B. hydrotheca, side view, more hichly 

 magnified. C. hydrotheca, frontview.morehishlyraagnified; 

 D. gonosome with phylactocarp (after Nutting). 



