388 CORY.MORPHA NUTANS. 



CORYMORPHA NUTANS, S(irs. 

 Plate XIX. 



CoRYMORPHA NUTANS, — Sofs, Beskrivelser, 1835, p. 6, pi. i, fig. 3. Forbes and Goodsir, 

 Ann. Nat. Hist., 1840, vol. v, p. 309. Johnson, British Zooph., 

 1847, p. 54, pi. vii. Sars, Forhandl. i Vid. Selsk. i Christiania, 

 1859 J trans, in Wiegm. Archiv, 1860, p. 3341, and in Ann. 

 Nat. Hist., 1861, p. 353. Hodge, in Trans. Tynesdale 

 Naturalist's Field Club, toI. v, p. 80, pi. ii, figs. 1 — 9. Atlman, 

 in Ann. Nat. Hist, for May, 1864. Hincks, Brit. Hydr. Zooph., 

 p. 127, pi. xxii, fig. 2. 



TROPHOSOME. — Htdrocaulus attaining a height of from two to three inclies, 

 and having in its tliickest part a diameter of about two lines, sub-cylindrical, usually 

 enlarging towards the base, and again contracting and tapering away to a blunt point at 

 the proximal end, the proximal pointed end bent at nearly a right angle to the rest ; 

 behind the short papillary projections which are emitted from the stem near its proximal 

 end are numerous very fine long capillary filaments ; the whole stem marked with 

 narrow longitudinal bands ; the pellicle which takes the place of the perisarc very thin, 

 filmy, and colourless, closely embracing the ectoderm in the greater part of its extent, 

 but towards the proximal extremity separated from it by a considerable interval, and 

 here forming a loose corrugated sac in which the pointed extremity of the stem is 

 enveloped. Htdrantiis with a proximal zone of about thirty-two long tentacles, and 

 a distal one of about eighty, which are very much shorter and thinner than the 

 proximal, and form a brush-like group, composed of six or seven closely approxi- 

 mated verticils. 



GONOSOME. — Peduncles of gonophores fifteen to twenty in number, springing 

 in two alternating verticils from the body of the hydranth immediately within the 

 proximal zone of tentacles, and carrying the gonophores in clusters at the extremities 

 of their branches. Gonophores with the summit of the umbrella continued into a 

 short conical projection ; marginal tentacle rendered moniliform by clusters of thread- 

 cells. 



Colour. — Hydranth light red from the mouth to the proximal set of tentacles ; stem very 

 pale red. Peduncles of gonophores, manubrium, bulbous terminations of radiating canals, and 

 nodules of marginal tentacle light red. 



Bevelopuent of Gonosome. — June to September. 



