NO. 3 fraser: hydroids 143 



mal internode in the hydrocladium, which is short, with a transverse 

 node proximally and an oblique node distally, does not bear a hydrotheca, 

 but all the other internodes are thecate. The hydrotheca is placed near 

 the distal end of the internode and often overtops it; it is almost as 

 broad as it is deep. The nematophores are very small; there is none 

 on the proximal internode of the hydrocladium, but there is a median 

 on each of the others, and two supracalycine nematophores with each 

 hydrotheca; they are so small that they do not reach nearly to the 

 margin of the hydrotheca. There is a nematophore on each hydrocladial 

 process of the stem. 



Gonosome. — Gonangia very small, nearly spherical, arising from the 

 hydrocladial process of each internode for some considerable distance 

 along the stem. 



Plumularia septata, new species 

 Plate 21, Fig. 14 



Trophosorne. — Colony reaching a maximum height of 12 cm., much 

 branched, the branches coming out from all sides of the stem, giving 

 a loose, bottle brush effect ; the branches are more slender than the stem, 

 usually less than 1.0 cm. long. The internodes of the stem and, even 

 more so, the internodes of the branches are strongly septate; a septum 

 near each end and one below the origin of the process from which the 

 branch or the hydrocladium is given oflf. The hydrocladia approach a 

 pinnate arrangement but as they come off the face of the stem, two in 

 succession form an angle of less than 90°, and as sometimes they are 

 nearly opposite, and at other times definitely alternate, there is not much 

 regularity; they are short, never bearing more than three hydrothecae 

 and more often two or even one. Nonthecate and thecate internodes 

 alternate, the proximal being nonthecate. The nonthecate internode has 

 a strong septum near each end ; the thecate has a septum near the base, 

 one between that and the base of the hydrotheca, and one at the base of 

 the hydrotheca. There is a nematophore on the body of each internode 

 on the stem and branch and one at the base of the hydrocladial process; 

 there is a median nematophore on each hydrocladial internode and two 

 supracalycine nematophores with each hydrotheca. 



Gonosome. — The gonangia grow from the branches, one on each 

 internode, the attachment being at the base of the hydrocladial process; 

 they are elongated oval, the distal end extending to form a bottle neck; 

 the male is longer and more slender than the female. 



