NO. 2 fraser: hydroids 115 



median on each side is the largest, the first and third, similar in size, 

 the fourth smaller. The supracalycine nematophores reach to, or slightly 

 beyond, the margin of the hydrotheca; they are narrower proximally 

 than distally; the mesial nematophore reaches about half way up the 

 face of the hydrotheca, with but a small portion free; the usual three 

 cauline nematophores are associated with the origin of the hydrocladium, 

 they are all tubular. 



Gonosome. — The corbulae appear at irregular intervals on both 

 sides of the stem. The total length of the corbula, which is slightly 

 curved, is about 4 mm. The particular one described had eleven pairs of 

 leaves; the nematophores on the margin of the leaves are somewhat 

 distant and they are relatively small; at the base of each leaf margin 

 there is a prominent nematophore with a conical tip pointing to the 

 base of the corbula. There is one hydrotheca on the hydrocladium be- 

 tween the corbula and the hydrocladial process. 



Antennularia compacta, new species 

 Plate 17, Fig. 6 



Trophosome. — Colony rather short — maximum 4 cm. — with a short 

 stem that shows the fasciculation and canaliculation very readily when 

 living or freshly preserved. The hydrocladia are arranged in rather 

 definite whorls toward the base but with a more definitely decussate 

 arrangement distally; the hydrocladial process is stout and all the 

 internodes of the hydrocladium are thecate; the internodes are short 

 for this genus, with the hydrotheca placed almost centrally; the septa 

 are faint or absent. The pair of supracalycine and the single proximal 

 nematophore are present on each internode; on the hydrocladial process 

 there is a stationary one-chambered nematophore, a jointed, two-cham- 

 bered one in the axil, and another near the distal end. There is one 

 cauline nematophore between two successive hydrocladial processes in 

 the same line. 



Gonosome. — Not observed. 



Antennularia reversa, new species 

 Plate 17, Fig. 7 



Trophosome. — Colony with stout main stem — up to 45 mm. — but 

 no branches, without definite nodes. Hydrocladia in four series, irregu- 

 larly decussate, with two series inclined to the one side and two to the 

 other, so as to give somewhat of a biserial arrangement or appearance. 



iff Y 



