NO. 5 FRASER : HYDROIDS 263 



Genus ANTENNELLA 



Antennella avalonia Torrey 

 Antennella avalonia Torrey, Hyd. Pacific Coast, 1902, p. 74. 



Fraser, Hyd. Pacific Coast, 1937, p. 181. 

 Fraser, Hancock Hyd., 1, 1938, p. 57. 

 Fraser, ibid., 3, 1938, p. 135. 



Distribution. — 2^^ miles east of South Point, Santa Rosa Island, 15- 

 21 fathoms; 3 miles east of South Point, 23-26 fathoms; 5 miles SE of 

 Santa Catalina Island, 140-150 fathoms; 1 mile NW of White Cove, 

 Santa Catalina Island, 31 fathoms; South Bay, Cedros Island, 10-15 

 fathoms. 



Antennella gracilis Allman 



Antennella gracilis Alu^i AN, Gulf Stream Hyd., 1877, p. 38. 

 Fraser, Hancock Hyd., 1, 1938, p. 58. 

 Fraser, Atlantic Hyd., 1944, p. 315. 



Distribution. — Off Magdalena Island, Ties Marias Islands, Mexico, 

 13 fathoms. 



Genus ANTENNULARIA 

 Antennularia constricta, new species 



Plate 33, Fig. 31 



Trophosome. — The plumose colony, 5 cm, has less difference in the 

 relative size of the stem and the hydrocladia than is usual in this genus, 

 because the stem is not very stout and the hydrocladia are not especially 

 slender. The stem is divided into internodes of varying length by nodes 

 so well marked that the stem is definitely constricted where they appear; 

 there may be 1, 2, or 3 hydrocladia arising from an internode. The hydro- 

 cladia are arranged in 2 series, in an approach to regular alternation, 

 nearly, but not quite, in the same plane. The hydrocladial process is of 

 medium size, with a definite pseudonematophore. In many of the hydro- 

 cladia all of the internodes are thecate, the first one shorter than the 

 others, but in some instances, in the distal part of the hydrocladium, extra 

 nodes may be inserted to divide the long internode into two internodes, 

 the proximal being athecate and the distal thecate; the hydrotheca appears 

 much nearer the distal node; there are no distinct, internodal septa. On 

 the hydrocladial process there are 2 nematophores in the axil, proximal 

 to the pseudonematophore, and 1 distal to this ; on the first thecate inter- 



