266 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 4 



theca is placed a short distance from the distal end in each case. The inter- 

 nodal septa are present but are not strongly marked. The supracalycine 

 nematophores present no unusual features; there are 2 mesial nemato- 

 phores on the first internode and 3 on each of the others, proximal to the 

 hydrotheca. There is the usual pseudonematophore on the hydrocladial 

 process, with a normal nematophore proximal, and one distal to it. On 

 the cauline internodes, the number of nematophores differs; in the proxi- 

 mal portion of the stem, there are most commonly 2 nematophores, not 

 far apart, proximally, and a single one distally, on each side of the inter- 

 node, but one of these, most commonly the distal one, may be missing. 

 Distally, there may be the same number between 2 hydrocladia on the 

 same side of the stem, but the change in position on the internode, of one 

 of the hydrocladia, displaces to some extent the exact position of some of 

 the nematophores. 



Gonosome. — Not observed. 



Distribution. — Station 1276-41, 10^ miles west of Point Dume, 

 Calif., 47-48 fathoms. 



Remarks. — This species is very similar to A. mutabilis Fraser, but the 

 relative position of the opposite and alternate hydrocladia is inverted, 

 since in A. mutabilis, the proximal hydrocladia are alternate and the dis- 

 tal, opposite or sub-opposite. There is no clue as to which species is the 

 older. 



Antennularia irregularis Fraser 

 A ntennularia irregularis Fraser, Hancock Hyd., 1, 1938, p. 59. 



Fraser, ibid., 2, 1938, p. 111. 

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

 Distribution. — 1 mile north of San Pedro Point, Santa Cruz Island, 

 45-46 fathoms. 



Antennularia mutabilis, new species 



Plate 34, Fig. 35 



Trophosome. — The slender colony, 7 cm, grows singly; the stem is 

 relatively slender, without distinct nodes. The hydrocladia are in the 

 same plane or nearly so, in the proximal portion of the stem, arranged in 

 quite regular alternation, but in the distal portion, they are definitely de- 

 cussate. The hydrocladial process is of medium length, about half the 

 length of the first internode ; a pseudonematophore is present. The nodes 

 are well marked, but the internodal septa are indistinct or absent. On 



