NO. 5 FRASER : HYDROIDS 267 



most of the hydrocladia, the internodes are all thecate; the first one is 

 shorter than the others, with the hydrotheca near the middle; in the 

 others, the hydrotheca is about one-third the distance from the distal end. 

 Occasionally, in the distal portion of the hydrocladium, an extra node is 

 introduced to divide the normal, long, thecate internode into a proximal, 

 athecate internode and a distal thecate internode. The supracalycine ne- 

 matophores are rather long; there is 1 mesial nematophore on the first 

 internode, proximal to the hydrotheca, and on the others, 2, or occasion- 

 ally 3 nematophores ; when the extra internode is introduced, 1 nemato- 

 phore remains with the thecate internode. There are 2 nematophores at 

 the axil of the hydrocladial process, 1 on each side, and a single one 

 farther out than the pseudonematophore. In the proximal part of the 

 stem, there are 2 nematophores between 2 hydrocladia on the same side, 

 and in the distal portion, there are 2 pairs of nematophores a short dis- 

 tance above each pair of processes. 



Gonosome. — Not observed. 



Distribution.— ^t2it\on 1254-40, 8 miles SW of Cedros Island, 63-65 

 fathoms ; in the same general area, 45-46 fathoms. 



Antennularia parva, new species 

 Plate 35, Fig. 36 



Trophosorne. — The plumose colony is very small for this genus, only 

 9 or 10 mm in height ; there are few nodes in the stem, irregularly placed ; 

 these are as strongly marked as they are in A. constricta Fraser. The 

 hydrocladia are arranged in 2 irregular series, an intergrade between the 

 regular alternate, and the decussate arrangement. There is variation in 

 the distance between 2 hydrocladia in succession. The hydrocladial process 

 is shorter than the average. The longest hydrocladium is 4 mm; the di- 

 vision into hydrocladial internodes is not constant, but most frequently, 

 the first 2 internodes are thecate, and then athecate and thecate internodes 

 alternate. The septum near each end of each internode is well marked. 

 In all the thecate internodes except the second, the hydrotheca is placed 

 near the middle of the internode ; the second is longer than the others, and 

 appears to include what corresponds to the athecate, and the succeeding 

 thecate, internodes, in the remainder of the hydrocladium, but there is no 

 sign of a node separating the 2 parts; in consequence, the distance from 

 the hydrotheca to the proximal node is at least twice that to the distal. 

 There is a pair of nematophores in the axil of the hydrocladial process, 

 and a single one farther out; in all of the thecate internodes but the sec- 



