254 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 4 



separated from the third by a broad but shallow sinus. The supracalycine 

 nematophore overtops the margin of the hydrotheca ; the mesial nemato- 

 phore is attached to the hydrotheca for about two-thirds of the length of 

 the hydrotheca and then projects definitely outward and is rounded at 

 the tip. Of the 3 cauline nematophores on each internode, the 2 at the 

 base of the hydrocladial process differ in size; the third is farther down 

 the internode than usual ; they are all tubular. 



Gonosome. — The corbula is small, with 6 pairs of leaves, the edges 

 of which do not meet evenly in the middle line; the nematophores are 

 farther apart and more pointed than usual. There is 1 thecate internode 

 between the corbula and the stem. 



Distribution. — From piles of Standard Oil Pier, San Diego Bay, lit- 

 toral on ascidians. 



Aglaophenia epizoica, new species 

 Plate 30, Fig. 25 



Trophosome. — Colonies may reach a height of 20 cm, or possibly 

 even more, but this description was taken from a specimen 4.5 cm in 

 height ; this specimen with others like it were scattered over the surface 

 of the body and appendages of a crab ; the stem is stout and quite rigid, 

 divided into short internodes by well marked nodes ; each internode gives 

 rise to a hydrocladium, the hydrocladia being arranged alternately; each 

 hydrocladium arises from a process well on the face of the stem, so that 

 the angle between two in succession is quite small ; very soon the hydro- 

 cladia curve outward, so that, apart from the proximal portions, all of 

 them are nearly in the same plane; they project forward or upward but 

 little so that they are nearly at right angles to the stem ; they are quite 

 rigid also so that the whole colony has a stiff appearance. The hydrocla- 

 dium may be 1.5 cm in length, but a grading in length takes place so that 

 the colony is symmetrical plumose. The nodes are somewhat oblique and 

 quite well marked. There is little sign of septa except just oposite the 

 hydrothecal septum. The hydrotheca is large, the distal portion projecting 

 so much that the hydrotheca is almost triangular, with the margin almost 

 as broad as the hydrotheca is long. The horizontal septum is strongly 

 marked and reaches nearly all the way across the hydrotheca. The margin 

 is provided with 11 teeth; the median is smaller than the others and is 

 sharp-pointed ; it is almost erect ; the first lateral is much larger and pro- 

 jects well forward; the sinus between the first and second lateral is wider 



