NO. 5 FRASER : HYDROIDS 253 



length, and then projects outward, nearly at right angles to the face of the 

 hydrotheca; the 3 cauline nematophores on each internode are of the 

 usual type. 



Gonosome. — The corbula is of median size with 8 pairs of leaves; 

 except for the taper at the proximal end it is nearly cylindrical. The 

 nematophores are rather small and farther apart than usual ; the basal one 

 does not form a spur, but there is a perforation on the proximal side of 

 the ridge opposite it. There are 2 hydrothecae between the corbula and 

 the stem. 



Distribution. — Station 885-38, San Luis Obispo Bay, Calif., 8-14 

 fathoms; near mouth of the Salinas River, Monterey Bay, 10-13 fathoms; 

 off Point Arguello, 15-30 fathoms; off El Segundo, 30-31 fathoms; off 

 Huntington Beach, 3-5 fathoms. 



Aglaophenia diversidentata, new species 

 Plate 30, Fig. 24 



Trophosome. — The largest fragment of a colony obtained was 4 cm 

 in height; the hydrocladia up to 9 mm, are well spread out so that pos- 

 sibly the colony is larger than the average. The stem is dark horn color, 

 and the hydrocladia are almost white; the stem is divided into regular 

 internodes by nodes that are not strongly marked, each of which gives off 

 a hj^drocladium, farther from the distal node than usual, frontally placed, 

 projecting forward at first but soon curving so that the main part of each 

 is in much the same plane as the stem and the hydrocladium on the other 

 side of the stem. In the hydrocladia the nodes are rather faint but dis- 

 tinct. The hydrothecae are placed quite close together as they occupy all 

 of the internodes. There is 1 short internodal septum opposite the hydro- 

 thecal septum. The distal end of the hydrotheca projects well outward 

 but even at the margin the diameter is not as great as the length. The 

 septum is distinct but short. The margin provides the distinctive feature. 

 There are 9 teeth present, but they are strongly diverse ; the median tooth 

 is quite small, and is acute ; the first lateral is large, rounded at the tip, 

 and projects well forward, often entirely hiding the median tooth from a 

 lateral view; there is a deep, broad sinus between the first and second 

 lateral; the second and third laterals are much the same size, long and 

 slender, acute but not very sharp pointed ; the sinus between the two is 

 quite narrow; the fourth lateral is quite low, sometimes scarcely showing. 



