114 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 4 



Aglaophenia propinqua, new species 

 Plate 16, Fig. 4 



Trophosome. — Colonies, up to 12 cm., unbranched or very slightly 

 branched, with a heavy, dark brown main stem and light brown, almost 

 white, hydrocladia. The stem is distinctly divided into internodes, each 

 with a hydrocladial process some distance from the distal end ; the bases 

 of these processes are so much on the face of the internode, they are not 

 far from being in line, but the hydrocladia turn almost immediately to 

 the right or to the left to make the regular alternate arrangement, the 

 outer portions being nearly in the same plane. The hydrocladium is 

 divided into internodes by faint nodes; the hydrotheca occupies the 

 whole length of the internode, so that the margin of the one hydrotheca 

 is practically touching the base of the next hydrotheca in succession. 

 The hydrotheca is rather stout for the length. There are nine teeth on 

 the margin, but they are so low that the margin might be described as 

 wavy; the small, median tooth comes to a sharp point, but the others, 

 nearly equal, are more rounded. The septal ridges are faint; the supra- 

 calycine nematophores are large, over-topping the margin ; the mesial 

 nematophore extends upward for about two thirds of the length of the 

 hydrotheca and then projects but a short distance; of the three cauline 

 nematophores on each internode, the one above and the one below the 

 hydrocladial process are considerably larger than the one on the process. 



Gonosome. — Not observed. 



Aglaophenia symmetrica, new species 

 Plate 17, Fig. 5 



Trophosome. — Colonies — 18 cm. — growing in clusters; the hydro- 

 cladia are long, up to 2 cm., and graded in length very uniformly so 

 as to give a graceful symmetry to the colony. As the main stems are 

 light brown and the hydrocladia almost white, the species is a most 

 handsome one. The stem is relatively slender, with the nodes indistinct 

 or absent; the hydrocladia are given off at a wide angle and they might 

 almost be described as being in opposite pairs, rather than regularly 

 alternate. On the hydrocladia, the nodes are distinct and the hydrotheca 

 occupies practically the whole length of the internode. The hydrotheca 

 is large, 0.5 mm. long, but well proportioned ; the intrathecal ridges are 

 definite but not extensive. There are nine regularly rounded teeth on 

 the margin, the median one rather slender, erect, the second from the 



