112 allan hancock pacific expeditions vol.4 



Description of New Species 



Abietinaria expansa, new species 

 Plate 16, Fig. 1 



Trophosome. — Colony (largest fragment 5 cm. high) rather rigid, 

 with a rigid main stem, which is almost straight, the sinuosities being 

 very slight, a few large branches making a wide angle with the stem, 

 somewhat irregularly placed, each looking like a portion of the main 

 stem. The smaller, unbranched branches are quite regularly placed, 

 alternately, on the two sides, usually with the hydrothecae on the stem 

 between two successive branches on the same side. These small branches 

 are rigid also, and the branches, large and small, are in the same plane. 

 The whole colony is much spread out. The nodes on the stem and on 

 the branches are well marked but are not regularly placed. The 

 hydrothecae on the branches are subopposite, rather than alternate, 

 swollen at the base and narrowing to a neck, i.e., of the abietina type, 

 about one-half free; margin entire. 



Gonosome. — Gonangia appear along the face of the branches, not 

 regularly spaced. In face view, they are pear-shaped, with a short, curved 

 pedicel, a distal neck, with an oval aperture. The other diameter is 

 much less and hence the gonangium is elliptical in side view. Length 

 1.0 mm., greater diameter 0.5 mm., lesser diameter 0.3 mm. 



The trophosome of this species is very similar to that of A. amphora 

 Nutting. The main difference is in the few large branches that are 

 again branched; the pairs of hydrothecae on the branches are rather 

 more distant. 



The gonosome in the two species bears little resemblance. The large 

 gonangia with prominent ridges, clustered on the main stem, of A. 

 amphora are little like the much smaller solitary gonangia on the 

 branches of A. expansa. 



Aglaophenia longicarpa, new species 

 Plate 16, Fig. 2 



Trophosome. — Colonies up to 10 cm. in height, with dark brown, 

 almost black, somewhat flexible, main stem, and light brown hydro- 

 cladia; these well graded in length, but, at the greatest, not more than 

 15 mm. long. Main stem divided into regular internodes, each with a 

 hydrocladium arising from a process near the distal end; the hydro- 

 cladia coming off in regular alternation from the stem, two of them in 



