30 University of California Publications. [ ZooLoGy 
Dynamena group. 
31. Dynamena cornicina McCrady. 
Dynamena cornicina, MeCrady, 1858, p. 204. 
Sertularia complexa, Clark, 1879, p. 245, pl. 4, figs. 26-8. 
Sertularia complexa, Bale, 1888, p. 769, pl. 18, figs. 1-4. 
Sertularia cornicina, Nutting, 1901, p. 359, fig. 56. 
Sertularia compleza, Nutting, 1901, p. 360, fig. 57. 
Sertularia cornicina, Nutting, 1904, p. 58, pl. 4, figs. 1-5. 
Trophosome. Stems short, slender, unbranched, rising from a creep- 
ing stolon to height of 10 to 20 mm.; divided into regular internodes each 
with a pair of opposite hydrothecae distally. Hydrothecae tubular, adnate 
in front for two thirds their length; margin with two teeth. 
Gonosome. Gonangia borne at base of stems, broadly ovate, annu- 
lated throughout, with broad aperture. 
Distribution. Coronado Is., Cal., on seaweed at the surface. 
Charleston, S. C. (MeCrady). Woods Hole, Mass. (Nutting). 
Pourtales Plateau (Nutting). Yueatan Coast (Clark). Aus- 
tralia (Bale). 
The colonies from the Coronado Islands were identical with 
S. complexa, though there were easy transitions to the typical 
trophosome of D. cornicina. I have followed Nutting in consid- 
ering the two species synonymous. 
D. cornicina is very close to 8. desmoides, from which it 
appears to differ in the absence of branches, the sharply toothed 
aperture, and the position of the nodal constrictions immedi- 
ately above rather than immediately below the hydrothecae. 
32. Sertularia desmoides. 
Sertularia desmoidis, Torrey, 1902, p. 65, pl. 8, figs. 70-72. 
Sertularia desmoides, Nutting, 1904, p. 56, pl. 3, figs. 1-3. 
Trophosome. Stems from creeping stolon, rising to height of 30-50 
mm., branching sparely and irregularly. Internodes vary in length, but 
the portion distal to the hydrothecae is never longer than the rest of the 
internode. ‘wo hydrothecae on the proximal portion of each internode, 
opposite and contiguous on one side of the stem for one half their length, 
bending sharply outward in distal half and narrowing to a smooth or some- 
what bilabiate opereulate aperture. 
Gonosome. Gonangia sessile, ovate, half as broad as long, with a 
wavy outline and broad round aperture. 
Distribution. San Diego, 1-25 fathoms; San Clemente I., 42 
fathoms: San Pedro, Cal., 13 fathoms. Albatross station 2939, 
lat. N. 33° 36’, long. W. 118° 09’ 30’, 27 fathoms (Nutting). 
Gonosome present, July, 1901, June 27, 1903. Both robust 
and attenuated varieties were obtained. 
