Vou. 2] Torrey——Hydroids of the San Diego Region. 29 
30. Sertularella turgida (Trask). 
Sertularia turgida, Trask, 1854, p. 113, pl. 4, fig. 1. 
Sertularella turgida, Ciark, 1876a, p. 259, pl. 38, figs. 4, 5. 
Sertutarella conica, Calkins, 1899, p. 359, pl. 4, fig. 22. 
Sertularella nodulosa, Calkins, 1899, p. 360, pl. 5, fig. 29. 
Sertularetla turgida, Hartlaub, 1901, p. 360, pl. 21, figs. 5, 6. 
Sertularella turgida, Torrey, 1902, p. 64, pl. 7, figs. 59-62; pl. 8, 
figs. 63-69. 
Trophosome. Stems stout, from creeping stolon, about 30 mm. long, 
seldom branching; divided into short geniculate internodes. Hydrothecae 
large, stout, free for about half their length; aperture large, with 3 
strong teeth. 
Gonosome. ‘xonangia large, ovate, distally spinose or annulated or 
both; aperture small. 
J 
Figs. 22, 23.—Sertularella turgida. Gonangia. 
Distribution. Pacific Coast, from Coronado Is. to 54° N. lat. 
Off Japan (Albatross hydrographic station 3775). Between 
tides to 204 fathoms. 
This is by far the most variable species on the coast, a char- 
acteristic to which reference was made in my former paper 
(:02, p. 65). Figs. 22 and 23 make more complete the transi- 
tions between forms of gonangia there figured. From a spiny 
type an annulated type is reached through a spiny-annulated 
condition. The hydrothecae are extremely variable, as regards: 
shape, wrinkling and immersion. The internodes vary much in 
leneth and thickness. 
