Vou. 2] Torrey.—Hydroids of the San Diego Region. 9 
The San Diego material consists of three stem fragments 
which are provisionally placed in this species. The definition is 
Allman’s (771), with a few shght verbal changes. 
5. Eudendrium sp. 
A fragment of a colony, consisting of hydrorhiza and a few 
very short stems, was taken at Point Loma, June 27, 1903. The 
perisare is sparsely and wavily annulated. Female blastostyles 
with tentacles. 
Fam. HybDRACTINIIDAER. 
Gen. Hydractinia, Van Beneden, 1844. 
6. Hydractinia californica, n.sp. 
= 
Trophosome. Sterile hydranths 2 to 2.5 mm. long in extension, with 
6 to 10 tentacles, usually in 2 recognizable whorls; proboscis domed to con- 
ical. Spines .5 to .9 mm. long, conical, often with truncated tops and 
irregular protuberances; with about 10 longitudinal dentate ridges. 
Gonosome. Sporosacs, with 1 or 2 eggs in female, borne in clusters 
of 2 to 10 or more about half way from the base of the blastostyle. Latter 
with 5 to 10 knob-like clusters of nematocysts representing tentacles; 1 to 
1.3 mm. long. 
Colors. Perisare deep brown, fleshy parts white. 
Distribution. Off San Diego, in 50 fathoms. Covering the 
shells of Dentaliwm polygonum inhabited by hermit erab. 
This species is very closely allied with H. echinata (Flem.) of 
Europe and H. polyclina Ag. of the eastern United States, which 
are themselves almost indistinguishable. It appears to differ 
from them in its much smaller number of tentacles. The latter 
arise in threes, fours, or fives, or irregularly; there is no single 
typical method. 
Fam. PENNARIIDAE. 
Gen. Corymorpha, Sars, 1835. 
7. Corymorpha palma. 
Corymorpha palma, Torrey, 1902, p. 37; 1902a, p. 987. 
Trophosome. Stems each 6 to 14 cm. long, rooted in sand by a 
dense tangle of filamentous processes, and covered by perisare proximally 
