NO. 1 fraser: hydroids 55 



Sertularia furcata Trask 



Sertularia furcata Trask^ Proc. Cal. Acad. Sc, 1857, p. 112. 

 Fraser^ West Coast Hyd., 1911, p. 72. 



Distribution. — Off Thurloe Point, 8-10 fathoms; South Bay, Cerros 

 Island, low tide and in 10-15 fathoms. 



Sertularia mayeri Nutting 

 Sertularia mayeri Nutting, Am. Hyd., Part 11, 1904, p. 58. 



Distribution. — Santa Elena Bay, 5-6 fathoms and 10-12 fathoms; 

 north of White Friars, 5-10 fathoms. 



Sertularia stookeyi Nutting 



Sertularia stookeyi Nutting, Am. Hyd., Part H, 1904, p. 59. 



Fraser, Beaufort Hyd., 1912, p. 375. 



Distribution. — North shore of Wenman Island, low tide; off Albe- 

 marle Point, on floating Sargassum; Santa Elena Bay, 5-7 fathoms; 

 San Francisco Bay, 2 fathoms; Pacora Island, 15-25 fathoms; Tangola- 

 Tangola, on coral at low tide; off White Friars, 25 fathoms. 



Sertularia versluysi Nutting 



Sertularia versluysi Nutting, Am. Hyd., Part II, 1904, p. 53. 



Eraser, Beaufort Hyd., 1912, p. 375. 



Distribution. — Tagus Cove, low tide; reef north of entrance to 

 Tagus Cove, low tide. 



Genus THUIARIA 



Thuiaria simplex, new species 

 Plate 13, Fig. 63 



Trophosome. — Colony unbranched, slender, 12 mm. high. Stem di- 

 vided into regular internodes by slightly oblique nodes. Hydrothecae 

 regularly alternating, one to each internode; gradually curved from 

 base to margin; of much the same diameter throughout; margin with 

 two blunt teeth; operculum of two flaps. The distal portion on the 



