NO. 5 FRASER : HYDROIDS 249 



Sertularia inflata (Versluys) 

 Desmoscyphus gracilis Allman, Challenger Hyd., II, 1888, p. 71. 

 Desmoscyphus inflatiis Versluys, Mem. Soc. Zool. France, 1899, p. 42. 

 Sertularia versluysi Nutting, Amer. Hyd. II, 1904, p. 53. 



Fraser, Hancock Hyd., 1, 1938, p. 55. 

 Sertularia inflata Fraser, Atlantic Hyd., 1944, p. 283. 



Distribution. — Santa Elena Bay, Ecuador, 8-10 fathoms. 



Sertularia mayeri Nutting 



Sertularia mayeri Nutting, Amer. Hyd., II, 1904, p. 59. 

 Eraser, Hancock Hyd., 1, 1938, p. 55. 

 Distribution. — 3 miles NW of Natividad Island, Lower Calif., 30-31 

 fathoms. 



Sertularia operculata Linn. 

 Sertularia operculata Linnaeus, Syst. Nat., 1758, p. 808. 



Nutting, Amer. Hyd., II, p. 54. 



Eraser, Hancock Hyd., 3, 1938, p. 135. 

 Distribution. — Off Lobos de Afuera Islands, Peru, 25-30 fathoms; 

 South Bay, Lobos de Afuera Islands, 12 fathoms. 



Sertularia pourtalesi Nutting 

 Sertularia distans Allm AN , Gulf Stream Hyd., 1877, p. 25. 

 Sertularia pourtalesi Nutting, Amer. Hyd., II, 1904, p. 59. 



Eraser, Atlantic Hyd., 1944, p. 286. 

 Distribution. — 4 miles north of Dewey Channel, Lower Calif., 24-25 

 fathoms; Dewey Channel, opposite San Eugenio Point, 21-24 fathoms; 

 Sj/z miles south of Dewey Channel, 49 fathoms; San Juanico Bay, 24 

 fathoms. 



Sertularia stabilis, new species 

 Plate 29, Fig. 21 



Trophosome. — Colonies, growing to a height of 4 cm, but usually 

 much less, grow in line from a filiform stolon ; two colonies in succession 

 are not far from each other, but the distance between varies. The stem is 

 rigid, erect, branched. There is a pinched node just proximal to the first 

 pair of hydrothecae, but there are no other definite nodes although the 

 stem is constricted between each two pairs of hydrothecae in succession. 

 The branches grow from the back of the stem, not from the side, the 



