NO. 1 fraser: hydroids 51 



Genus SERTULARELLA 



Sertularella ampullacea, new species 

 Plate 12, Fig. 58 



Trophosome. — Colony slender, lax, 7 mm. high, with one or two 

 branches or without branches. What may be considered as the stem 

 consists of a series of long sections, each of which arises from the pre- 

 ceding section, just below its terminal hydrotheca, the proximal portion 

 forming a distinct "knee" bend. When a branch is given off, it appears 

 opposite the section given off in the usual way; annulations at the base 

 of the section faint or absent. Hydrothecae elongated-ovate, the distal 

 portion forming a "neck"; surface strongly and regularly corrugated; 

 margin with four teeth; operculum of four flaps. 



Gonosome. — Not observed. 



Distribution. — Port Utria, 15-20 fathoms; Pacora Island, 15-25 

 fathoms. 



Sertularella conica Allman 



Sertularella conica Allman^ Hyd. of the Gulf Stream, 1877, p. 21. 



Nutting, Am. Hyd., Part II, 1904, p. 79. 



Distribution. — South of Clarion Island, 50 fathoms; Tagus Cove, 

 30 fathoms; James Bay, 50-70 fathoms; Black Beach, 25-40 fathoms; 

 White Friars, 25 fathoms; east of islands off Navidad Head, 25-35 

 fathoms; South Bay, Cerros Island, 10-15 fathoms. 



Sertularella exilis, new species 

 Plate 12, Fig. 59 



Trophosojue. — Small, slender, unbranched colonies, 6-12 mm. high, 

 grow from a reticulate stolon. Nodes, indicated but not definite, divide 

 the stem into internodes, each bearing one hydrotheca; hydrothecae 

 alternate, distant. Hydrotheca regularly curved upward and then out- 

 ward; smooth, much the same diameter throughout. Margin with four, 

 not very distinct, teeth; operculum of four flaps. 



Gonosome. — Not observed. 



Distribution. — Bahia Honda, 15-25 fathoms; White Friars, 25 

 fathoms. 



