NO. 1 fraser: hydroids 11 



Systematic Discussion 



There is no necessity of saying much in the way of general discus- 

 sion under this heading. Some changes have been made in nomenclature 

 since early papers were published but nearly all of these have been 

 introduced in more recent papers hence further reference is not necessary 

 as far as they are concerned. There is one additional change. On ac- 

 count of priority difficulties, the genus Pasythea becomes Pasya, the 

 name introduced by Stechow. 



One new genus, Eugemmaria, is introduced that bears enough re- 

 semblance to Gemmar'ia to justify the name. 



Suborder GYMNOBLASTEA 



Family Glavidac 



Genus GLAVA 



Glava parva, new species 

 Plate 1, Fig. 1 



Trophosome. — Solitary, scattered zooids arising from a thin encrus- 

 tation on a gastropod shell; no stolon showing superficially; zooids 

 small, 2 mm. high; tentacles about 20 in number, scattered, but leaving 

 a considerable portion around the mouth free. 



Gonosome. — Sporosacs in a single compact cluster, surrounding the 

 hydrocaulis immediately below the proximal tentacles. 



Distribution. — Jicarita Island, 30 fathoms. This is an unusual depth 

 in which to find Clava, which is commonly littoral. 



Genus GORYDENDRIUM 



PGorydendrium flabellatum, new species 

 Plate 1, Fig. 2 



Trophosome. — Colony coarse, flabellate, fascicled, 6 cm.; the irregu- 

 larly placed branches are much more slender than the main stem. The 

 coenosarc fills but a small portion of the perisarcal tubes, that go to 

 form the fascicle. The free portion of the tube that passes out to the 

 base of the hydranth is long and gradually curved outward from the 

 stem or branch. This tube is veiy coarse, 0.4 mm. in diameter. The 

 hvdranth is stout with 20-24 tentacles. 



