NO. 1 FRASER : HYDROIDS 67 



Plumularia sinuosa, new species 

 Plate 15, Fig. 77 



Trophosome. — Colony small, slender, 10-12 mm.; stem sinuous. The 

 distal end of each internode is furcate, one portion continues as the 

 next cauline internode and the other as a hydrocladium ; these alter- 

 nate from side to side. The hydrocladium consists of alternating non- 

 hydrothecate and hydrothecate internodes, the proximal, a short one, 

 being without a hydrotheca. The nonhydrothecate internode has a 

 transverse node proximally and an oblique node distally, the hydrothe- 

 cate internode, the reverse. The hydrotheca is deeply cup-shaped, cen- 

 trally placed, with its margin free from the surface of the internode. 

 On each cauline internode there is a nematophore at the angle of bifur- 

 cation, and one almost centrally placed on the side away from the 

 hydrocladium; there is no nematophore on the proximal hydrocladial 

 internode, but there is one on each of the other nonhydrothecate inter- 

 nodes; on each hydrothecate internode there is a nematophore proximal 

 to the hydrotheca and two nematophores overtopping the hydrotheca. 



Gonosome. — Not obsei'ved. 



Distribution. — Braithwaite Bay, 30 fathoms; Academy Bay, 17-22 

 fathoms. 



Genus SGHIZOTRIGHA 

 Schizotricha tenella (Verrill) 



Plumularia tenella Verrill, Invert. Vineyard Sound, 1874, p. 731. 

 Schizotricha tenella Nutting, Am. Hyd., Part I, 1900, p. 80. 



Distribution. — Jicaron Island, 25-30 fathoms; Isabel Island, 10-25 

 fathoms. 



Genus STREPTOGAULUS 

 Streptocaulus pulcherrimus Allman 



Streptocaulus pulcherrimus Allman, Challenger Hyd., I, 1883, p. 48. 



Nutting, Am. Hyd., Part I, 1900, p. 129. 



Distribution. — Between Charles and Indefatigable islands, 60 fath- 

 oms; off Post Office Bay, 70-80 fathoms; Gardner Bay, 25-35 fathoms. 



Some fine specimens of this species, hitherto recorded only from the 

 Cape de Verde Islands, are well provided with gonangia. The largest 

 colony, taken in Gardner Bay, has a length of 56 cm. 



