NO. 4 FRASER : HYDROIDS 13 



nate, the proximal being thecate. The hydrotheca is placed near the 

 middle of the internode; each node is flanked on each side by a well 

 marked septum. Besides the supracalycine nematophores, there is a 

 single, mesial nematophore on each internode. On the cauline process 

 there is a pseudonematophore, with a nematophore proximal, and one 

 distal, to it ; there is a cauline nematophore opposite the cauline process. 



Gonosome. — Not observed. 



Distribution. — Station A18-39. 8 miles southwest of San Nicolaas 

 Bay, Aruba Island, 23-24 fathoms. 



Remarks. — Five species of Antennopsis have been reported from the 

 western Atlantic but A. sinuosa is not veiy close to any of them. It has 

 more in common with A. annulate (Allman) than with any of the others. 

 As in A. annulata, the stem is pinnately branched proximally, while extra 

 branches are introduced distally. The sinuosity of the stem is a special 

 feature. Both are strongly fascicled in stem and primary branches. The 

 hydrocladial process is not so long and there is no athecate internode 

 proximal to the first thecate. The thecate and athecate internodes alter- 

 nate in the same way and have somewhat the same relative lengths. The 

 internode is similarly provided with well marked septa. The most strik- 

 ing difference is in the hydrotheca, its position and shape. While in 

 A. sinuosa the position of the hydrotheca is typically near the distal end 

 and the shape of the hydrotheca is typically plumularian, in A. annulata, 

 it is placed near the proximal node and is at least twice as deep as wide. 

 This would suggest that A. sinuosa is the older species. The differences 

 are too great to indicate close relationship. 



Genus GALLICARPA 

 Gallicarpa chazaliei Versluys 



Callicarpa chazaliei Versluys, Mem. Soc. Zool., France, 1899, p. 44. 



Fraser, Atlantic Hyd., 1944, p. 327. 



Distribution. — 7 miles north of Margarita Island, 17-22 fathoms. 

 The only previous record was near the Dry Tortugas, Florida. 



Genus PLUMULARIA 

 Plumularia diaphana ( Heller) 



Anisocalyx diaphana Heller, Adriatic Hyd., 1868, p. 42. 

 Plumularia diaphana Fraser, Atlantic Hyd., 1944, p. 348. 



Distribution. — 8 miles southwest of San Nicolaas Bay, Aruba Island, 

 23-24 fathoms ; Buccoo Bay, Tobago Island, shore, coral reef. 



