78 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 9i 



Of the 15 species considered 14 are described as new, and for the 

 fifteenth the gonosome is described and figured for the first time. As 

 indicated, one new genus and one new family are described. 



The whole collection, therefore, has provided one new family, two 

 new genera, 21 new species, and the gonosome of two species, of which 

 the trophosome had been previously described. 



I must again express my appreciation of the courtesy shown by the 

 United States National Museum in providing the opportunity to ex- 

 amine this material, and my appreciation of the contribution that 

 Miss Ursula Dale has made in drawing the figures used in illustration. 



SYMPLECTANEIDAE, new family 



Trofhoso7iie. — ^Zooids without chitinous perisarc, with capitate ten- 

 tacles, arranged in series over the surface of the body of the hydranth, 

 each series of three or more fused throughout much of their length 

 to form a bractlike structure. 



Gonosome. — Gonophores producing sporosacs borne on the body 

 of the hydranth. 



SYMPLECTANEA, new genus 



Trophosome. — ^Zooids solitary, without chitinous perisarc; the capi- 

 tate tentacles in series, graded in length, the longest tentacle medially 

 placed in the series and the others growing shorter as they appear 

 farther from the median. 



Gonosom^e. — Gonophores in the form of sporosacs in the axil of a 

 series of tentacles. 



SYMPLECTANEA BRACTEATA. new species 



Plate 13, Figxtke 1 



Trophosome. — Solitary zooids grow from a broad base, with stubby 

 processes projecting from the central portion; largest specimens 33 

 mm. in length ; hydrocaulus 1.6 mm. in diameter, hydranth 2.0 to 4.0 

 mm., the hydranth making up one-third of the length. No chitinous 

 covering in any part and no annulations. The hydranth is provided 

 with numerous tentacles in series, scattered over the whole surface; 

 the series consists of 3, 5, or 7 tentacles in a row, fused into one bractlike 

 structure ; the median tentacle may be 1 mm. long, the next two, one 

 on each side, much the same in length, which is less than that of the 

 median; there is a further recession for the next pair, and the next, 

 if these are all present. Fusion appears for the greater part of the 

 length of the lesser tentacle of each pair in succession, always leaving 

 the capitate portion free. In the younger hydranth the bract makes a 



