4 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 9I 



one at the end. The supracalycine nematophores are large, reaching 

 for nearly half their length above the margin of the hydrotheca. On 

 the regular, cauline internodes, there are two large cup-shaped 

 nematophores. 



Gonosome. — Not observed. 



Holotype.—U.S.l^M. no. 43289. 



Distribution. — North of Puerto Rico, lat. i8°27'35" N., long. 65° 

 33'35" W. ; 26 fathoms. 



AGLAOPHENIA MEGANEMA, n. sp. 



Plate I, fig. 6 



Trophosomc. — Colony rather minute, up to 15 mm, simple, un- 

 branched. The basal portion of the stem is divided into irregular 

 internodes by transverse nodes, but just below the first hydrocladium 

 it seems to have a distinct torsion, with two oblique nodes appear- 

 ing in the torsion. The hydrocladial portion of the stem is divided into 

 regular internodes by transverse nodes, each bearing a hydrocladium 

 from its face ; the hydrocladia alternate to one side and the other, but 

 the bases are not far from being in line ; the hydrocladia are short, 

 with as many as five hydrothecae, closely placed. The hydrotheca is 

 approximately two-thirds as wide as it is deep, almost completely 

 adherent, with seven rounded, nearly equal teeth on the margin, the 

 median tooth being slightly retrorse and slenderer than the others ; 

 there is a definite intrathecal ridge. The median nematophore is long, 

 sometimes overtopping the hydrotheca ; the supracalycine nemato- 

 phores are very pronounced, as they seem to pass right across the 

 hydrocladium to curve upward, reaching higher than the margin of 

 the hydrotheca. The cauline nematophores are of the regular, some- 

 what triangular type, one at the base of the hydrocladial process and 

 one near the proximal end of the internode. 



Gonosome. — -Not observed. 



Holotype. — U.S.N.M. no. 43290. 



Distribution. — North of Puerto Rico, lat. i8°24'3o" N., long. 65° 

 38'3o" W. ; 9 fathoms. 



ANTENNELLA CURVITHECA, n. sp. 



Plate 2, fig. 7 



Trophosomc. — Colony small and slender, 2.5 mm high, represent- 

 ing a single hydrocladium with 5 or 6 hydrothecae. The basal portion 

 has two or more transverse nodes with no nematophores on the inter- 



