2 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 9I 



slender and lax, often again branched, giving a flaccid appearance to 

 the whole colony. Hydrothecae irregularly arranged, with long, slender 

 pedicels, somewhat geniculate at the origin, irregularly annulated ; 

 there are always annulations at the base of the hydrotheca ; they may 

 appear at any other place on the pedicel, but the pedicel is never 

 annulated throughout ; hydrothecae, 0.5 to 0.7 mm in length, regularly 

 campanulate, with eight rather sharp, deeply cut teeth on the margin. 



Gonosome. — Gonangia, 0.7 to 0.9 mm in length, extensively dis- 

 tributed, directly on the main fascicled stem, near the base of the 

 main branches, or in the axils of the smaller branches or pedicels ; 

 sessile, or almost so, smooth, oblong or slightly obovate, sometimes 

 narrowing slightly just below the rim. 



Holotype.— U.S.N. M. no. 43285. 



Distribution. — East coast of Haiti, lat. i9°io'35" N., long. 69° 

 2o'45" W. ; 15 fathoms. 



SYNTHECIUM GRACILE, n. sp. 



Plate I, fig. 2 



Troplwsomc. — Colony unbranched, 10 mm high ; inter nodes short, 

 divided by slightly oblique nodes ; one hydrotheca to each internode. 

 Hydrothecae alternate, adherent for about one-third of the length, 

 the basal portion gradually narrowing proximally ; distal portion turn- 

 ing outward at an angle of 35-40°, tubular. Length of hydrotheca, 

 0.5 to 0.6 mm, greatest diameter 0.2 mm. 



Gonosome. — Not observed. 



Holotype.— U.S. N.M. no. 43286. 



Distribution. — North of Puerto Rico, lat. i8°3o'3o" N., long. 66° 

 23'5" W. ; 40 fathoms. 



SERTULARELLA ORNATA, n. sp. 



Plate I, fig. 3 



Trophosome. — Stem simple, unbranched, 3 mm high or less, 

 slightly geniculate, divided into regular internodes by rather faint, 

 oblique nodes, each of which bears a hydrotheca ; hydrothecae alter- 

 nate, turned well outward, adnate for a very small portion at the 

 base, cylindrical, or narrowing slightly toward the distal end, with 

 characteristic, strongly crested, transverse rugosities, as many as 

 seven of them ; margin with four low but sharp teeth ; operculum of 

 four flaps. 



Gonosome. — Gonangia borne singly, just below the base of one of 

 the proximal hydrothecae, broadly oval, but somewhat distorted, with 



