134 PROF. ALLMAN ON NEW HTDEOIDA FEOM 



are emitted on all sides very numerous monosiplionic twigs which 

 carry the ultimate, pinnately disposed, alternate ramuli, whose 

 internodes are short and thick, separated from one another by 

 oblique joints, and each carrying a single hydrotheca. Hydro- 

 thecse deejD, free for about two thirds of their height, and nar- 

 rowing towards the orifice, which is cut into four rather short 

 and wide teeth. 



Gonosome. — Gonangia elongated, oval, springing each from a 

 point near the middle of an internode, narrowing towards the 

 summit, which is occupied by a circular 4-toothed orifice, and 

 gradually tapering below to the point of attachment. 



Locality. Cape of Good Hope. 



The species is remarkable for its thick polysiphonic stem 

 and short thick internodes. The specimen had a height of about 

 3 inches, and the stem measured nearly two tenths of an inch in 

 thickness towards its proximal end. 



Seetulaeella cuneata, n. sp. (PI. IX. figs. 1, 2.) 



TropJiosome. — Main stem fascicled, much branched ; branches 

 monosiphonic, pinnate ; pinnae alternate, rather distant. Hydro- 

 thecse closely set, springing singly each from a short, thick, wedge- 

 shaped internode, to which they are adnate for about half their 

 height, much contracted towards the orifice, which is circular and 

 entire. 



Gonosome. — Gonangia large, ovoid, much elongated, with shal- 

 low transverse corrugations but no true annulation, contracted 

 towards the summit, which opens by a 4-toothed circular orifice_ 



Locality. Cape of Good Hope. 



The short, thick, wedge-shaped internodes, and the long gon- 

 angia, which attain the length of about ten internodes of the 

 pinnse, are striking features in this hydroid. The hydrorhizal 

 end of the specimen had not been preserved. What remained 

 of the colony had a height of about 3 inches. 



Seetuiaeella limbata, n. sp. (PI. IX. figs. 3, 4.) 



TropJiosome. — Stem springing from a creeping fibre, monosi- 

 phonic, simple. Hydrothecse borne directly by the stem, each 

 springing from a short internode, and all directed towards one 

 side, free for about two thirds of their height, deep, narrowed 

 towards the summit ; margin of orifice produced into a broad, 

 thin, membranous rim which is emarginate at the epicauline side. 



Gonosome. — Gonangia springing each from a point just below 

 a hydrotheca, nearly globular, with a few shallow transverse 



