150 PEOr. ALLMAN ON NEW IIYDBOIDA FROM 



unable to offer any suggestion as to the significance of this very 

 exceptional condition. Its position is nearly that of the intra- 

 thecal ridge in the 8tatoplean Plumularidse. 



Aglaophenia. 



Aglaophenta chalaeocarpa, n. sp. (PL XXI. figs. 1-4.) 



Tropliosoone. — Stem monosiphonic, simple, springing from a 

 tubular stolon at such short intervals as to form a dense tuft. 

 Hydrothecge rather wide, margin with nine teeth ; intrathecal 

 ridge distinct, passing quite round the hydrotheca ; mesial 

 nematophore adnate to about three fourths of the heiglit of the 

 hydrotheca, and then terminating in a free process which does not 

 extend beyond the level of the hydrotheca-margin ; lateral nema- 

 tophores strong, cylindrical, reaching the level of the hydrotheca- 

 margin. 



Gonosome. — Corbula rather short, with about eight pairs of 

 leaflets, which are but slightly adherent to one another, the rhachis 

 carrying a spur-like nematophore at the base of every leaflet ; 

 peduncle of corbula carrying a single hydrotheca. 



Locality. Caj)e of Good Hope. 



The species here described attains a height of about one inch, 

 and occurs in dense masses along with Sertularia aperta on one 

 of the olive-coloured seaweeds*, and is probably an inhabitant of 

 quite shallow water. The leaflets of the corbula are either quite 

 free, or slightly adherent to one another by their opposed edges 

 towards the base. 



Aglaophenia perforata, n. sp, (PI. XXL figs. 5-8.) 



Trophosome. — Stem simple, menosiphonic, springing at intervals 

 from a creeping stolon. Hydrothecae wide, margin Avith about 

 five teeth on either side, and a single mesial tooth in front ; intra- 

 thecal ridge strong, transverse, situated at the junction of the 

 middle and posterior third of the hydrotheca; mesial nemato- 

 phore adnate to about the posterior third of the hydrotheca, and 

 then terminating in a short free process whicli is separated from 

 the adnate portion by an imperfect septum ; lateral nematophores 

 scarcely overtopping the hydrotheca. 



Gonosome.. — Corbula closed, deep and rather short, with about 

 nine pairs of costae ; sutures of costsB with a wide aperture 

 between every two denticles ; peduncle short, carrying a single 

 hydrotheca. 



Locality. St. Vincent Islands. 



