40 AGLAOPHEXIA RHYNCHOCARPA. 



strongly marked septal ridge on a level with the intrathecal ridge, and 

 with a less distinct one at the base of the snpracalycine nematophores. 

 HydrothecaB deep, with strongly dentate oblique margin, and with the 

 intrathecal ridge extending obliquely upwards across the entire width of 

 the hydrotheca. Snpracalycine nematophores strong, overtopping the 

 hydrotheca ; mesial nematophore attaining nearly the level of the margin 

 of the hydrotheca, and adnate to it for nearly its entire height ; cauline 

 nematophores forming a longitudinal series on front of the stem. 

 Gonosome not known. 



Florida Reef, from a depth of from 2 to 3 fathoms. 



This is a tall-growing species, with a loose, somewhat straggling habit. 

 In the absence of all knowledge of the gonosome, its reference to Aglao- 

 phenia is only provisional. 



Aglaophenia rhynchocarpa. 

 PL XXIII. Figs. 5-8. 



Trophosome. — Hydrocaulus attaining a height of about two inches, 

 non-fascicled, simple, springing in dense plumose tufts from a network 

 of tubular fibres; internodes of pinnae divided transversely by three or four 

 strongly marked imperfect septa. Hydrothecre incurved in front, margin 

 deeply dentate with the anterior tooth strong and bifid ; intrathecal ridge 

 well marked, stretching obliquely upwards across the entire width of the 

 hydrotheca. Snpracalycine nematophores slightly overtopping tlie margin 

 of the hydrotheca; mesial nematophore adnate for nearly its entire length 

 to somewhat less than the proximal half of the hydrotheca. 



Gonosome. — Corbula"! closed, with the rachis continued beyond the distal 

 end in the form of a beak ; leaflets each with a strong process at its base 

 directed outwards and . iwards the distal end of the corbula; nematophoral 

 ridges not rising in p.'ominent crests. 



Key West, Triangle Shoal, 3 to 4 fathoms. 



This is a very beautiful species, and presents several well-marked char- 

 acters. The hydrothecje are rendered striking by their rather prominent 

 base giving rise to a sinus-like depression of the anterior wall, and by 

 the bifid anterior tooth of the margin. It is, however, in the corbula that 

 the most marked characters are to be found. The prominent beak-like 

 distal exten.sion of the rachis forms a striking feature, while the processes 



