AGLAOPHENIA RIGIDA. 43 



situated near the bottom of the hydrotheca. Supracalycuie nemato- 

 phores scarcely overtopping the hydrotlieca ; mesial nematophore adnate 

 to less than half the height of the hydrotheca, and with a short, free 

 extremity ; cauline nematophores two on front of each internode of the 

 stem, one of these close to the axil of the pinna, and the other near to 

 the proximal end of the internode. 

 Gonosome not known. 



Off Carysfort Reef, from a depth of 52 fathoms. 



This species comes very near to Aglaophenia rigida in the form of 

 its hydrothecte. The hydrothecal internodes, however, are longer and 

 narrower than in that species. A. rigida, moreover, is a much more 

 I'amified and a taller form. 



Aglaopbenia rigida. 

 PL XXV. Figs. 5-9. 



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

 springing from a mass of tortuous filaments, non-fascicled, slender, wiry, 

 much branched towards the distal ends of the stems ; branches given 

 off from a point on the anterior side of the stem, from which they 

 frequently spring in pairs ; plnniB alternate, springing from a point 

 a little below the distal end of each internode ; hydrothecal inter- 

 nodes short, each with two short septal ridges. Hydrothecae closely set, 

 deep, slightly widening towards the orifice, and with strongly toothed 

 margin. Supracalycine nematophores slightly overtopping the hj^dro- 

 theca ; mesial nematophore adnate to about half the height of the 

 hydrotheca and terminating in a short, free extremity. 



Gonosome. — Corbulte completely closed, long, nearly cylindrical, with 

 about fourteen ridges rising into slightly prominent crests ; denticles of 

 ridges cup-shaped, with the basal one in the form of a tubular diver- 

 gent spur. 



Off Cape Fear, from a depth of 9 fathoms. 



The pinnae appear to be easily detached in this species, for most of 

 the specimens were nearly destitute of them, and presented little more 

 than a cluster of long, naked, wiry stems. 



The ramification is peculiar, the branches springing from the anterior 

 side of the stem, where each is usually accompanied by a second from 



