MUSEUM OF COMrARA-TIVE ZOOLOGY. 131 



Aglaophenia insignis, n. 8. 



A. insignis resembles A. gracilis more closely than it does any other species 

 of the genus. It dillers from it in that the mesial, adnate nematophore pro- 

 jects almost at right angles to its hydrotheca. This nematophore is not as 

 lon<^ as the mesial nematophore of A. ravnosa. The corbula is short and thick, 

 different in shape from that of A. rhijncocarpa and A. rigida. 



Trophosome : — Hydrocaulus three inches high, branching, non-fuscicled, with 

 nematophores on the stem. Hydrorhiza creeping. Branches spring from oppo- 

 site sides of main stem, but they are not exactly opposite in position of origin. 

 Hydrotheca) closely approximated, short, stout, with the margin toothed. Su- 

 pracalyciue nematophores rise slightly above the orifice of the hydrotheca. 

 Mesial nematophore adnate part of its length, and with the remainder extend- 

 ing at right angles to the surface of the hyelrotheca. Ultimate ramuli borne 

 on main stem as well as branches. 



Gonosome : — Corbula short, stout, closed, bearing a hydrotheca on the 

 peduncle. The nematophores borne on outer walls of the corbula in rows, with 

 each nematophore long, tubular, and tapering slightly to a terminal opening. 

 The number of nematophores in each row is six or seven on each side. Nimi- 

 ber of ribs, four and five. Peduncle of each corbula, short. 



Grenada, 262 fms. 



Aglaophenia gracilis, All. 



An Aglaophenia, which resembles A. gracilis in size and shape of hydrotheca, 

 has a corbula like that of A. rigida. The only differences which Allman points 

 out between these two species is that in A. gracilis " the hydrothecal intemodes 

 are longer and narrower" than in A. rigida, and A. rigida is a much "more 

 ramified and a taller form." Allman says of A. gracilis, " Gonosome wanting." 

 In the hydroid, which has been identified as A. gracilis, there is a corbula 

 which resembles that of A. rigida. A. gracilis and A. rigida may be the same 

 hydroid. 



Aglaophenia gracillima, n. s. 



Trophosome : — Hydrocaulus not branching, attaining a height of three 

 inches. Non-fascicled. Upper part of hydrocaulus. bearing denticle-like ne- 

 matophores. Pinnae alternate. Hydrotheca deep, swollen below ; margin 

 with a medially placed tooth longer than the remaining dentition about the 

 margin of the hydrotheca. A spur arises near the base of this tooth. Supra- 

 calycine nematophores slightly overtopping the margin of the hydrotlieca. 

 Mesial nematophore with two openings, one terminal ; the other on side facing 

 the hydrotheca. Hydrotheca; closely crowded together, each arising from a 

 joint of the pinna. 



Gonosome : — Corbula like that of yl. lophocarpa in shape and size, but the 

 distal end terminates bluntly in a single large nematophore, and not in a coni- 



