74 AMERICAN HYDKOIDS. 



alternate manner, especially on the distal part of eacb branch, hut usually scattered more or less 

 over the branches; two or three proximal hydrocladial internodes without hydrothec;i', the 

 remainder being long and hydrothecate, with only an occasional short intermediate internode. 

 Hydrotheca' distant, small, shallow, cup-shaped, and usually borne on the distal portion of a long 

 internode, but the proximal hydrotheca may be below the middle of its internode; snpracalyeine 

 nematophores present, two mesial uematopkores below the hydrotheca on each long internode; a 

 cauline nematophore in the axil of each hydrocladium. 



Gonoxomc. Gonaugia ovate, borne singly near the axils of the hydrocladia. 



Distribution. Albntrosx Station 2:!2L', lat. X. 23 11', long. W. 82 18'; depth, 115 fathoms. 



This species is ]iecnliar in having the distant hydrothecse borne on the distal ends of the long 

 slender internodes. 



Typr .W/rMv. Cat. Nos. 1S569, 1S570, U.S.N..M.; Cut. Nos. 1 10S4, HCiSli, Mus. State Univ. Iowa; 

 also in the collection of the author. 



ANTENNOPSIS LONGICORNA, new species, 

 il'latr XII, li.^s. ::,4.) 



Tropho/tomc. Colony of incomplete specimen attaining a height of about 2 inches, branching 

 in a dendritic manner, color of main stem and branches black; stem and main branches fascicled; 

 hydrocladia-bearing branches not fascicled, except proximally, divided into irregular internodes 

 and bearing hydroeladiaon very long processes, usually from theirdistal ends ; hydrocladia scattered, 

 with a tendency toward a pinnate arrangement, slender; proximal internode long and slender, 

 bearing a hydrotheca on its proximal portion, the remainder of the hydrocladia being made up of 

 alternate long hydrothecate and short intermediate internodes with very distinct nodes. Hydro 

 thecai distant, shallow, cup-shaped, situated on the proximal portions of the long internodes; 

 supracalycine nematophores present, one mesial nematophore to each internode; a pair of cauline 

 nematophores in the axil of each hydrocladium, and occasionally one on the distal part of the long 

 projection which bears the hydrocladium. 



GoiioNUHU'. Not known. 



Distribution. Albatross Station 23.35, lat. X. 23 11', long. W. 81T I'd'; depth, 204 fathoms. 



This species is very near A. niyra and may be identical with it, but the very long processes 

 from the stem seem to constitute a perfectly constant character, as does the position of the hydro- 

 thecie on the proximal portions of the long internodes. There seems to be a tendency on the part 

 of the hydrocladia to break off at the end of the long process from the stem. On one branch of a 

 specimen before me the hydrocladia are all broken off in this way, leaving the stem with the 

 processes well displayed, resembling somewhat the gonosome of Hippurella lonyicarpa. 



TI/I>,' slides. Gat. Nos. 18303, 183G4, 18365, 183GG, U.S.N.M.; Cat. Nos. 11087, 11088, Mus. State 

 Univ. Iowa; also in the collection of the author. 



ANTENNOPSIS NIGRA, new species. 

 (Plate XII, figs. 5,6.) 



Trnpliosome. Colony attaining a height of 5i inches, branching in a dendritic manner; stem 

 and main branches very dark brown or black, the latter strongly geniculate, giving off hydro- 

 cladia bearing branchlets at the geniculations ; main stem and branches strongly fascicled; hydro- 

 cladia scattered, very slender, supported on long processes of the branches; proximal internode 

 sometimes with a hydrotheca near its middle, but usually short and non hydrothecate, the 

 remainder of the hydrocladium being composed of alternating hydrothecate and intermediate 

 internodes, the former being the longer. Hydrotheca' distant, borne near the middle of the 

 internodes, quite shallow, cup shaped, much wider than deep; supracalycine nematophores 

 present, a mesial nematophore below the base of each hydrotheca, and one on each intermediate 

 internode; two cauline nematophores in the axil of each hydrocladium, where there is also a small 

 conical process, which may be a modified nematophore. 



Goiiosonie. Not known. 



Distribution. Albatross Station 2330, lat. N. 23 11', long. \V. si'o 19' ; depth, 121 fathoms. 



