70 AMERICAN HYDKOIDS. 



Gonosome. Gonangia ovate, borne singly in tlie axils of the hydrocladia. 



Distribution. Albatross Station 2014, lat. N. 36 41', long. W. 74 39'; depth, 373 fathoms; 

 Albatross .Station 2205, lat. N. 37 08', long. VV. 74 .3(5', 58 fathoms; Albatross Station 2208, 

 lat. N. 35 11', long. W. 75 00', 08 fathoms; Albatross Station 2592, lat. N. 35 03', long. W. 

 75 12', 120 fathoms. 



This species is evidently very closely allied to A. antenninn, bat the character italicised above 

 appears constant, and this, together with the fact of its being from deeper water, seems to warrant 

 its separation. The arrangement of the hydrocladial internodes is also different, but this is an 

 exceedingly variable character, as already intimated. 



Type slides. Gut. Nos. 18553, 18554, U.S.N.M.; Cat. Nos. 11690, 11697, Mus. State Univ. Iowa; 

 also in the collection of the author. 



ANTENNULARIA SIMPLEX Allman. 



(Plate IX, fig. 5.) 

 Anteniiutaria nimptcj- ALLMAN, Mem. Mus. Com]). Zool., 1S77, V, No. 2, p. 34, pi. xxi. 



Trophoxome. Colony attaining a height of about 5 inches, simple, or very sparsely branched; 

 stem, with canaliculated cu-nosarc, bearing verticils of liydrocladia on strong processes; hydro- 

 cladia arranged in verticils of three to five each, and divided into internodes, each of which bears 

 a hydrotheca near its proximal end, an occasional intermediate inter-node being found on the distal 

 portions of the liydrocladia. Hydrotheca- rather small, cup-shaped, with slightly everted margins, 

 placed on the lower ends of the internodes; supracalycine nematophores large, as long as the 

 hydrotheca', borne on processes from the interuode; mesial nematophores large, two to each 

 internode, one being above and the other below the hydrotheca; cauline nematophores scattered 

 over the stem. 



Gonosome. Gonangia rather small, ovate, witli an oblique aperture, borne in the axils of the 

 liydrocladia. 



Distribution. Off Alligator Reef; depth, 8(5 fathoms (Pourtales); Albatross Station 2205, 

 lat, N. 37 08', long. W. 74 3(5', 70 fathoms; Albatross Station 2014, lat. N. 3(5 41', long. W. 74 

 39', 373 fathoms; Albatross Station 2209, lat. N. 35 13', long. W. 75 05', 48 fathoms; Albatross 

 Station 2342, lat N. 23 11', long. W. 82 20', 201 fathoms; Albatross Station 2592, lat. N. 35 

 02', long. W. 75 12', 120 fathoms; State University of Iowa expedition, Pourtales Plateau, 70 

 to 80 fathoms. 



This species is closely allied to A. ramosa, but differs in being generally simple, not branched, 

 and in having a much less number of liydrocladia to each verticil. Some specimens appear at 

 first sight to have the liydrocladia pinnate and opposite, but as a rule there are three to five 

 hydrocladia arranged in verticils as described above. 



Type. In the Museum of Comparative Zoology, Cambridge, Massachusetts. 



ANTENNULARIA RUGOSA, new species. 

 (Plate X, figs. 1, 2.) 



Trophosome. Colony attaining a height of inches, unbranched; stem with canaliculated 

 cosnosarc and bearing liydrocladia in closely set verticils of six or eight; hydrocladia borne 

 on stout processes of the stem, swollen at the proximal end and having their lower sides reenforced 

 by a remarkable thickening of the perisarc; internodes very long and irregular, sometimes bearing- 

 more than one hydrotheca, divided by sharply marked internodes. with their cavities partially 

 divided by numerous and irregularly disposed chitinous septal ridges or thickenings, which often 

 resemble nodal joints, thus imparting an appearance of many internodes, where in reality there is 

 only one. Hydrotheca' rather small, short, cylindrical, with the postero-lateral margins often cut 

 away, and supported below by a noticeable thickening of the internode; supracalycine nemato- 

 phores present; two or three mesial nematophores between adjacent hydrothecoi; cauline nernato- 

 phores scattered rather sparsely over the stem. 



Gonosome. Not known. 



