i)2 AMERICAN HYDROIDS. 



AGLAOPHENIA DUBIA ' Nutting. 

 (Plat.- XVIII, lig. .->.) 



Aglaoplienia gracili* ALLMAN, Mem. Mus. romp. Zool. 1S77, \ . No. L', p. 42, pi. xxv. 

 Aghiojilifiiin i/racilin < 'i.Ai'.KK, Hull. Mus. C'omp. Zool., 1879, V, No. 10, p. 24 s. 

 Aglaoplieniii yraviUs FKWKKS, Bull. Mus. Coin]). Zool., 1881, VIII, No. 7, p. 1!!1. 



Trophosome. Colony sparingly brant-lied, attaining a height of 4 inches; stein riot fascicled, 

 divided into regular internodes, each of which bears a hydrocladium on a process from near its 

 distal end ; liydrocladia divided into regular internodes, each of which bears a hydrotheca and has 

 its cavity partially divided by two incomplete internal septa, one being opposite the intrathecjil 

 ridge and the other below the base of the siipracalycine nematophores. Hydrothee;e rather stout, 

 slightly separated, with the anterior profile concave and about eight deeply cut teeth around the 

 margin; iutrathecal ridge well marked but short; siipracalycine uematophores barely overtopping 

 the hydrotheca : mesial nematophore stout, with its distal part widely separated from the hydro- 

 theca and its end reaching to about the middle of the height of the latter; two cauliue nemato- 

 phores on the front of each internode of the stem, and another small one at the base of each 

 hydrocladium. 



Gonosome. Not known. 



Distribution. Off Carysfort lieef; depth, 52 fathoms; i:/Lr, West Indies; depth, 37 fath- 

 oms (Clarke); lilake, Martinique; depth, 90 fathoms (Fewkes); Albatross Station 2411, lat. N. 

 2Go 34/ ? i ()11 g. w. 83 10'; depth, 27 fathoms; Albatross Station 2413, hit, N. 20'-', long. W. 82 58', 

 24 fathoms; State University of Iowa Expedition, Stations 51-52, or?' Florida Keys, 100 fathoms; 

 State University of Iowa Expedition, Station 12, off llabana, 150 fathoms; State University of 

 Iowa Expedition, Station 72, off Little Cat Island, fathoms. 



Type. lu the Museum of Comparative Zoology, Cambridge, Massachusetts, labeled Aylao- 



ia yracilis Allman. 



AGLAOPHENIA LOPHOCARPA Allman. 



(Pinto XVIII, figs. Ct-8.) 

 AylaopJtenia Jopliomrpa ALLMAN, Mem. Mus. C'omp. Zool., V, No. 2, p. 41, pi. xxiv. 



Tropliosotin: Colony usually unbranched, sometimes branching freely, attaining a height of 

 8 inches; stem uot fascicled, divided into rather long internodes, each of which bears a hydro- 

 cladium on a projection from near its distal end; hydrocladia somewhat distant for this genus, 

 divided into regular internodes, without internal septal ridges, except slight indications opposite 

 the iutrathecal ridge and below the supracalycine nematophore, Hydrothecic about twice as 

 deep as wide; anterior profile convex, aperture at right angles to the stem, armed with nine large, 

 equal teeth; iutrathecal ridge oblique, reaching about halfway around the hydrotheca; supra- 

 calycine nematophores reaching a little above the margin of the hydrotheca; mesial nematophore 

 extensively adnate to the hydrotheca, only the terminal portion being free and not reaching the 

 level of the middle of the hydrotheca; two cauline nematophores on each internode of the stem, 

 one near each end on the anterior aspect. 



(ioiiosomi: Corbula composed of about ten pairs of leaves, each of which has its distal edge 

 greatly expanded, projecting forward and upward, and armed with a row of nematophores and a 

 short spur-like projection at its base; a single hydrotheca between the corbula and the stem. 



Distribution. Dry Tortugas; depth, OS fathoms; Albatross Station 2383, lat. N. 28 32', long. 

 W. 88 (>'; depth, 1,181 fathoms; Albatross Station 2387, lat. N.29 21', long. W. 88 4'; depth, 32 

 fathoms; Albatross Station 2389, lat. N. 29 28', long. W. 87 50'; depth, 27 fathoms; Albatross 

 Station 2410, lat. N. 26 47', long. W. 83 25'; depth, 28 fathoms; Albatross Station 2413, lat, N. 

 20, long. W. 82 57'; depth, 24 fathoms; off Habana, Cuba, 200 fathoms, State University of 

 Iowa Expedition. 



Specimens from Stations 2387 and 2389 attain a height of 7 or 8 inches, and are straggling 

 and freely branched. The trophosome agrees in other respects with this species, but none of the 



' Name Aglaopltcuia yructlis preoccupied by Lamouroux, Histoire <los Polypici.s ( 'oralligones llexibles, 1816, p. 171. 



