94 AMERICAN HYDROIDS. 



This beautiful species is easily distinguished from its nearest allies, A. upm-arpa and A. lopho- 

 carpa, by the closer approximation of the liydrotheca', the much larger and more branching 

 colonies, and the very distinct and graceful corbuhc, which differ materially from those of any 

 other known species. 



Type slides. Cat. No. 15353, Mus. State Univ. Iowa; Cat. No. 1SG44, U.S.N.M.; also in the 

 collection of the author. 



AGLAOPHENIA ELEGANS, new species. 

 (Plate XIX, figs. 3,4.) 



Trophosome. Colony unbranched, growing in loose tufts from a creeping root-stalk and attain- 

 ing a height of about 4 inches; stem not fascicled, divided into regular iuternodes, each of which 

 bears a hydrocladium on a process near its distal end; hydrocladia alternate, rather distant, 

 divided into slightly flexuous iuternodes, each of which is itself divided by an internal septal 

 ridge opposite the intrathecal ridge. Hydrotheca- rather closely approximated, deep, tubular, the 

 anterior profile slightly concave, aperture nearly horizontal, margin armed with about seven 

 moderately sharp teeth; iutrathecal ridge short, oblique, supracalyciue nematophores small, 

 slightly overtopping the liydrotheca; mesial nematophore short, adnate, except the distal end, 

 which does not attain the level of the middle of the liydrotheca; two cauline nematophores on the 

 front of each interuode of the stem, and a perforated process at the base of each hydrocladium. 



Gonoxomc. (louangia borne near the distal ends of the stems, strongly arched and composed 

 of about fifteen pairs of broad, strongly imbricating leaves, each of which has a row of nemato- 

 phores along its distal edge; one or more of the proximal leaves is detached from the others and 

 hangs outward and downward over the rachis. There is a single hydrotheca between the corbula 

 and the stem; pedicel short. 



Distribution. Station 02, off Sand Key, Florida, 70 to 80 fathoms, State University of Iowa 

 Expedition. 



This species greatly resembles A. lophocurpn and A. apocarpa, especially the latter. The 

 hydrocladia are flexuous as in apocarpn, but the hydrothecu- are decidedly more closely approxi- 

 mated. The gonosome is quite distinct from that of any of its allies, being arcuate in outline and 

 having the loose, basal leaf as in ,1. tiilinlifcrn Ilincks. 



Type slides. Cat. No. 15354, Mus. State Univ. Iowa; Cat. No. 18645, U.S.N.M.; also in the 

 collection of the author. 



AGLAOPHENIA INSIGNIS Fewkes. 



(Plate XIX, figs. 5-7.) 

 Jglaopiienia iniignia Fewkes, Bull. Mns. Comp. Zool., 1881, VIII, No. 7, p. 131. 



Trophosome. 1 Colony growing from a woody rootstalk, subpinnately branched and attaining 

 a height of about, 3 inches; stem not fascicled divided into regular iuternodes, each of which 

 bears a hydrocladium on a process from near its middle; hydrocladia moderately approximated, 

 divided into regular internodes, each of which has a very strong horizontal ridge opposite the 

 intrathecal ridge. Hydrothecu- rather closely approximated, deep, with anterior profile concave; 

 aperture oblique, armed with seven prominent teeth; iutrathecal ridge low, short, horizontal; 

 supracalycine nematophores small, not attaining the level of the top of the hydrotheca; mesial 

 nematophore large, long, spur like, directed at right angles from the hydrocladium, distal free 

 portiou nearly as long as the hydrotheca is wide; cauline nematophores usually two to each inter- 

 node of the stem, besides a perforated process at the base of each hydrocladium. 



Gonosome. Corbnliu small, robust, composed of five pairs of broad leaves, the distal edges of 

 which form elevated crests, armed with very large tubular nematophores. 



Distribution. Blake Station 249, off Grenada; depth, 262 fathoms. 



At first sight the trophosome of this species closely resembles that of A. aperta. Upon 

 directly comparing specimens, however, I find that the hydrothecie of A. insignia are very much 

 smaller than those of A. aperta. The mesial nematophore of the former is proportionately heavier 



'Description of Doctor Fewkes's type specimen from the Museum of Comparative Zoology. 



