AMERICAN HYDLiOlDS. 109 



It dift'ers from distans in the more robust and closely approximated hydrotheca', and in the num- 

 ber and form of the hydrothecse between tlie corbula and the stem. 



Type slides. Cat. Nos. 1866(!, 1S667, U.S.N.M.; Cat. No. 15373, Mus. State Univ. Iowa; also 

 in the collection of the author. 



THECOCARPUS BENEDICTI, new species. 

 (Plate XXV, figs. 3-5.) 



Trophosome. Hydrocaulus a sparsely branched fascicled stem, attaining a height of 12 to 15 

 inches; stem compressed, with knotty protuberances of contorted tubes on the portion which 

 aoes not bear hydrocladia; hydrodadia arising from the front of the stem, alternate, long and 

 straight (not sinuous as in ^L. distmis); divided regularly into internodes, each of which bears a 

 hydrotheca. Hydrotheca- large, stout, closely approximated for this group, with a single anterior 

 spine and several lateral shallow teeth or siuuatioiis on the margin; iutrathecal ridge slight, 

 dividing the lower third from the upper two-thirds of the hydrotheca; supracalycine nematophores 

 broad, reaching to the level of the top of the hydrotheca; there are two mesial nematophores, one 

 adnate to the front of the hydrotheca, and attaining the level of the iutrathecal ridge, the other 

 considerably shorter, forming a spur at the base of the first. 



Gonosome. Corbula- very large, borne on pinna 1 springing from the front of the stem, 

 directed forward, and bearing about five somewhat modified hydrotheca'. between the corbula and 

 the stem; corbula leaves entirely open, narrow, and widely separated, each bearing a modified 

 hydrotheca a little above its base, directed antero-laterally and with small supracalycine nemato- 

 phores; the distal portion of each leaf curved and bearing a row of nematophores on its distal 

 edge. Gonangia oval, borne at the bases of the leaves. These corbula- are the largest known to 

 me, being sometimes over half an inch long, composed of 25 or 30 pairs of leaves. 



Distribution. Albatross Station 2415, lat. N. 30 44', long. W. TO" 1 20', 440 fathoms; Station 

 2600, lat. N. 300 47/^ i ong . w. 79 49', 270 fathoms; Station 266S, lat. N. 30? 58', long. W. 79 38', 

 294 fathoms; Station 2671, lat. N. 31 20', long. W. 79 22', 280 fathoms; Station 2672, lat. N. 31 

 31', long. W. 79 05', 277 fathoms. 



This elegant species is very near A. bisjtinosns Allman, from which it may be distinguished by 

 its more robust and much more closely approximated hydrothecse, with less pronounced marginal 

 teeth. Named in honor of my friend, Dr. James E. Beuedict, of the D. S. National Museum. 



Type slides. Cat. Nos. 186(!8, 18669, U.S.N.M.; Gat. No. 15374, Mus. State Univ. Iowa; also 

 in the collection of the author. 



THECOCARPUS BISPINOSUS Allman. 



(Plate XXV, Jigs. 6-8.) 

 Aglaophenia binpinosa ALLMAN, Mem. Mus. Comp. Zool., 1877, V, No. 2, p. 46, pis. xxvn, xxvm. 



Trophosome. Stem attaining a height of 8 inches, stout, simple, rising from an entangled 

 mass of branching tubular filaments, fascicled below, and presenting from distance to distance 

 knot-like projections; pinna' (hydrocladia) alternate, attaining a length of nearly an inch and a 

 half. Hydrotheca- deep, widening upward; margin with a single, strong, tooth like process in 

 front, and with short, blunt teeth in the rest of its extent; intrathecal ridge not conspicuous. 

 Supracalycine nematophores stout, not overtopping the hydrotheca; mesial uematophores two in 

 number, the distal one adnate to the hydrotheca, along which it extends for about one-third of the 

 height of the hydrotheca, the proximal one forming a short, stout, spine-like process just below 

 the distal. 



Gonosome. Corbula' open, formed by two alternate or subopposite series of free, rib-like 

 processes, each of which carries near its base a small, hydrothecal cup, and along its dista. margin 

 a series of numerous tooth-like nematophores; the rachis of the corbula continued toward the 

 common stem as a long peduncle carrying about five unchanged hydrotheca'. 



Distribution. Oft' Alligator Iteef, Florida, 156 fathoms; oft' Tennessee Reef, Florida, I'OO 

 fathoms. 



I have not seen this species and the above description is copied entire from the original. 



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



