AMERICAN HYDROIDS. 117 



downward from the bottom of the hydrotheca. Hydrotheca? closely approximated, rather short 

 for this genus, tubular, gradually increasing in size from below upward; anterior profile above 

 the mesial nematophore almost straight; margin perfectly smooth and level all the way around; 

 intrathecal ridge short, strong, curved sharply upward; supracalycine neuiatophores stout, over- 

 topping the hydrotheca; mesial nematophore short, spur-like, with the basal part adnate, and the 

 distal part closely approximated to the hydrotheca; a slight internal ridge crosses the nemato- 

 phore near its middle; cauliue nematophores numerous, there being apparently two rows to each 

 of the component tubes of the stem. 



(ronosomc. (lonangia oblong -ovate, with lunate subterminal apertures, borne on an unbranched 

 phylactogonium springing from the side of the base of the proximal hydrotheca of the hydro- 

 cladium. There are from one to five, usually two, gonangia on each phylactogouium. 



Distribution. Southwest from Cape Sable, Nova Scotia, 300 fathoms (Verrill); Albatross 

 Station 2474, lat. N. 44 '28', long. W. 57 11', 133 fathoms: A Ibatross Station 2479, lat.N. 44 06', 

 long. W. 57 17', 120 fathoms; Albatross Station 2666, lat. N. 30 48', long. W. 79 49', 270 

 fathoms; Albatross Station 2698, lat. N. 45 07', long. W. 55 09', 90 fathoms. 



This species resembles A/jlaophenia Integra G. O. Sars, ' so far as the shape of the hydrotheca? 

 is concerned, but the figure given by Sars indicates that his species has a row of hydrothec;b on 

 the anterior tube of the stem, and the gonaugia are represented as unprotected by phylactogonia. 



Type. In the Museum of Vale University. 



CLADOCARPUS CARINATUS, new species. 

 (Plate XXIX, figs. 3-7.) 



Trophosome. Colony branching in an irregularly alternate manner, flabellate, the branches 

 and brauchlets growing at right angles with the stem and branches from which they originate, 

 attaining a height of 10 to 12 inches; stem fascicled, the anterior tube bearing the hydrocladia; 

 hydrocladia alternate, lying in the same plane, rather closely approximated, sinuous, divided into 

 regular internodes, each of which has a very slight double curve corresponding roughly to the 

 sigmoid curve of the hydrotheca, and strong septal ridges, one near each end, three opposite the 

 hydrotheca, and one between the hydrotheca and the mesial uematophore. Ilydrotheca- having 

 the form of short tubes bent into a sigmoid outline, with a strong posterior intrathecal ridge 

 dividing the lower third from the upper two-thirds, and an anterior flexure below the strongly 

 everted margin; a thickened anterior ridge ends in a blunt-pointed keel on the middle of the 

 anterior face; aperture smooth, flexed forward so as to open almost directly in front; supra- 

 calycine uematophores rather long, tubular, slightly overtopping the hydrotheca, and having a 

 small, round, terminal opening; mesial nematophore widely separated from the hydrotheca, 

 rather short, slightly recurved, and with a constricted terminal aperture; cauliue nematophores 

 irregular in size, large ones on the bases of the hydrocladia, and on the proximal end of the front 

 of the stem joints; smaller ones at the distal ends of the stem joints. 



Gonosonic. Gonangia simple, very much lengthened, ovate sacs, borne at the bases of the 

 hydrocladia, and protected by stout phylactogonia, each with three short, flattened, almost 

 straight leaf-like branches, armed with a few uematophores along their distal edges. The 

 phylactogonia are so arranged that the two rows on opposite sides of the stems almost completely 

 inclose the gonangia. 



Distribution. Mbtr<ts Station 2415, lat. N. 30 44', long. W. 79 26'; depth, 440 fathoms; 

 Albatross Station 26(53, lat. N. 29 39', long. W. 79 49'; depth, 421 fathoms; Albatross Station 

 2667, lat, ]Sr. 30 53', long W. 79 43'; depth, 273 fathoms; Albatross Station 2668, lat. K 30 59', 

 long. W. 79 39'; depth, 294 fathoms. 



This is perhaps the most curious and aberrant Cladocarpxs found by the Albatross. Indeed, 

 its characters are so strongly marked that one is inclined to doubt that it can properly be placed 

 in that genus at all. In diagnostic features, however, it comes well within the generic definition 

 adopted in this work. 



Type. sliflef.Cut: Nos. 18685, 18686, U.S.N.M.; Cat. Nos. 15388, 15389, Mus. State Univ. Iowa; 

 also in the collection of the author. 



Kimdskuliun <nn Nm^vs Hydroider (1873), p. 12, pi. II. 



