Hydrothecir distant and vr 

 Hydrocladia strongly sinuo 



AMERICAN HYDEOIDS. Ill 



rv slender f Hydrotheea almost tubular C.dolichotJirra. 



' < Hydrothecii' long, obconic C.flejcuosus. 



[ Hydrothecii- with anterior profile strongly concave ('. (CM HIS. 



f Upper part of stem flattened, bandlike C. grandis. 



an- ) 1" 



Hydrotheca' with two large, shallow an- ) Upper part of stem not strongly flattened, no lateral marginal teeth 

 terior teeth. l f.'.paniflisea. 



[ Shallow lateral marginal teeth C. uperlosus. 



Hydrotheca; without teeth.. | Apertiuv of hydrothec:.- directed upward . . ..Cpourtalesii, 



I Aperture ol hydrotheose directed forward C. cannatus. 



CLADOCARPUS SIGMA (Allman). 



(Plate XXVI, figs. 1, 2.) 

 Aylaoplicnia sigma ALLMAN, Mem. Mus. Comp. Zool.. 1877, V, No. 2, p. 45, pi. xxvi. 



Trophosome. Colony profusely and repeatedly branching, attaining a height of nearly 2 

 feet; stem fascicled except at the extreme tips of the branches; hydrocladia alternate, rather 

 closely set, having their origin from the front of the stem; internodes straight, each having its 

 axial cavity divided by about ten very strong and conspicuous septal ridges, which appear to 

 extend entirely around the internal surface of the interuode. Hydrotheca? rather closely approx- 

 imated for this group, deep, cylindrical, with margins very slightly flaring, and armed with about 

 ten shallow, rounded teeth of nearly the same size; intrathecal ridge conspicuous, with a sigmoid 

 flexure in lateral view, the course being forward, bending gracefully upward, and then forward, 

 downward, and forward again; supracalycine nematophores cylindrical, reaching the margin of 

 the hydrotheca; mesial nematophore small, spurlike, adnate except at the distal end; cauliue 

 nematophores as usual in this genus. 



Gonosome. 1 Gonangia borne on phylactogouia, springing from the proximal iuternode of the 

 hydrocladia, ovate, with a lunate, latero-terminal orifice. Each phylactogouium bears two or three 

 gonangia, and several uematophorous branchlets which loosely embrace the gonangia. 



Distribution. Off Alligator Reef, Florida, 110 fathoms; Albatross Station 2416, lat. N. 31 

 20', long.'W. 79 07', 271! fathoms; Albatroxs Station 2667, lat. N. 30 53', long. W. 79 43', 273 

 fathoms; Albatross Station 2668, lat. N. 30 58', long. VV. 70 39', 294 fathoms; Albatross Station 

 2669, lat. N. 31 09', long. W. 7!) 34', 352 fathoms: Albatross Station 2608, lat. N. 34 26', long. 

 W. 76 12', 22 fathoms; off Sand Key, Florida, 116 fathoms; State University of Iowa expedition. 



This species was originally described by Professor Allman from an imperfect specimen 

 without gonosome. Specimens dredged by the Bahama expedition from the State University of 

 Iowa are among the most graceful and largest plumularians known. One in particular reaches a 

 height of nearly two feet, and has a dense cluster of gracefully disposed branches, forming an 

 exceedingly handsome colony. 



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



CLADOCARPUS COMPRESSUS Fewkes. 



(Plate XXVI, ligs. 3-5.) 

 Cladoi-arpus compressus FEWKES, Bull. Mus. Comp. Zool., 1881, VIII, No. 7, p. 135. 



Trophosome. 2 Colony unbranched, attaining a height of about 8 inches; stem not fascicled 

 and without distinct nodes; hydrocladia rather closely approximated, divided into regular inter- 

 nodes, each of which has its cavity partly divided by two strong septal ridges back of the hydro- 

 theca, and a very slight one under the supracalycine nematophores. Hydrotheca deep, with its 

 lower portion suddenly constricted by a prolongation inward of the septal ridge, forming a very 

 broad and short intrathecal ridge; margin armed with nine large, conspicuous, rounded teeth; 

 anterior profile nearly straight; supracalyciue nematophores small, reaching the top of the hydro- 

 theca; mesial nematophore short and spurlike, the distal end free; a cauline nematophore on each 

 side of the base of each hydrocladium, and another between these; there is a row of denticulate 

 nematophores along the front of the stem below the hydrocladia. 



Qonotsome. Gonaugia oblong, obovate, with obliquely truncated ends or apertures, borne in 

 great numbers along the front of the stem, and protected by three-pronged phylactogonia. 



Locality. Off St. Vincent; Blake Station 224 ; depth, 114 fathoms. 



'Hitherto uudescribed. 



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



