THE I'LUMULARID.E. 77 



ANTENNELLA GRACILIS Allman. 



(Plate XIII, fig. 5. ) 

 Antennella grariUs ALLMAN, Mom. Mns. Conip. Zool., 1877, V, No. 2, p. 3s, pi. xxn. 



Trophosome. Colony attaining a height of about 1 inch; stem absent ; hydrocladia springing 

 directly from the root stalk, divided into alternating hydrothecate and intermediate internndes, 

 the former being slightly the longer aud separated from the internodes below by a distinct 

 oblique node, and from the internodes above by an indistinct straight node. Hydrotheca' deep, 

 cylindrical, with margins not everted; supracalyeine nematophores borne on long processes 

 from the internode, which reach to the middle of the side of the hydrotlieca; the nematopliores 

 themselves scarcely reach the top of the hydrotlieca; mesial nematophores, one above and one 

 below each hydrotheca and two on each intervening interuode. 



Goitoxoiitt'. Not kuo\vn. 



Distribution. Off Gary sfort Reef (Ponrtales); depth, GO fathoms; AIbtitntx Station 2<i07, 

 lat. N. 34 38', long. W. 7G 12'; depth, 18 fathoms; State University of Iowa, Bahama expedi- 

 tion, near Habaua; depth, 150 to 2.50 fathoms. 



CALVINIA, new genus. 1 



Trophosome. Colony pinnately branching; stem fascicled; hydrocladia divided into regular 

 internodes, each bearing a hydrotheca; a small, apparently aborted cauline hydrotheca in the axil 

 of each hydrocladium, all of the remaining hydrotheca- protected by jointed nematophorous 

 branches springing from their bases. 



(ionoxonic. Gonangia ovate, sac-shaped, springing from the side of the proximal nemato- 

 phorous branch on each hydrocladium. 



This very striking generic form is entirely distinct from any other Elentheroplean plumu- 

 lariaus. A number of other genera have nematophorous branches for the protection of the 

 gonangia, but this is the only form that has produced a nematophorous branch for the protection 

 of each hydrotheca. The homology of these strange structures is hard to explain. They do not 

 seem to be highly specialized mesial nernatophores, for there is still remaining an ordinary mesial 

 nematophore below the base of each hydrotheca. Among the Statoplea, Hnlicornnritt ramulifn-n 

 Allman. a species dredged by the Porcupine, has practically the same arrangement, while the 

 genus Aglaophenopsis Fewkes has a single-jointed and usually unbranched uematophorous 

 ramulns at the base of the proximal hydrotheca of each hydrocladium. 



CALVINIA MIRABILIS, new species. 

 (Plate XIV, ligs. 1-3.) 



Trophosome. Colony attaining a height of 12 to 14 inches, tlabellate in form, branches pinnate 

 and nearly opposite; stem and branches fascicled, with a tube running along the anterior surface; 

 hydrocladia springing from stout processes from this tube, and each process bearing a short, 

 seemingly stunted hydrotheca in its axil; hydrocladia alternate, divided regularly into hydrothe- 

 cate interuodes. Hydrotheca^ deep, cup-shaped, with entire and slightly everted margins, 

 borne on the distal portions of the iuteruodes, the posterior side of each hydrotheca being free 

 from the internode for about two-thirds the height of the former. On the anterior side of each 

 hydrotheca there springs from the iuternode a curved nematophorous branch, composed of three 

 or more joints, besides the long, strong process of the internode with which they are continuous, 

 the whole branch curving slightly over the hydrotheca, being four or five times as long as the 

 latter aud haviug a uematophore on each of the joints; supracalyeine nematophores springing 

 from near the bottom of the hydrotheca; a pair of nematophores on the process supporting the 

 nematophorous branch, another pair on the distal portion of each internode; a mesial nematophore 

 at the base of each uematophorous process, aud numerous cauline uematophores scattered over 

 the stem and branches. 



1 Named in honor of uiy revered friend aud teacher, Doctor Samuel Calvin, of the State University of Iowa. 



