THE PLUMULARID.E. 85 



Gonosome. Gonangia borne on tbe distal portions of the main stem and branches, where they 

 are protected by a series of whorls of nematophorous branchlets, there being six branchlets to 

 each whorl, and seventeen whorls in the specimen figured. The gonophores are quite small, 

 orbicular, and spring from the axils of the protective branchlets. 



Distribution. 7>'//.r Station L'liO; off St. Vincent; depth, 124 fathoms. 



There is no doubt in my mind that Doctor Fewkes was in error when he identified this specimen 

 as Hippun'lht nnnnliitu Al'.man. Through the kindness of Doctor Walter Faxon I have been per- 

 mitted to examine and sketch the specimen, which differs greatly from II. annulata in size of 

 colony and of hydrotheca', shape and approximation of hydrothecse, arrangement and septal ridges 

 of the hydrocladial internodes, and particularly in the gonosome. 



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



CALLICARPA Fewkes. 

 CalUmrpa FKWKES, Bull. Mus. Comp. Zool., 1881, VIII, Xo. 7, p. 134. 



Troplto&nmr. Stem not fascicled, bearing alternate hydrocladia arranged in a pinnate manner. 



Gonosome. Gonangia borne on special branches springing from the front of the main stem, 

 and protected by nematophorous branchlets arranged in verticils, the whole having a resemblance 

 to a spike of wheat. 



This very remarkable form of gouosome differs greatly from any other yet found among the 

 Eleutheroplea, being one of the most elaborate structures for the protection of the reproductive 

 bodies found in that section of the Flumularida-. While it bears some superficial resemblance to 

 the corbulo? of Agluopheiriii, the fundamental structure is widely different. It is as Doctor Fewkes 

 says: "Morphologically speaking, as if the proximal part of the branch which bears pinna' in 

 HippureUa was reduced to a peduncle, and the distal end with its verticillate ribs became the 

 gonosome." 



The trophosome of the only known species of this interesting genus resembles greatly that 

 of the well-known riinnitlnrin. 



CALLICARPA GRACILIS Fewkes. 



(Plate XVII, figs. 1-6.) 

 Callicarpa gracilis FEWKKS, Bull. Mus. romp. /.on].. 1SSI, VIII, No. 7, p. 134. 



Trophosome.i Colony unbrauched, but with what appears to be a stump of a single branch, 

 attaining a height of about G inches; stem fascicled, with a central hydrocladia-bearing tube sur- 

 rounded by numerous accessory tubes; distal portion not fascicled and not divided into regular 

 internodes; hydrocladia alternate, not very closely approximated, divided into iuteruodes by 

 inconspicuous nodes, and with a slight constriction or partial anuulation on the anterior face near 

 each node; there are no intermediate internodes. Hydrothec;e deep, cylindrical, with the anterior 

 profile nearly straight, aperture horizontal; supracalycine nematophores large, trumpet-shaped, 

 growing from small processes on a level with the top of the hydrotheca; mesial nematophore 

 borne on a small protuberance at the proximal end of the internode. 



GonoKoiitc.Gon&ugia, borne on a specialized branch which bears no hydrocladia, but consists 

 of a central stem or axis bearing a series of verticillate branchlets, each of which terminates in 

 four slender processes, each bearing a row of free nematophores on its inner side. There are 

 three of these branchlets to each verticil. The gonangia grow in the axils of the branchlets. 



Distribution. Unknown. Label lost. It was found among the material brought home by the 

 lilnkc and belongs doubtless to the West Indian fauna. 



The gonosome of this remarkable species is the most elaborate and highly specialized found 

 among the Eleutheroplea, It seems that the whole affair is a modified branch, and it is probable 

 that each branchlet, or phylactocarp, is a modified hydrocladium, although such hotnologies are 

 necessarily obscure and far from satisfactory. 



The description is I'rom Doctor Fewkes's typi j specimen. 



