33S EUDENDRIUM ANNULATUM. 



*^* 6. EuDENDEiUM DISPAE, Agassk. 



EuDENDRiUM iiisPAR, — Affossiz, CoTitr. Nat. Hist. U. S., vol. iv, p. 285, pi. xxvii. A/e.v. 

 Ai/assiz, Illustr. Catal. of North American Acalophre, p. 159. 



TROPHOSOME. — Htdrocaulus irregularly branched, slender and flexile, attain- 

 ing a lieiglit of about two inclies ; perisakc ringed throughout. Hydrantii with 

 twenty-eight tentacles. 



GONOSOME. — Male sporosacs two- or three -chambered, springing from the 

 body of the hydranth in an irregular verticil just below the tentacles. Eemale sporo- 

 SAcs globular, scattered over the body of the hydranth and the distal portion of the 

 stem. 



Development of Gonosome. — ]\Iay to September. 

 Bathymetrical distribution. — Deep-sea zone. 

 Locality. — Shores of Massachusetts, Agassiz. 



The diagnosis here given is derived from Agassiz's description of the species. In this 

 description, however, the author seems chiefly to have had in view its distinctive points when 

 compared with Boiigainvillia, so tliat generic rather than specific characters are for the most part 

 referred to, and it is by no means easy to find characters available for a technical specific diagnosis. 

 Those selected above, however, will, I think, be sufficient to secure the American Eudendriiim 

 from being confounded with any of the other species of the present Monograph. 



The same species is referred to by Alexander Agassiz in his ' Illustrated Catalogue of North 

 American Acalepha;,' where he tells us that " the male and female conniuuiities are readily recog- 

 nised by the different colour of the medusa-buds (sporosacs), the male medusa-buds being of a 

 bright orange, while the female are of a dull pink." 



No mention is made of the atrophy of the gonophore-beaiing hydranths, so common in 

 other species. 



7. EUDENDRIUM ANNULATUM, Normail. 



EuDENDRiuM ANNULATUM, — Normaii, iu Ann. Nat. Hist, for January, 1864, pi. ix, figs. 1 — 3. 



Hincks, Brit. Ilydr. Zoopli., p. 83, pi. xv, fig. 1. 



TROPHOSOME. — Hydrocaulus shrubby, attaining a height of about four inches, 



