52 Prof. AUman on the Hydroid Zoophytes. 



is naked is a small portion of the body just behind the mouth, 

 and the terminal portion of the tentacles, which, when these are 

 in the extended state, comprises a space of somewhat less than two- 

 thirds of their entire length, — a character of true generic value. 

 At the origin of the polypiferous ramuli, the polypary is marked 

 by distinct spiral corrugations. 



The gonophores belong to the class which contain sporosacs, 

 and not Medusse. They are borne each upon the summit of a 

 short lateral branch, three or four of which are situated alter- 

 nately along the entire length of the ultimate ramuli, and have 

 their investing polypary marked by spiral corrugations. The 

 polypary is continued over the entire gonophore. Each gonophore 

 contains a single sporosac with a ramified spadix*. 



I have not been able to find any description of the present 

 animal, though Dr. S. Wright informed me last year that he 

 had met with a Tubularian zoophyte in which the greater part 

 of the polype was covered by the polypary. If it really prove 

 to be an undescribed form, I would propose for it the name 

 of Manicella-\ fusca, which is sufficiently expressive of some of 

 its more striking characters. 



IV. Eudendrium hacciferumy nov. sp. 



Growing upon the basalt of some of the small rocky islands 

 of the Firth of Forth, or attached to other zoophytes or to sea- 

 weeds, there may be found near low-water mark a small Tubula- 

 rian zoophyte, which also presents a form which may prove of 

 generic value, but at all events is one of well-marked specific 

 distinctness from any with which I am acquainted. 



It attains a height of about an inch. It is much and irregu- 

 larly branched, though the ultimate or polypiferous ramuli pre- 

 sent for the most part a pinnate arrangement. The main stem 

 is thickest near the root, and is here distinctly composed of 

 aggregated tubes. It becomes gradually attenuated as it gives 

 off its branches, and finally, like the branches, consists of a 

 simple tube. 



The ultimate ramuli are for the most part abruptly bent to 

 one side, a little behind their terminal polypes, — a character which 

 gives a special and rather peculiar aspect to the zoophyte. 



The polypary is slightly corrugated on the branches, without 

 being anywhere distinctly annulated, and is continued over the 



* The endodermal portion of the manubrium, from which the genera- 

 tive elements directly originate. 



t A diminutive noun, from manica, the long Roman sleeve which per- 

 formed the office of a glove ; the allusion is to the extension of the poly- 

 pary over the body and tentacles of the polype. 



