MUSEUM OF COMPARATIVE ZOOLOGY, 241 
Eudendrium distichum sp. ۰ 
Plate I. Figs. 4 - ۰ 
Trophosome. — Hydrocaulus attaining a height of four to five inches, rooted by 
a creeping hydrorhiza, much branched, strongly curved, nearly the same thickness 
throughout, black at the base, passing through various shades of horn-color to 
white or a delicate yellowish-white at the distal end, annulated at the base and 
just above the origin of each branch ; branches arranged alternately in a dis- 
tichous manner, springing from the upper side of the stem, arched, with the 
convex sides towards the upper surface annulated above the origin of each 
ultimate ramulus. Ultimate ramuli short, with a peculiar bend in the proxi- 
mal end which makes the proximal portion of the ramulus more or less parallel 
with the branch from which it originates, annulated at the base ; the annulated 
part usually smaller than the rest of the ramulus. Hydranths large, with from 
sixteen to twenty tentacles, 
Gonosome, — Unknown. 
Locality. — Ten miles north of Zoblos Island. 
Owing to the curved stem and branches and the freedom from all encrusting 
growths, this species is a very graceful, elegant one. From the regular dis- 
tichous arrangement of the branches throughout the entire colony, it has the gen- 
eral appearance of a Pennaria. From all species of that genus it may of course 
be readily distinguished by a glance at the hydranths. From Æ. ramosum 
Linnzous, it is separated by the arrangement of the branches and by the general 
habit. 
Tubularia sp. 
The stems of a tubularian occur from two localities, — one from Yucatan ; the 
other from a depth of 101 fathoms in Lat. 25° 33! N., Long. 84° 91 W. 
Obelia marginata ALLMAN. 
A number of very fine specimens of this elegant species, forming a thick 
cluster of stems much overgrown and matted together near the base by encrust- 
ing bryozoa, ascidians, annelid-tubes, together with barnacles and lamelli- 
branchs. 
Creeping over some of the stems were found specimens of Lafoéa venusta 
Allman. This is the same species and as yet the only habitat on which this 
beautiful Lafova has as yet been found. 
Locality. — Ten miles north of Zoblos Island, 
Obelia hyalina sp. nov. 
Plate IV. Fig. 21. 
Trophosome. —Hydrocaulus springing from a creeping hydrorhiza, attaining 
a height of half an inch, but little branched, annulated at the base, divided 
into internodes of equal lengths, each one of which is annulated at its proximal 
end and bears on a short process from its distal end a pedunculated hydro- 
