MUSEUM OF COMPARATIVE ZOOLOGY. 241 



Eudendrium distichum sp. nov. 



Plate I. Flsrs. 4-6. 



Trophosome. — Hydrocaulus attaining a hofght of four to five inches, rooted by 

 a creeping hydrorbiza,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 

 gro\vths, this species is a very graceful, elegant one. Fi-om 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 E. ramosuni 

 Liimaeus, 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° 21' 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 Lafoea vemista 

 Allman. This is the same species and as yet the only habitat on which this 

 beautiful Lafoea has as yet been found. 



Localitij. — 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- 



