60 ME. ALDER ON NEW POLXZOA. 



margin of the disk. The horns of the semicircle of tentacles 

 point outwards. 



The lithocysts are eight in number, one of which is situated 

 a short distance within the margin of each of the central sinuses 

 of the greater lobes. 



The oral appendages are greatly developed and assume the 

 form of four large many-folded ochreous yellow curtains, exqui- 

 sitely margined with a short and finely cut fringe. The length 

 of the curtains is somewhat greater than their united breadth, as 

 they hang suspended beneath the hydrosoma. 



The ovaries are dull reddish brown. 



The Cyanea here described is preserved in fluid in the Museum 

 of the Natural History Society of Northumberland, Durham, 

 and Newcastle-on-Tyne. 



III. — Descriptions of three new or imperfectly known JPolyzoa, 

 found on the Coasts of Northumberland and Durham. By Joshua 

 Alder. (Plate YIII.) 



The descriptions of the following species of Polyzoa are extracted 

 from a paper read at the meeting of the British Association in 

 Newcastle, and afterwards published in the ' ' Journal of Micro- 

 scopical Science." They have been considered of sufficient local 

 interest to admit of their introduction here. 



Pah. ESCHAEIDiE, Bush. 



Eschara Landsborovlt, Johnston. PI. YIII, figs. 1-3. 



Polyzoary consisting of very thin and delicate foliaceous plates, 

 anastomosing irregularly, and undulating on the upper margin, 

 which is a little expanded. Cells in longitudinal rows, placed 

 alternately or in quincunx. They are oblong, thin, and per- 

 forated with large punctures. Apertures with the margin slightly 

 raised, nearly circular above, and produced into a point below, 

 where there is a small, slightly prominent, circular avicularium, 



