MR. ALDER ON NEW POLYZOA. 61 



behind which is a truncated denticle. Ovicells prominent, glo- 

 bose, "or ovate, silvery and perforated, produced below into a 

 raised margin surrounding the mouth of the cell, and giving it a 

 triangular form. A rather large, spatulate avicularium is seen 

 in some cells, placed transversely by the side of an ovicell, and 

 raised a little from the surface (fig. 3). The two layers of cells 

 are separable. Height two inches ; breadth about two and a 

 half inches. 



Lepralia Landsborovii, Johns., Brit. Zooph., p. 310, T. 54, 

 fig. 9 ; Busk, Catal., p. 66, T. 86, fig. 1, and T. 102, 

 fig. 1 ; Hincks, in Jour. Micros. Sc, Yol. VIII, p. 277 

 (young state). 



Escho/ra foliacea, Alder, in Trans. Tynes. Club, Vol. Ill, 

 p. 151. 



This delicate and fragile species was obtained some time ago 

 on the north coast of Northumberland, by Mr. Embleton, of 

 Beadnel Cottage, but was passed over at the time of the publica- 

 tion of my " Catalogue of the Zoophytes of Northumberland and 

 Durham," as a variety of E. foliacea. A second and more care- 

 ful examination, however, convinced me that it was a distinct 

 and very characteristic species, hitherto undescribed as an Eschara, 

 but not entirely unknown to science, as the L. Landsborovii of 

 Johnston turns out to be an encrusting form of this species, 

 which has not until now been seen in its perfect state. Mr. Bean, 

 however, has lately sent me a small specimen for examination, 

 got at Scarborough, in which a double layer of cells rises to about 

 an inch in height ; and Mr. Norman has dredged a variety of this 

 species in Guernsey, consisting of a single layer, assuming the 

 form of a hollow cylinder, with the edges slightly appressed at 

 their junction. Mr. Hincks has also met with similar examples. 

 It is rather singular that on this coast, where for the first time 

 the species has been found in its perfect state, the Lepralian or 

 rudimentary form is unknown. In its intermediate state this 

 species has all the characters of the genus Hemeschara of Busk. 

 At present, I am inclined to consider that genus as only a 



