ZOOPHYTOLOGY, 311 



contracted below into a tube, and that the branches are given 

 off more irregularly, and not from the sides of the cells, but 

 from the upper and back part of the cell from which they 

 spring. 



1. A. Alderi, n. sp. Busk. PI. IX., figs. 6, 7. 

 Cells ovate broad, surface punctate, verrucose round the border ; an 

 umbo in front. Mouth circular with a sinus in the lower border, margin 

 very slightly thickened. Ovicell globose, keeled in front, with a small 

 central umbo. 



3 Gen. Eschara, Ray. (' Brit. Mus. Cat.' p. 89.) 

 * Foliaceous. 

 1. E. crihraria, Johnston. PI. X., figs. 7, 9. 

 Cells punctured, oval or rhomboidal, the aperture in the mature one 

 with a blunt mucro below ; an avicularium on each side of the mouth. 

 Mouth orbicular, margin simple, thin. 



Hab. Berwick Bay, 35 fms, Dr. Johnston ; Coast of Northumberland, 

 deep water, A. Hancock, W. King, J. Alder. 



The beautiful Eschara here figured, appears to correspond 

 so closely with Dr. Johnston's description of E. crihraria, that 

 there would appear to be little doubt of its really being the 

 form understood by him under that appellation. His figures, 

 however, are bad, and seem to have been taken from an old or 

 worn specimen, and it is not easy to reconcile them with his 

 verbal account. 



The species was first brought to my notice by Mr. J. Alder, 

 who kindly furnished me with the two smaller specimens 

 figured in the plate, and, at the same time, was good enough to 

 supply outline figures of the larger growths there shown. He 

 informs me that several specimens of it exist in the Newcastle 

 Museum, where they were placed by Mr. King, and labelled 

 E. foliacea ; he states, also, that Mr. A. Hancock obtained it, 

 many years ago, by dredging in deep water. The mode of 

 growth of the young polyzoary is remarkable. It clasps, by a 

 contracted base, the branch or branches of a Sertulai-ia or 

 Fucus, and the two planes of cells turn round the support, and 

 apply themselves back to back. This mode of origin, however, 

 is not altogether peculiar ; for it obtains in more than one other 

 species of Eschara, an instance of which may be seen in M. 

 Edwards, Sur les Eschar es, PI. IH., fig. 1 d, in the case, un- 

 doubtedly, of E foliacea. 



2. Folyzoa, cyclostomata. 

 Gen. 1. Alecto, Lamx. 

 1. A. gramdata ? W. Thompson. PI. IX., figs. 1, 2. 



The figure is taken from a drawing by Mr. J. Alder of a specimen 

 apparently of the above species, exhibiting a peculiar mode of growth, 

 growing on a stone from Shetland. It bears a close resemblance to 

 Alysidota. 



