EscHARA. Z. ASCIDIOIDA. 297 



is very distinct from the R. celiulosa, with which it has been con- 

 founded." Fleming. 



2. R. CELLULOSA, polypidom reticulated^ umbilicate , Junnel- 

 shaped, tvavt/, celluliferous on the inner side ; the pedicle short, 

 subtubular. Ellis. 



Vignette No. 46, page 283. 

 Retepora eschara marina, Fer. Imperat. Hist. Nat. 630, c. fig. Ellis, Corall. 



72, pi. 25, fig. d, D, F. Millepora retepora. Pall Elench. 243. 



M. celhilosa, Lin. Syst. 1284. Turt. Gmel. iv- 637. Turt. Brit. Faun. 

 205. Jameson in Wern. Mem. i. 560. Steiv. Elem. ii. 427. Bosc, 

 Vers, ii. 34-3, pi. 25, fig. 5. Cavol. Polyp, mar. 73, tav. 3, fig. 12-14. 



Blumenb. Man. 270 M. foraminosa, Fllis and Soland. Zooph. 138. 



pi. 26, fig. 2 Retepora celiulosa, Lam. Anim. s. Vert. ii. 182. 2de 



edit. ii. 276. Stark, Elem. ii. 435. Risso, L'Europ. Merid. v. 343. 



Johnston in Mag. Nat. Hist. vii. 6-38, fig. 69 La Retepore dentelle 



de mer, Blainv. Actinolog. 433, pi. 76, fig- I . 



Hub. Deep water, rare. Shetland islands, and in the island of 

 Fulah, Jameson. Scarboroug-h, Mr Bean. 



Polypidom about an inch in height, affixed by a hollow, thick, and 

 A'ery short stalk, which expands into a shallow cup with unequal wav- 

 ed and sinuous margins ; pure white, calcareous and beautifully reti- 

 culated, the meshes about a line in length, oval, subequal, regular 

 and divided by celluliferous spaces, rather wider than their own short- 

 est diameter ; the cells immersed, quincuncial, leaning, with the 

 apertures looking upwards, a little prominent, round, with a small 

 tooth on the distal edge ; they open only on the superior or inner 

 aspect, for the under surface of the polypidom is imperforate and al- 

 most smooth. 



39. Eschara,* Ray. 

 Character. — Polypidom membrano-calcareous, inflexible, 

 brittle, expandimj in the form of foliaceous porous lamellce, vari- 

 ously folded and anastomosiny, and consistiny oftioo layers of op- 

 posite cells : cells immersed, coalescent, horizontal to the plane of 

 axis, openiny on both surfaces in quincuncial pores protected with 

 an opercidum. — Polypes ascidian. 



1. E. FOLIAGE A, plates foliaceous, ivindiny, unitiny irreyu- 

 larly andforminy sinuous cavities. Dillenius. 



Plate xl. 



* Ey;(;aga, the scar from a burn. 



