340 ZOOPHYTES. 



Though not thick the texture is very firm and compact, as in the 

 other Mycedia?. The ridges are formed by the more or less perfect 

 confluence of deep unequal cells in transverse or concentric series ; 

 they are irregular, but have a neatly striate surface. The cells are 

 one and a half to two lines wide at top. 



Mad. cucullata, Ellis and Sol., 157, tab. 42. , Lamour. Exp. 54. tab. 42 ; Encyc. 



, Esper, Fortsetz. i. tab. 67 ; from 12, pi. 484. 



Ellis. , Blain., Man. 360, pi. 56, fig. 3 ; bad. 



Agaricia cucullata,, Lamk. ii. 380 ; No. 1. Mycedium cucullatum, Oken, Zool. i. 69. 



7. A. MYCEDIA PURPUREA. (Lesueur.) 



A. foliacea, unifrons, pkrumque incrustans ; supra concava, undulata ; 

 cellis profundis, nunc in sukis irregularibus seriatis, nunc aggregatis, 

 itaque super fide irregulariter aut reticulate cotticulatd ; polypis obso- 

 lete tentaculatis, labris luteolis, discis luteo-radiatis. CoraUum mar- 

 gine acutum ; subtus, subtiliter striatum et concentrice undulatum. 



Foliaceous, unifacial, for the most part incrusting, concave above and 

 undulate, with deep cells arranged either in series or irregularly 

 grouped, and the surface therefore irregularly or reticulately colli- 

 culate; polyps with the tentacles obsolete; lip yellowish, and disks 

 with yellow rays. Corallum with the margin acute; below finely 

 striate and concentrically undulate. 



St. Thomas, West Indies. Lesueur. 



Lesueur describes this species as growing to a breadth of eight or 

 twelve inches, incrusting whatever may be in its way. It is near the 

 cucullata, but appears from this character to be distinct. According to 

 the figure the cells are one and a half to two lines broad, and less 

 frequently seriate than in the cucullata. The tentacles are described 

 as replaced by mere expansions of the membrane. The mouth is 

 oblong plicate within, and bordered by a circle of pale yellow, and 

 exterior to this circle there are eight yellow points, from which proceed 

 radii of a pale yellow colour, with two or three others much fainter, 

 between the more distinct. The general colour is purple, passing into 

 sienna-brown near the border of each polyp. 



Agaricia, purpurea, Lesueur, Mem. du Mus. vi. 276, pi. 15, figs. 3, a, b, c. 



