150 Rev. T. Hincks's Contributions towards 



neither seta nor spinule. In a curious form from Madagascar 

 the edges of the narrow segments into which the zoarium 

 divides are fringed by very tall and slender setee, frequently 

 placed in pairs, whilst there is also a profusion of the suboral 

 appendages. This form presents a very marked contrast to the 

 extremely simple and elegant variety {hicornis) from Ceylon. 

 The same variability in the spinous armature is characteristic 

 of M. pilosa. 



h. With a calcareous lamina. 



Memhranipo7'a patula, n. sp. 

 (PI. IX. tig. 4.) 



Zocecia short, narrowed above and broadly expanded below, 

 the upper extremity of the cell much raised, the lower de- 

 pressed ; margin well raised, narrow, sharp, minutely granu- 

 lated ; aperture arched above, the lower margin slightly 

 curved outwards, occupying fully three fourths of the length of 

 the area, the lower fourth filled in by a strongly granu- 

 lated, calcareous lamina, which is continued for a short dis- 

 tance up each side; on the upper margin four very stout 

 cylindrical spines, two towards each side, which are articu- 

 lated by corneous joints ; projecting from the centre of the 

 back of the cell, some way below tlie margin, an avicularium 

 with pointed mandible, directed straight outwards. Ooecium (?) . 



Loc. California {Afiss Jelly). 



Memh'anipora setigera^ n. sp. 

 (PL VIII. fig. 3.) 



Zooecia large, ovate ; area occupying the whole front of the 

 cell, the lower two thirds covered in by a shining calcareous 

 lamina, minutely pitted over ; aperture arched above, lower 

 margin straight, closed by a rather stout membranous wall, at 

 the upper extremity of which is the orifice ; margin not much 

 raised, granulated ; a row of 6-8 tall spines surrounding the 

 upper extremity of the area. Avicularia none. Ooecium ('?). 



Loc. Australia, investing Berpula {Miss Gatty). 



This species belongs to the same section of the genus as 

 our British M. Rosselii and M. trifolium. Its spines are a 

 conspicuous character, the zoarium literally bristling with them. 

 The surface is flat and somewhat glistening. 



Memhranipora spinosa^ Qioy & Gaimard. 



Flustra spinosa, Q. & G., Voy. de I'Astrolabe. 



Membranipora ciliata, MacGillivray, Trans. Roy. Soc. Victoria, 1868. 



Membranipora spinosa, Busk, Polyzoa of Kerguelen Island. 



Busk identifies a form from Kerguelen Island with the 



