Poly zoa of Queen Charlotte Islands. 11 



cesses are described as arising from " one side of the cell." 

 This species is also furnished with a strong vibraculoid spine 

 below the area, and seems to be destitute of avicularia. The 

 present form is certainly distinct from all the above. 



Membranipora cornicullfera^ n. sp. (PL XX. figs. 4, 4a.) 



Zocecia ovate, much narrowed towards the oral extremity, 

 expanded below, distinct ; margin rather thick, granulated ; 

 area occupying the whole of the front of the cell, with a mem- 

 branous covering ; from six to nine tall, stout, erect spines round 

 the upper part of the cell ; below them about four on each side, 

 bent inward over the area, of which the uppermost pair are 

 the stoutest, the rest being extremely slender and acuminate ; 

 two or three very long and much attenuated spinous processes 

 springing from the wall of the cell at the top, behind the mar- 

 ginal spines ; oral valve large, filling the narrow neck-like 

 extremity of the cell above ; on the outer surface of the side 

 wall, a little below the top, a minute aviculan'um (PI. XX. 

 fig. 4 a), with a pointed mandible directed outwards. Ooe- 

 ciuni small, rounded, smooth, with a horn-like process pro- 

 jecting from the centre of the oral margin. 



Loc. Cumshewa, on shell. 



This species is remarkable for its wonderful array of spines. 

 The position of the avicularium on the outer surface of the 

 cell below the margin is also peculiar. 



Memhranipora minuscula^ n. sp. (PI. XX. figs. 3, 3 a.) 



Zocecia small, oval, arranged in quincunx (somewhat irre- 

 gularly) ; margin a good deal raised, thin, smooth, no spines ; 

 on an oblong area, placed above the cell, occasionally a small 

 circular avicularium, slightly raised, the mandible directed 

 upwards. Occcium semicircular, shallow, just covering the 

 extremity of the cell, smooth, with a subcircular membranous 

 space at the back (? avicularian). Zoarium forming a thin 

 flat crust, usually of small size. 



Loc. Houston Stewart Channel, &c., common. 



Memhranipora membranacea, Linneeus. 



Queen Charlotte Islands, incrusting the stem of a sea-weed. 



The only specimen that occurs is covered with numerous 

 tall, very stout, membranous processes, which occupy the place 

 of one of the spines at the top of the zooecium. They are 

 smooth and glossy, narrow at the base, somewhat enlarged 

 about the middle, and taper off" to a point above. They are 

 no doubt modified spines ; but we have no clue to their his- 



